JPH10168599A - Multikind continuous painting system for multiple works and work kind display for works' description member to be used for the system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable automatically changing or resetting necessary conditions for a treatment in required regions of pretreatment, painting and drying to conditions suitable for the work kind thereof before works (group) are carried into individual required regions among the pretreatment, painting and drying, effectively producing coated articles corresponding to individual work kinds, saving of water, electric power consumption, reduction of required number of workers and reduction of cost of the entire system in a coating system in which works of plural kinds having different treatment conditions are continuously carried mainly by work group of the same kind. SOLUTION: The coating system is constituted by being provided with a work kind display member 7 which is carried in the position immediately before the work (work group of the same kind) and is capable of mounting a hitting bar 8 for indicating the subsequent work kind, limit switches 9 which are disposed respectively in the position on this side from the region on work carrying-in side at each region and output work kind information signals by contacting with the hitting bars 8 when the member 7 passes and controlling device with which the above mentioned treatment conditions are changed and resetted in accordance with the signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating system for performing a required series of pre-processing (generally, degreasing / chemical conversion), electrodeposition or spraying, and baking in a factory for home electric appliances and automobiles. . More specifically, the present invention relates to a plurality of types of workpieces having different processing conditions,
The present invention relates to a multi-kind continuous coating system in which a work group of the same kind is continuously conveyed mainly by a conveyor, and is sequentially passed through each area where the above-mentioned processing is performed to finish a coated product.

[0002]

2. Description of the Related Art In general, in the case of indoor office supplies such as lockers, desks, etc., painting is conventionally performed by directly spraying a paint on a work without pretreatment and then drying the work. Have been done. On the other hand, in the case of home electric appliances and the like, conventionally, after a pre-treatment, that is, a degreasing / chemical conversion treatment, a workpiece is subjected to an electrodeposition treatment of a paint, a spray treatment or a combination thereof (that is, painting). Finishing is performed by baking the coating film. In addition, depending on the type of home electric appliance or the like, there is also a case in which after coating, the coating film is finished by natural drying without baking treatment. In a factory for home electric appliances and the like, conventionally, as a general (typical) electrodeposition coating method for a product body or the like, a plurality of workpieces such as a product body are continuously and continuously suspended while being held by a conveyor. Conveying and passing through a pre-treatment area where degreasing and chemical conversion treatment is performed, a coating area where electrodeposition treatment of paint is performed, and a drying area where coating film is baked, thereby finishing the electrodeposition coated product. Production process is adopted. Recently, in order to meet the demand for small quantities of various products and to improve production (painting) efficiency, a multi-product continuous electrodeposition coating method, that is, simultaneous work of multiple types of workpieces with different specifications such as product size and shape, etc. Conveyed to one electrodeposition coating line, usually, a group is made of a plurality of works of the same type, and successively conveyed for each group, a series of electrodeposition coating processes is performed simultaneously for multiple types of works. The method of doing is adopted. This method
It is also called the mixed (transport) electrodeposition coating method.

[0003]

In this mixed electrodeposition coating method, since various types of workpieces are conveyed simultaneously and continuously, individual workpieces or a group of workpieces of the same type are subjected to degreasing / chemical formation and electrodeposition. Or, in advance of receiving the baking process, that is, at the stage of arriving at the processing area and just going to receive the processing, the conditions for performing the processing are suitable for the type of the work. Need to be changed or reset. For example, the operation of the washing shower in the degreasing / chemical conversion treatment and the amount of water used in the immersion washing, the applied voltage value in the electrodeposition treatment, the voltage application time and the operation of the washing shower after the electrodeposition, and the drying in the baking treatment Various processing conditions, such as furnace temperature, drying time and heating rate, are subject to the above changes or resets.

However, in general, the pretreatment area is configured by arranging a degreasing treatment tank, a chemical conversion treatment tank, a shower apparatus, a immersion water washing tank, and the like in one long chamber, and an operator enters the chamber. It has a structure that cannot do it. In addition, the coating area is generally configured by covering the upper part of the electrodeposition coating tank with a cover except for the work loading side and the work loading side, so that a worker cannot directly see the state of the electrodeposition process. It has become. Further, the drying section is generally constituted by a long drying furnace for performing a baking process, and an operator cannot naturally check the inside of the drying furnace which is in a high temperature state during baking. Therefore, conventionally, for each area of the pretreatment zone, the coating zone and the drying zone, the worker is arranged at an appropriate place at least outside the zone on the work loading side and the workpiece unloading side, and
In each of these areas, when performing a degreasing / chemical formation, electrodeposition or baking process on a work of a certain type or a group of works of the same type, first, the other work of the preceding type which has been transported immediately before the work or the group of works of that type. It is confirmed by the communication between the workers that the work or the work group of the variety has completely escaped from the area to the outside of the area, and the processing conditions for degreasing / chemical formation, electrodeposition or baking are then processed. A work method has been adopted in which the condition is changed or reset to a condition suitable for the type of work, and then the processing is performed on a work or a group of works of the type.

