JP3120995B2 - Paint temperature control system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint temperature control system applied to a production line for painting an automobile body.

"Conventional technology" In order to achieve high quality painting in a car body painting system, constant paint viscosity, constant paint pressure during spraying, Prevention of sedimentation of components such as resins, pigments, and aluminum can be mentioned.

FIG. 7 shows an example of the configuration of a system for painting an automobile body. The painting system of this example includes a painting robot and the like and a painting booth 1 into which the automobile body is carried. A dispensing tank 2 for supplying paint to the coating booth 1, a drum 3 for supplying paint to the dispensing tank 2, and a hot water tank 4 for supplying hot water to the dispensing tank 2. I have.

The mixing tank 2 has a double structure consisting of an outer container and an inner container, and can store paint inside the inner container, and can flow hot water through a flow path formed between the inner container and the outer container. It has become.

Further, the coating booth 1 and the mixing tank 2 are connected by a pressure feed pipe 6, the mixing tank 2 and the drum pipe 3 are connected by a supply pipe 7, and the flow path between the inner container of the mixing tank 2 and the outer container and the hot water The tank 4 is connected by a supply pipe 8.
Further, a pump 9 is provided in the pressure feed pipe 6, and a pump 10 is provided in the supply pipe 7.
However, pumps 11 are incorporated in the supply pipes 8, respectively, so that the paint can be supplied to the blending tank 2 and the paint can be pumped to the painting booth 1.
Hot water can be supplied to the flow path between the inner container and the external container.

The paint stored in the mixing tank 2 and the drum 3 is always of the same color. Therefore, although omitted in the drawing, a blending tank 2, a drum 3, a hot water tank 4, a pressure feed pipe 6, a supply pipe 7, a supply pipe 8, and pumps 9, 10, 11 provided for feeding paint to the coating booth 1. Are all provided for one painting booth 1,
Each mixing tank 2 and the drum 3 contain only the same color paint. Therefore, in order to apply a paint of a predetermined color to an object to be painted such as a car body conveyed to the paint booth 1, a paint tank containing a paint of a desired color is selected from the plurality of blending tanks 2. Then, the paint is sent from the mixing tank 2 to the painting booth 1.

[Problem to be Solved by the Invention] In the coating system having the above-described configuration, in order to control the temperature of the paint to be fed to the coating booth 1, the temperature of the paint in the blending tank 2 is measured, and the temperature of the paint falls below a specified temperature. ,
Hot water is supplied from the hot water tank 4 to the flow path between the inner container and the external container of the mixing tank 2 and the paint is heated by the hot water.

By the way, the conventional system for adjusting the paint temperature by heating the warm water has the following problems.

A plurality of blending tanks 2 are provided for one painting booth 1. However, since a large number of bodies are randomly transferred to the painting booth 1, it is necessary to paint dozens of colors in the painting booth. is there. Therefore, conventionally, in the coating booth 1, the temperature of all the mixing tanks 2 has been constantly adjusted so that the coating can be performed in any color at any time. For this reason, enormous energy was required to control the temperature of the paint.

The present invention has been made to solve the above problems,
It is an object of the present invention to provide an energy-saving temperature control system configured so that only the minimum necessary amount of paint can be temperature-controlled.

[Means for Solving the Problems] In order to solve the problems, the invention described in claim 1 includes a coating booth a and a plurality of objects B to be coated in the coating booth a, as shown in FIG. A line R for sequentially transporting;
Tracking data t attached to each object to be painted B and provided with the type of color of the object to be painted; a plurality of paint transporting means A for sending paint to a painting booth a; temperature control means for controlling the temperature of the paint to be sent to the coating booth a, and detection for discriminating the kind of color of the workpiece B conveyed to the coating booth a from the tracking data t of the workpiece B approaching the coating booth a. And a detection control unit m for operating only the temperature control means of the paint transfer means A provided with the paint of the color detected by the detection device l from the tracking data t. A hanger plate 91 is attached to a hanger 90 for supporting an object to be coated, a plurality of windows are provided on the hanger plate 91 so as to be openable and closable, and the hanger plate 91 is constituted by symbols attached to the windows. That.

In order to solve the above-mentioned problem, the invention described in claim 2 comprises a coating booth a and a line R for sequentially transporting a plurality of objects B to the coating booth a as shown in FIGS. The color of the object B based on the tracking data t attached to each object B and having the color type of the object B and the tracking data t before being conveyed to the painting booth a by the line R. A color changing means for rearranging and selecting the same color object to be coated B and sending it to the coating booth a;
A plurality of paint transfer means A for sending the paint to each other, a temperature adjusting means provided in each paint transfer means A for adjusting the temperature of the paint to be sent to the coating booth a, and the object B transferred to the color changing means 70. A detection device 1 for determining the type of the color from the tracking data t, and a detection control unit that operates only the temperature adjusting unit of the paint transfer unit provided with the color paint detected by the detection device l from the tracking data t. It is provided.

