JP2007029840A - Low exhaust spray apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized coating chamber in which the quantity of conditioning air sucked to the coating chamber and discharged to the outside is reduced, coating is carried out in a industrially profitable manner with small quantity of exhaust gas in the view point of environmental protection and particularly a large sized material to be coated is coated with low eshaust. <P>SOLUTION: The coating chamber provided with an exhaust apparatus and a coating robot carrying out repeating work by a working signal previously stored and set are integrated as a coating unit. The coating unit is reciprocally moved by a movement means controllable so as to reach a coating position required for the material-to-be-coated passed through the coating chamber. A control means is linked with the working control of the coating robot by a servo-actuator or the like to carry out the coating in a limited area to make the coating possible in the small sized coating chamber following the coating position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention makes it possible to reduce the size of the painting chamber that collects scattered paint mist by spraying, especially when painting automatically by a painting robot, etc. It is about technology to plan.

The painting room, especially the spray painting room, sucks and collects the paint mist that has not adhered to the object to be painted due to spraying, avoids unnecessary reattachment to the object to be painted, and maintains the work environment. This equipment is indispensable to prevent the discharge of harmful substances that adversely affect the surrounding environment including paint mist. Many of these painting rooms communicate with the factory building, which is a work place, and have a structure in which the air in the room is always sucked and exhausted. Therefore, even the air-conditioned air in the working chamber connected to the coating chamber is exhausted for exhausting the paint mist after being sucked and collected, resulting in a huge energy loss.

Normally, the air current in the painting area is flown at a speed of 20 cm to 1 m per second, and if there is a frontage of 10 square meters, air conditioning air of several hundred cubic meters per minute will be discharged to the outside, which is a major problem. Yes. As a countermeasure for this, a method of circulating and introducing air after mist processing to reduce substantial exhaust, fresh air separate from air-conditioned indoor air, mainly external air, is filtered into the painting chamber A method of forcibly supplying air purified by the above to reduce loss of conditioned air is mainly used.

Air conditioning in the painting room is an unavoidable problem in terms of maintaining a healthy environment as well as with workers. It is almost always set under close conditions, but rather it is clear that it is always necessary to maintain a constant temperature and humidity environment in order to stabilize the coating quality and not cause defective coating. In particular, stabilization of the coating conditions is an absolute requirement for the coating of precision equipment represented by recent electronic information equipment, and one of the basic conditions is indoor air conditioning.

On the other hand, an object to be coated is installed in the painting room and is painted by a painting machine, but is sprayed by being directed to the painted portion of the object by a painting means such as a painting robot or an automatic painting apparatus as well as an operator. Therefore, it is common to prepare a coating chamber having a size corresponding to the object to be coated. A larger coating chamber is set as a large object is to be coated. For this reason, as a matter of course, the size of the equipment for installation is naturally increased, and the loss of air-conditioning energy due to the above-described exhaust gas increases proportionally.

As a means of reducing the exhaust amount, a method of reusing the circulation and a method of reducing the absolute amount of the exhaust amount are considered, but the former needs to sufficiently treat the exhaust air and supply the purified air. Therefore, a very large facility is required. In other words, what is acceptable for normal exhaust must be treated to a level below a lean odor level, and must be cleaned so that it does not affect the human body or painting even if it is returned to the painting room again. The current situation is that it is a heavy burden and is not a sufficient measure. In this situation, the method of forcibly supplying the air introduced into the painting room with fresh air different from the air-conditioned room air is the same.

In addition, as a method of reducing the absolute amount of exhausted air, it is conceivable to reduce the frontage of the coating room, but the size of the frontage for the object to be coated needs to have a margin for ease of work. Yes, especially when precise and complicated painting such as complicated and complicated shapes, uniform painting to the inside, back or corners are required, spray must be sprayed from various directions. Along with this, a wide range of spraying toward the coating chamber is required, so there is a limit to the size limitation.