[0005] However, such a conventional working method consumes a great deal of unnecessary power, such as water and electric power, and requires a large number of workers. In addition, it also requires degreasing / chemical formation, electrodeposition, or the like. It takes a considerable amount of time to shift the object of baking from a work or work group of one type to a work or work group of another type, which has the disadvantage that production (painting) efficiency is very poor.

Therefore, as an improvement of the above method, conventionally,
In the loading stage where the work is first hung on the transfer hanger in order to transfer the work to a series of electrodeposition coating lines, the operator determines, for each work, the type of the work and the conditions of each processing according to the type. A written tag is attached to the hanger along with the hanging of the workpiece, and along with it another worker is transported to the individual pretreatment, painting and drying areas. At the stage before, visually confirm the type of the work and the processing conditions corresponding thereto, and then, if necessary, manually change or reset the conditions of the degreasing / chemical formation, electrodeposition or baking, and then A work method of performing the processing on the work has been adopted. According to this work method, in the case of continuously transporting a group of works of the same type, it is possible to reduce a transition time when a processing target changes from one type of work to the next type of work,
In this regard, the coating efficiency can be improved. However, in the above working method, for each of the pre-treatment, painting and drying sections, at a position just before the work is conveyed into the section, the worker always makes sure that the work type and It is necessary to check the processing conditions visually, and therefore, there still remains a problem that a large number of workers are required and labor costs cannot be sufficiently reduced. In addition, the actual work is performed by confirming whether or not the type of the work indicated on the tag of the transfer hanger matches the type of the work suspended on the hanger for each work. Is confirmed, the condition of the processing is changed or reset. Therefore, the above-mentioned working method has the disadvantage that the time required for performing the entire process of degreasing / chemical formation, electrodeposition and baking per work is still long, and the production (painting) efficiency as a whole is still poor. Furthermore, the above-mentioned working method has not substantially improved in terms of reduction of consumption of water, electric power and the like.

On the other hand, in the process of electrostatic painting of the surface of a vehicle body in an automobile factory, means such as a photoelectric switch have conventionally been provided at a position before the vehicle body is conveyed into the electrostatic painting area. At the time of driving, the shape of the car body that has arrived at that position is detected by the above-mentioned means, and then the computer control device is used to detect various components of the electrostatic coating device based on information on the detected body shape, such as a spray-type coating gun and a bell. 2. Description of the Related Art A coating control system has been adopted in which a driving operation of a type electrostatic coating machine or the like is comprehensively and automatically controlled, and thereby, electrostatic coating is performed on a required range on the surface of an automobile body. However, this coating control system is generally a large and expensive control system. In addition, since home appliances have fewer product design restrictions and a wider variety of shapes and dimensions than car bodies, the paint control system used for electrostatic painting of car bodies must be used in home appliances. In order to use the electrodeposition coating, it is necessary to modify the coating control system to be more complicated and more expensive. Therefore, the control technology in the electrostatic coating of an automobile body cannot be immediately diverted to the electrodeposition coating of home electric appliances because such a drastic change in control technology and a significant increase in production costs are caused. Is difficult in practice.