"Action" The tracking data of the object to be coated such as the body of a car approaching the painting booth is read out by the detection device to determine the color required for painting, and multiple paints connected to the painting booth are transferred based on the determination result. Among the means, only the paint of the corresponding paint transfer means is temperature-controlled, so that the energy consumption is remarkably reduced as compared with the case where the paint of all the paint transfer means is temperature-controlled, and the paint required for painting is desired. Temperature is reliably controlled to

If the tracking data is read at the stage of the color changing means before entering the painting booth, the temperature of the necessary and sufficient amount of paint can be more smoothly adjusted.

"Embodiment" FIG. 2 shows an embodiment of a paint temperature control system to which the present invention is applied. The apparatus of this embodiment is provided on a production line shown in FIG.

First, the paint temperature control system shown in FIG. 2 will be described.

In this embodiment, reference numeral 20 denotes a painting booth which includes a painting robot and the like, and in which a vehicle body (object to be painted) B is conveyed by a line omitted in FIG.
Reference numeral 21 denotes a mixing tank, 22 denotes a drum, 23 denotes a cold water tank, and 24 denotes a hot water tank.

The cold water stored in the cold water tank 23 has a temperature lower than a target paint temperature (for example, 25 ° C. ± 1 ° C.) to be controlled in the system of the present invention. The temperature is higher than the target paint temperature. Further, the outgoing pipe 26 and the return pipe 27 are connected to the cold water tank 23, the outgoing pipe 28 and the return pipe 29 are connected to the hot water tank 24, and a branch is connected to the outgoing pipe 26 and the outgoing pipe 28. A control type three-way valve 30 capable of adjusting the flow rate is incorporated in the pipe, and a control type three-way valve 31 capable of adjusting the flow rate is incorporated in the branch pipe connected to the return pipe 27 and the return pipe 29. The outgoing pipe 26 incorporates a cold water pump 32, and the outgoing pipe 28 incorporates a hot water pump 33.

On the other hand, the bottom of the mixing tank 21 and the painting booth 20
The heat exchanger 36 is incorporated in the pressure feed pipe 35. The input side of the heat receiving section 36a of the heat exchanger 36 communicates with the mixing tank 21, and the output side of the heat receiving section 36a communicates with the coating booth 20. Also, the mixing tank 21 and the heat exchanger 36
Between the pumping pipe 37 and the accumulator
38 and a line filter 39 are incorporated.

The pressure feed pipe 35 is connected to an input section of a coating robot provided inside the coating booth 20, and a return pipe 40 connected to a return section of the coating robot is connected to an upper part of the mixing tank 21. Therefore, the paint pumped to the painting robot through the pumping pipe 35 is applied to the body of the automobile in the painting booth as necessary, or the paint is returned to the blending tank 21 via the return pipe 40. It is being circulated.

On the other hand, the input side of the heat radiating portion 36b of the heat exchanger 36 is connected to the supply pipe 42.
Is connected to the three-way valve 30 via a discharge pipe, and the discharge side of the heat radiation part 36b is connected to the three-way valve 31 via a discharge pipe 43.
Further, in the vicinity of the three-way valve 31, a measuring device 45 for measuring the temperature of the fluid in the discharge pipe 43 near the three-way valve 31, and a temperature controller 46 connected to the measuring device 45 and the three-way valve 31 are provided. Is provided.

Further, a measuring device (detection means) 47 for measuring the temperature of the fluid in the pressure feeding tube 35 is provided in the pressure feeding tube 35 between the heat exchanger 36 and the coating booth 20, and near the measuring device 47, Temperature controller 48
The monitor 49 is connected to the temperature controller 48, and the monitor 49 is provided with a printing machine. The temperature controller 46 controls the degree of opening of the three-way valve 31, and includes a temperature controller.
48 controls the opening of the three-way valve 30.

In FIG. 2, reference numeral 50 denotes a control device such as a computer, and a temperature sensor 51 for measuring the outside air temperature is electrically connected to the control device 50, and further, a temperature near the coating booth 20 is measured. A temperature sensor 52 is electrically connected, and a three-way valve 53 incorporated in the supply pipe 42.
, And further electrically connected to the measuring device 47 and the temperature controller 48.