On the other hand, for very large objects to be painted, such as painting of railway vehicles, a mobile painting facility is arranged on the side of the vehicle placed on the rail, and an exhaust treatment device for spray mist is attached to this painting device. There is used a device that locally sucks overspray mist that scatters to the surroundings while changing the position relative to the vehicle and performs coating to prevent scattering to the surroundings and paint mist processing. (Japanese Patent Publication No.49-44104)

Such a device is manufactured as a device dedicated to a specific object to be coated, and can form a frame of the coating apparatus along the shape of the object to be coated, that is, a wall surface corresponding to a coating chamber, thereby preventing unnecessary intake air. However, if the object to be coated is changed, the processing efficiency of the paint mist will be reduced along with the wasteful intake air, and it cannot be used practically, so it can not be used as a general-purpose painting device or exhaust treatment device that changes the object to be coated. It has become a technology.

Most industrial coatings aim to perform more efficient and high-quality coatings in a situation where the objects to be coated are diversified. Development is progressing as an optimal device to satisfy. Along with this, the exhaust gas treatment equipment used for painting is generally installed as a painting room with a size that can sufficiently tolerate the operating range of the painting robot, regardless of the size of the object to be painted. is there. Therefore, there is a problem that a small object is wasteful and cannot be applied to a large object.
Japanese Patent Publication No.49-44104 JP-A-6-091210 JP 2000-93874 A

In the painting operation, if it is limited to the sprayed area, regardless of the size of the object to be coated, the spraying conditions do not vary greatly depending on the coating machine used, and the treatment of overspray mist caused by painting does not change greatly. However, in actual spray mist processing, the exhaust treatment device attached to the painting chamber is compatible with the entire painting chamber, and there is a lot of waste such as always performing exhaust treatment outside the required area, and more intake air than necessary. As a result, exhaust gas containing paint mist is treated. Therefore, the first problem is to obtain a coating chamber that is economically economical and can be used with a small displacement from the viewpoint of environmental conservation.

As a painting that enables painting with a small displacement, it is easy to reduce the size, but in a normal painting room, it is not possible to cope with a large-sized object. For this reason, it is an incidental problem to obtain a coating chamber capable of supplying clean air by applying a spray mist process to the coating chamber itself while being small in size.

In addition, the necessary exhaust processing means is arranged in the necessary coating area, and a system that can perform the appropriate processing with the minimum required exhaust volume is constructed, responding to changes in the object to be coated, especially Compared to the conventional painting room and incidental painting equipment for large-scale objects, the installation area can be greatly reduced, the painting cost can be reduced by reducing the displacement, and the effect of preventing pollution of the surrounding environment can be improved. It is the subject of the present invention.

In order to solve the above-described problems, the present invention integrally integrates a painting chamber in which an exhaust device is provided at the rear and a painting machine is disposed in front, and a painting robot that repeatedly operates in accordance with an operation signal stored in advance. Configured as a painting unit. Furthermore, the painting unit can be moved by means capable of controlling the relative position of the painting unit so that the painting robot and the painting room are properly positioned in a necessary painting area for the object passing through the painting room. It is a thing.

The position of the painting unit can be moved on the rail by a reciprocating traveling device, and the movement control is set to be a required position in conjunction with the operation control signal of the painting robot and stored in the control device.
In order to accurately control the position, the reciprocating traveling device can obtain a sufficient effect by using an actuator such as a servo motor.

Further, as an effective means for reducing the amount of exhaust from the painting chamber, it is possible to limit the opening on the front surface of the painting chamber to the operating area of the arm of the painting robot on which the painting machine is mounted. Further, an effect can be obtained by installing an air supply chamber in the opening on the front surface of the coating chamber so as to prevent the air conditioned air in the workplace where the coating unit is installed from being unnecessarily sucked and exhausted.

As an incidental facility effect of the present invention, the coating units are arranged so as to be opposite to each other so that the respective coating robots are located on both sides of a relatively large object to be coated. By painting both sides of the object with separate miniaturized coating units, it is possible to reduce the coating chamber area and simplify the entire equipment.

As described above, according to the present invention, it is not necessary to increase the size of the painting chamber even for a large object to be coated, and the exhaust treatment function in the necessary painting work area can be sufficiently performed. By reducing the size of the chamber, the amount of exhaust in the paint mist exhaust process can be greatly reduced. Therefore, the air-conditioned air in the working room can be suppressed with a minimum amount of exhaust, and the air-conditioning cost of the workplace can be greatly reduced. In addition, since the absolute amount of exhaust is reduced, the treatment of gas containing paint mist is also efficient, and the absolute amount of pollutants discharged is reduced, which has a positive effect on the environment.