In FIG. 2, reference numeral 55 denotes an automobile body (object to be painted) being conveyed to the painting booth 20, and 56 denotes this body.
This is a detection device for detecting 55 and operating the control device 50.

In the above configuration, the paint supply means is constituted by the drum 22, the mixing tank 21, and the pressure pump 37, and the cold water tank
23 and the cold water pump 32 constitute a cold water supply means, and the hot water tank 24 and the hot water pump 33 constitute a hot water supply means, and the control device 50 controls the comparison means, the control unit, the comparison unit, and the detection control unit. It is provided with.

Although not shown in FIG. 2, a plurality of paint supply means are connected to one coating booth 20, and each paint supply means is provided with a hot water supply means and a cold water supply means. In addition, a control device 50 is connected to the controller, and the temperature of the paint provided in each paint supply means can be separately adjusted by operating the control means, as described later.

Next, an outline of the production line shown in FIG. 3 will be described.

After the body B of the automobile is temporarily stored in the WBS, it is placed on a hanger conveyor and sequentially passes through a pre-processing section 61, an electrodeposition section 62, and an electrodeposition furnace 63 to be subjected to electrodeposition coating. Next, the processing is performed by passing through the sealer 64, the undercoat section 65, and the sealer furnace 66. Further, the defective portion is adjusted in the blanking section 67, and the intermediate coating processing is performed through the intermediate coating section 68 and the intermediate coating furnace 69.
This intermediate coating process is performed to improve the quality of the overcoat performed later, and the color of the intermediate coating is common to all the bodies. After the intermediate coating process, the body B moves to the color changing means (color alignment storage) 70.

The color changing means 70 is a line for rearranging the body B so that the same color paint is continued as much as possible. If the same color does not continue, the colors are rearranged so that a color that is not affected by the previous paint color continues. The color changing means 70 will be described later in detail.

The body B is subsequently provided with a pre-coating pre-adjustment section 71 and an enamel processing section 72.
Then, it passes through the clear processing unit 73 and the top coating furnace 74. The coating booth 20 is provided in the enamel processing section 72, and the coating temperature control system shown in FIG. 2 is additionally provided in the enamel processing section 72.

After the painted body B is inspected by the inspection unit 75, the black processing is performed in the block processing unit 76 and the black furnace 77, and the black part is painted.

The body B that has exited the block furnace 77 is transported to the next step through the wax processing section 79.

Next, a mechanism for rearranging a large number of bodies B in the color changing means 70 will be described.

As shown in FIG. 4, the body B of the car is
It is supported on hangers 90 of a large number of hanger conveyors provided along the line R.

A hanger plate 91 is attached to each hanger 90, and a plurality of (eight in this embodiment) windows are formed in each hanger plate 91 as shown in FIG. Symbols such as numerical values and characters are attached to these windows, and a predetermined identification hanger number (tracking data) is indicated depending on whether each window is open or closed. Tracking data is
It is unique to each hanger so that the same value is not set.

The tracking data is read by a hanger reader 92 shown in FIG.
The hanger reader 92 is provided at the input section of each hanger conveyor and at a predetermined position.
5 is detected by the photoelectric tube as shown in FIG. 5, and at this timing, the open / close state of each window is examined.

When tracking data is detected in each section of the production line, the information is recorded in a host computer that controls the production line one by one.

FIG. 6 shows an example of the recorded contents. In FIG. 6, M indicates an internal memory of the host computer, and A1, A
2, A3... Indicate the storage areas. For example, in the storage area A1, body information indicating that a domestic body, a vehicle type is A ', and the color is red is stored, and tracking data of a hanger equipped with the body is stored in the storage area A1. Has become.

As described above, the computer of the production line is configured to record what kind of vehicle body is mounted on each hanger 90 and what color the paint is.

Next, the operation of the paint temperature adjusting system configured as described above will be described.

First, an automobile body 55 before painting is sequentially conveyed from the line R to the painting booth 20. When the body 55 reaches the inside of the painting booth 20, the painting robot sprays paint on the body 55 in the painting booth 20 based on the detection of the detection device 56, and the body 55 is painted.

When painting of body 55 is completed at painting booth 20,
55 is transported to the next process along line R,
Another vehicle body before painting is transported to 20 again.

To paint the body 55 in the painting booth 20, the paint stored in the formulation rank 21 is pumped by the pump 37.
And can be carried out by pressure feeding to the coating booth 20.

The temperature of the paint to be pumped to the coating booth 20 is adjusted as described below.

First, when the paint passes through the feed pipe 35, the measuring instrument 47 detects the paint temperature, and the measurement result is sent to the control device 50. In this measurement result, the comparison means incorporated in the control device 50 indicates that the temperature controller 48
Is operated to control the three-way valve 30 to increase the supply of hot water to the heat exchanger 36 and decrease the supply of cold water. In addition, when the paint temperature is improving according to the measurement result of the measuring device 47, the three-way valve 30 is controlled by operating the temperature controller 48 to increase the supply amount of the cold water to the heat exchanger 36 and the supply amount of the hot water. Decrease. As described above, by adjusting the amount of the cooling medium sent to the heat exchanger 36 by adjusting the three-way valve 30, the paint temperature can be adjusted.

By the way, even when the paint temperature is adjusted as described above, the paint temperature may suddenly drop for some reason. In this case, the control device 50
The opening of the three-way valve 30 is adjusted via the temperature controller 48 so that the refrigerant is not sent to the 36, and the opening of the three-way valve 30 is continuously adjusted so that the maximum amount of the heat medium is sent to the heat exchanger 36. Adjust

As described above, the temperature of the paint can be adjusted by adjusting the supply of the cooling medium.

By the way, while the opening of the three-way valve 30 is being adjusted by the control device 50 via the temperature controller 48, the comparison unit built in the control device 50 causes the actual measurement value of the coating temperature and the target value of the coating temperature (cooling (For example, 25 ° C. ± 1 ° C.) can be displayed on the monitor 49. In addition, the comparison unit of the control device 50 displays the control signal output to the temperature controller 48 in addition to the target value and the actual measurement value of the paint temperature on the monitor 49, and prints the graph in a printing machine (not shown). it can.

In this way, it is possible to know the difference between the target value of the paint temperature displayed on the monitor 49 and the actually measured value. And, when a large difference occurs between the paint temperature and the control signal output,
That is, when the output of the control signal is increasing but the measured value of the paint temperature continues to decrease without being corrected at all, whether any part of the temperature management system has failed or an abnormal situation has occurred The occurrence of the occurrence can be inferred by the operator using the monitor 49, and the operator can quickly take a countermeasure corresponding to the occurrence. For this reason, it is possible to prevent defective painting on the body of the automobile.

By the way, there are various types of automobile bodies B supplied to the production line shown in FIG. 3, and there are also various colors. The body B conveyed to the production line is not conveyed by color, but is conveyed in a random state when viewed by paint color for order or other reasons.

In order to make the body B conveyed in this random state ready for painting with any color, all the paint transfer means A provided individually for each color are described above. However, if temperature adjustment is performed for all paints one by one, energy such as electric power is wasted.

Therefore, the tracking data of the body 55 approaching the painting booth 20 is read by the detection device 56, and the body 55 is read.
Only the temperature control means of the paint transfer means A having the above color is operated by the control device 50 to control only the temperature of the paint of that color, and the temperature control means is stopped for the other paints. In this case, it is possible to efficiently control the temperature of a necessary and sufficient amount of the coating material without wasting power energy.

Next, minutes before the body 55 reaches the painting booth 20,
It is necessary to start the control of the paint temperature of the desired color. However, if the control of the paint temperature is started in a state where the paint temperature is not controlled in advance, the paint temperature becomes the desired temperature from the start of the control. Measure how long it takes to reach. Then, before the body 55 arrives at the painting booth 20, and before the time necessary for the temperature adjustment, or slightly before the time, the detection timing of the detection device is set to start the control of the paint temperature. Should be set.

Therefore, for example, when it takes 15 minutes to adjust the temperature of the paint of a specific color to a predetermined temperature, the detection device is set so that the detection device can be operated 15 minutes before the time when the body 55 reaches the coating booth 20. Installation and control of the paint temperature may be started.

By the way, in the process before entering the painting booth 20, when the color alignment storage 70 is passed,
The temperature control of the paint of that color may be started when the body 55 has reached 70.

In the color alignment storage 70, the host computer of the production line changes the color of the body based on the tracking data of the body 55, and stores a specified number of bodies 55 on the line R. And the body 55 of each color is a specific number,
When the computer stays on the line of the color changing means and is stocked, the computer of the production line starts to carry the body 55 into the painting booth 20 sequentially from the body 55 of the same color system. Thus, by reading the tracking data recorded on this host computer, or by reading the tracking data at a particular location in the color alignment storage 70, which body of the color will reach the paint booth 20 minutes later. Color alignment storage 70
After the body 55 has been color-changed and aligned, and before the body 55 reaches the painting booth 20, the temperature control may be started by operating the detection device so as to start the temperature control of the paint of the color.