The above effect is that the painting room is small with respect to the object to be painted, but moves together with the painting robot including the painting machine in conjunction with the painting position of the object to be painted, so that the painting room always corresponds to the required position. It will be obtained by being able to. Normally, robot painting on an object to be painted progresses while changing the position of the object to be painted by instructing the painting work in advance, but according to the present invention, the position of the painting chamber is also changed in conjunction with the painting robot. Since the work progresses, the painting chamber can be downsized.

If the painting chamber can be reciprocated in accordance with the movement of the painting robot, the opening of the painting chamber is smaller and an opening that sufficiently allows the arm operating range is sufficient. Therefore, the effect of the present invention can be brought out by selecting the most efficient opening in consideration of the possible operation of the painting robot, the range of the object to be coated, and the painting conditions. The movement control of the painting chamber does not need to be completely linked to the operation of the painting robot, and even if it is stopped within a limited range, a sufficient effect can be obtained, and the load can be reduced by simplifying the movement of the painting chamber, Can balance the operation. These controls are possible by setting the input to the control device of the painting robot.

In addition, by installing multiple painting units of the present invention and separately painting both sides of a large-sized object, it can be moved along the conveyor line without rotating the object. Full painting is possible. In this way, in the case of a large object, particularly in the case of a long and thin object to be painted, the painting area can be simplified and the area can be greatly reduced, and a great effect can be obtained from the aspect of equipment facilities.

Details of the case of carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows a coating state on a relatively large object to be coated that is suspended and conveyed on a conveyor line using the coating chamber according to the embodiment. The painting chamber 1 is provided with an exhaust device having a mist processing means at the rear, and an automatic painting device such as a painting robot 2 is integrated on the side surface to constitute a painting unit 3. In the example of FIG. 1, the arm 22 attached to the vertical shaft 21 extends and is controlled to move up and down and rotate, and the mounted spray gun 24 can be freely moved by swinging the joint portion 23 and the tip of the arm 22. In the moving configuration, a necessary motion is stored by a separately installed control device, and the painting operation is repeatedly performed based on a set program. Various devices can be selected according to the application.

The painting unit 3 is placed on a carriage and moves on the rail 4 left and right. Although not shown, the moving means is configured to be capable of position control by a servo actuator, and the control is interlocked by the control device of the painting robot 2 to move to a set position. In general, control by a servo motor or the like is used. However, depending on the accuracy, speed, and movement range of the position control required by the object to be coated, there is an existing drive, such as using air drive as a drive source. Selection according to the specifications required in the range of control drive technology is possible.

The object A to be coated passes through the coating chamber 1 through the entrances 7 provided on the left and right sides of the coating chamber 1 while being suspended on the conveyor 5. If necessary, a shut-off device such as an air curtain is provided at the entrance and exit to prevent dust from entering the painting chamber.

The spray gun 24 is mounted on the painting robot 2 and is automatically sprayed by compressed air. The spray gun 24 is controlled by compressed air from an electromagnetic valve operated by a signal from a normal control device. The spray gun 24 is applied to control the spraying position, direction, etc., which is an automatic coating machine, and coats the object A to be coated. As is well known, the painting robot 2 can be freely sprayed by changing the angle of the mounting part of the spray gun 24 and rotating it in addition to the vertical, horizontal, and back-and-forth movement by the arm 22, and it is repeatedly operated by the program taught. Is called.

The painting chamber 1 is provided with an opening 11 in a part of the front surface, and the opening area is limited to a range in which the arm 22 of the painting robot 2 operates. Accordingly, the outside air sucked into the painting chamber 1, that is, the inflow into the working chamber where the painting equipment is installed is restricted, and unnecessary outflow of conditioned air can be prevented. The size of the opening 11 is required to be wider when the workpiece A is large or the painting direction is complicated depending on the operating range of the spray gun 24. Since the coating unit 3 moves and can be controlled to a predetermined position so that the position of the spray gun 24 mounted on the coating robot 2 and the position of the coating chamber 1 itself can be matched with the coating part of the coating object A, the spray gun As a result, the size of the coating chamber and the size of the opening 11 can be kept small.