By doing so, the body 55 sent to the painting booth 20 can be made of the same color system, and at the same time, the temperature of the minimum necessary paint can be controlled efficiently, so that high quality painting can be performed efficiently. Can be.

By the way, in the above-mentioned embodiment, the present invention is applied to the production line and the painting booth of the automobile, and the embodiment in which the body of the automobile is selected as the object to be coated has been described. Of course, the present invention may be applied to a line, and of course, may be applied to a painting booth of another product.

"Effects of the Invention" As described above, according to the present invention, the color required for painting is determined by reading out tracking data attached to an object to be painted such as an automobile body approaching a painting booth by a detection device, Based on the result of this determination, it is possible to control only the temperature of the paint of the paint transfer means having the paint of the color corresponding to the approaching body among the plurality of paint means connected to the paint booth.

Therefore, compared to the conventional system in which the temperature of all paints is adjusted regardless of whether the paint booth is approached or not, energy saving can be remarkably reduced, and paints required for painting in the paint booth are:
There is a characteristic that the temperature can be reliably adjusted to a desired temperature before the object to be coated reaches the coating booth.

The tracking data forms a line. A hanger plate is attached to a hanger for supporting the object to be coated, a plurality of windows are provided on the hanger plate so as to be openable and closable, and the hanger plate is constituted by symbols attached to the windows. It is provided so as to be attached to the object to be painted, and is transported integrally with the object to be painted, and is read by a hanger reader etc., so that the object to be painted and the tracking data are always paired, and As compared with a case where data for each object to be coated is manually input to a computer, there is an advantage that accurate data input can be performed with less possibility of occurrence of an error.

In addition, if the tracking data is read at the stage of the color changing means before entering the painting booth, even if various objects to be painted having different painting colors are transported at random on the line, the objects of the same color system can be used. The painted object can be efficiently painted, and the energy required for controlling the paint temperature at that time can be omitted.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a configuration diagram of a coating system to which the present invention is applied, FIG. 3 is a configuration diagram of a production line to which the present invention is applied, and FIG. FIG. 5 is a block diagram showing a hanger plate with a body mounted thereon, FIG. 5 is a block diagram showing a hanger plate, FIG. 6 is a memory map showing storage contents of a computer memory, and FIG. 7 is a block diagram showing an example of a conventional coating apparatus. It is. B: Body (object to be painted), 20: Painting booth, 21 ...
Mixing tank, 22 ... drum, 23 ... cold water tank, 24 ...
… Hot water tank, 26,28 …… Outgoing pipe, 27,29 …… Return pipe, 30 ……
Three-way valve, 32 …… Cold water pump, 33 …… Hot water pump, 35 ……
Pumping pipe, 36 ... heat exchanger, 37 ... pumping pump, 40 ... return pipe, 45, 47 ... measuring instrument, 48 ... temperature controller, 49 ... monitor, 50 ... control device, 55 ... … Body, 56 …… detector,
70: color changing means (color arrangement storage), 72: enamel coating part, 91: hanger plate, 92: hanger reader, 93: phototube.

Claims (2)

(57) [Claims] 1. A coating booth, a line for sequentially transporting a plurality of objects to be coated to the coating booth, tracking data attached to each object to be coated and having a type of color of the object to be coated, A plurality of paint transfer means for sending paint, temperature control means provided in each paint transfer means for adjusting the temperature of the paint to be sent to the coating booth, and a type of color of the object to be coated conveyed to the coating booth. A detection device that determines from the tracking data of the object to be coated approaching, and a control device that operates only the temperature adjustment unit of the paint transfer unit having the color paint detected from the tracking data by the detection device, The tracking data comprises a hanger plate attached to a hanger for supporting the object to be coated, which constitutes the line, and a plurality of windows are provided on the hanger plate so as to be openable and closable. A paint temperature control system comprising a symbol attached to the window. 2. A painting booth, a line for sequentially transporting a plurality of objects to be painted to the painting booth, tracking data attached to each object to be painted and having a color type of the object to be painted, and a line for painting. Color change means for rearranging the objects to be coated based on the tracking data based on the tracking data and selecting an object of the same color to be transmitted to the coating booth before being transported to the booth,
A plurality of paint transfer means for sending paint to the coating booth, a temperature control means provided in each paint transfer means for adjusting the temperature of the paint to be sent to the coating booth, and the color of the object transferred to the color changing means. A detection device that determines from the type of the tracking data, and a control device that operates only the temperature control unit of the paint transfer unit that includes the color paint detected by the detection device from the tracking data. Paint temperature control system.