FIG. 2 shows a configuration in which two painting units 3 are provided so that the painting robot 2 is positioned on both sides of the object B to be painted. Each painting unit 3 has the above-described configuration, and the spray gun 24 mounted on the painting robot of each painting unit 3 is programmed so as to paint one side of the object B to be coated. The painting on both sides is completed when passing through. Therefore, both sides of the article B can be painted without rotating.

According to this configuration, even if the object to be painted is large and cannot be rotated in a narrow painting room, it is possible to paint both sides without rotating, and it is only necessary to install a painting unit with a small painting room, The painting area can be reduced and simplified, and equipment costs and equipment costs can be greatly reduced.

The painting robot 2 provided in the painting unit shown in FIG. 3 is a stationary general-purpose painting robot and has the same function as the above-described painting robot. Although the present invention is not limited to the type and performance of these painting robots themselves, it is necessary to be able to control the movement of the painting unit in conjunction with the operation required for painting and the control device for controlling the painting robot. In this case, it can be easily understood that it may be linked with the painting robot by another control device.

A region indicated by a dotted line so as to surround the painting robot indicates a case where fresh air is supplied as a supply chamber 6 through a filter. Although not shown in the drawings, the exhaust device includes means for sucking overspray mist together with the coating room air to collect and exhaust the mist for paint mist treatment. Those already known as the technology of the existing painting chamber are used. As an exhaust system that can be considered as another configuration, an exhaust introduction path is provided on a floor surface or a ceiling surface in a necessary range along a rail along which the coating room moves, and a part of the function of the exhaust processing means is separated. This means that the exhaust device of the present invention includes a part of the means for exhausting the paint mist-containing air in the coating chamber.

In these examples, it has been confirmed that the size of the coating chamber can be sufficiently accommodated with a width of about 1 meter. Therefore, as shown in FIG. 4, even if the object C is larger than the front of the paint room, such as a car bumper, it can be handled by a small paint unit and has been sent to the paint room. The coating is started from the opening by the spray gun of the coating robot, and the coating unit is controlled to move to the optimum position according to the movement of the coating position with respect to the object C to be coated.

The spray gun installed in the painting robot does not need to be operated over the entire range of the object to be coated, and if the position of the painting unit is relatively maintained, the range of operation can be limited to a narrow range, and in the concentrated spray direction. Painting is possible, eliminating the need to enlarge the painting chamber. In the embodiment, the painting unit is controlled to move with respect to the painting position of the painting object, and the painting robot is programmed so that the painting robot can paint in a limited range from the opening, thereby painting a large painting object. However, if the object to be coated has a simple shape, even if the coating unit is fixed, the object to be coated is sequentially moved by the conveyor, so that coating corresponding to the coating position is possible. However, the more complex the shape, the more complicated the operation of the painting robot will be to handle with only a uniform moving conveyor, and the spray direction will also be wide, so the painting unit will be the object to be painted and the painting robot. The effects of the present invention can be obtained by relatively controlling the movement in conjunction with the operation.

It is a block diagram of the coating processing apparatus which shows one Example of this invention. It is the layout figure which used two coating units of this invention and gave another implementation effect. It is a block diagram of the coating processing apparatus which shows the other Example of this invention. It is a block diagram which shows the case where a different large sized to-be-coated object is painted in the Example of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating chamber 2 Coating robot 3 Coating unit 4 Rail 5 Conveyor 6 Air supply chamber 7 Entrance / exit 11 Opening part 21 Drive shaft 22 Arm 23 Joint 24 Spray gun A, B, C

Claims (4)

A painting chamber having an exhaust device at the rear and a painting machine arranged at the front, and a painting robot that repeatedly operates in accordance with an operation signal stored and set in advance are integrally configured as a painting unit. A coating processing apparatus capable of moving with a moving means capable of controlling a relative position with respect to an object passing through a chamber. The controllable moving means is configured such that the coating unit is mounted on a rail with respect to the position of an object to be moved by being placed on or suspended from a conveyor, and driven in conjunction with an operation control device of a painting robot. 2. The coating processing apparatus according to claim 1, which is a reciprocating means that is driven by a signal and maintains a necessary relative position with respect to the object to be coated. The coating processing apparatus according to claim 2, wherein the reciprocating means is driven and controlled by a servo actuator or the like. 2. The coating processing apparatus according to claim 1, wherein the coating units are arranged so as to be opposite to each other so that the respective painting robots are positioned on both sides of the object to be coated.

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