[0008] The above situation is not only when the above-described continuous electrodeposition coating for home electric appliances, that is, when the respective processes of degreasing / chemical formation, electrodeposition and baking are sequentially performed on the workpiece, but also without baking. In the case of natural drying (that is, in the case of performing only degreasing / chemical conversion treatment and electrodeposition treatment), or in the case of applying a work by spraying using a liquid paint or powder paint instead of the electrodeposition treatment In addition, even when the degreasing / chemical conversion treatment is not performed before the coating (for example, in the coating of indoor office supplies), the same applies to all cases, and points to be improved remain.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described background, and has been made to improve the prior art. In the case of continuous transport to the required area of the pre-treatment area, coating area and drying area for each
Before a work of a certain type or a group of works of the same type is transported into each required area, the conditions of each required processing such as degreasing / chemical formation, electrodeposition and baking are adapted to the work type. Can be automatically changed or reset to a product, so that it is possible to produce a coated product of good quality corresponding to each work type, and furthermore, by changing or automatically resetting processing conditions, In addition to saving water and electric power consumption, the number of required workers can be significantly reduced, and thus energy and labor costs can be reduced sufficiently. Can significantly reduce the time it takes to migrate
Therefore, production (painting) efficiency can be improved, and the existing painting system can be used almost as it is.
An object of the present invention is to provide a multi-product continuous coating system in which the entire system is inexpensive. Another object of the present invention is to provide a work type indicating member used in the multi-type continuous coating system.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a plurality of types of workpieces having different processing conditions are conveyed by a conveyor mainly for each group of workpieces of the same type.
In general, paint is finished by passing through the required areas of a pretreatment area where degreasing / chemical conversion treatment is performed, a coating area where electrodeposition or spraying of paint is performed, and a drying area where coating film is baked in order. In the kind continuous coating system, a member that can be attached to and detached from the conveyor and conveyed at a position immediately before a work of a certain kind or a group of works of the same kind, and that is a kind of a subsequent work or a subsequent same kind A work type indicating member to which a mark element indicating the type of the work group can be attached, and a work type indicating member provided for each of the required areas at a position before the area on the work loading side, and A type discriminating means for detecting the sign element and outputting a type information signal when passing therethrough; and a processing process in each of the required areas. And a controller for changing or resetting various conditions necessary for these processes based on the type information signal from the connected type identification means. It is related to a kind continuous coating system. The present invention also relates to the above-described workpiece type indicating member itself.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present coating system includes both an electrodeposition coating system and a spray coating system.
In general, a pretreatment area for degreasing / chemical treatment, a coating area for electrodeposition or spraying of paint, and a drying area for baking of a coating film are provided with required areas. This is a coating system in which a workpiece is passed through these required areas and finished into an electrodeposition or spray coating product. In particular, the present invention relates to a multi-product continuous coating system (also referred to as a mixed coating system), that is, a plurality of types of workpieces having different processing conditions due to different outer shapes, dimensions, surface properties, etc., are mainly processed by a conveyer. In this case, the object is a coating system in which the workpieces are continuously conveyed for each of the work groups, and sequentially passed through the above-mentioned required area to finish the coated product. In the pre-treatment area, in the case of electrodeposition coating, usually, from the work loading side, a shower water washing device, a degreasing tank, a shower water washing device, a chemical conversion tank, a shower water washing device, a dip water washing device, and a pure water shower device. And so on. In addition, in the case of spray coating, similar equipment that can generally perform degreasing / chemical conversion treatment is provided. In the case of electrodeposition coating, the coating area is usually provided with an electrodeposition paint tank (with an overflow tank, a filter, etc.), a shower water washing device, a dip water washing device and a pure water shower device. In the case of spray coating with liquid or powder coatings,
In the painting booth, a painting gun, a bell type electrostatic painting machine, a reciprocating painting machine or the like is provided. Furthermore, the drying section is usually provided with a tunnel-type drying oven (provided with a fan, a burner, a heat exchanger, etc.) for both the electrodeposition coating and the spray coating. The drying oven generally has a radiant heating zone followed by a convective heating zone, and
A heating section is provided from the work entrance to a predetermined length.

The work type indicating member is a member for indicating the type of a work, particularly, the type of a work or a group of works following the member when used, and is characteristic of the coating system of the present invention. This marking member can be attached to and detached from the work conveyor. For example,
When the conveyor is an overhead conveyor, the work type indicating member has a structure that can be hung on a transfer rail, similarly to the work hung on the hanger, and when the conveyor is a floor conveyor, The type indicating member has a structure capable of traveling on a transport rail, similarly to a transport jig loaded with a work. The workpiece type indicating member is configured such that when a workpiece of a certain type or a group of the same type of workpiece is caused to flow through a work transport path of a painting process, the workpiece is firstly transported at a position immediately before the workpiece or the group of the workpiece. Then, it is attached to the transport conveyor at the stage of loading. In addition,
In the unloading stage, if necessary, the work type indicating member is removed from the conveyor and replaced with another work type indicating member. Also, the work type marking member is
It has a configuration in which a marking element indicating the type of work, for example, a hitting rod, a transmission hole, or a reflection plate can be mounted.
The marking elements are provided respectively corresponding to the respective types of workpieces, and accordingly have several types. Further, the marker element may include a marker element of a type indicating that it is the last work or the last work group of the same type on the work day. The marker element is selected depending on the type of the following type discriminating means. For example,
When the means is a limit switch, as a sign element, a hitting rod or the like which performs an on / off operation of the limit switch is employed.When the means is a transmissive or reflective photoelectric switch, the sign element is used as a sign element. Is
A transmission hole or a reflection plate that enables light emitted from the light emitter of the photoelectric switch to enter the light receiving sensor is employed. Therefore, the workpiece type indicating member is attached with a marking element indicating the type of the workpiece and is conveyed at a position immediately before a workpiece of a certain type or a group of workpieces of the same type. Subsequent types of a work group of the same type can be represented. In addition, since the workpiece type indicating member can be attached to and detached from the conveyor as well as the workpiece, the present invention modifies or modifies the existing conveyor of the coating system for application of the system of the present invention. There is no necessity, and there is an advantage that the existing conveyor can be used as it is. The work type indicating member may have a structure in which a mark indicating the work type composed of characters, symbols, or figures, that is, a so-called kanban can be attached. Thus, the operator can visually check the type of the work actually being transferred on the work transfer path.

The type determination means is a means for detecting the above-mentioned marker element and outputting a type information signal (an electric signal relating to information on the type of the work, etc.), such as a limit switch, a photoelectric switch or a proximity switch. In the dressing or spray coating process, each of the required areas among the pretreatment area, the coating area, and the drying area is provided at a position before the area on the work loading side. "Sensitivity of the sign element" means, for example, when a limit switch is turned on by contact with the hitting rod of the sign element.
It refers to performing an off operation, and when it is a photoelectric switch, refers to performing an on / off operation by light passing through a transmission hole of the sign element or by light reflection on a reflector of the sign element. Therefore, at the time of operation, in each of the above-mentioned required areas, when the workpiece type indicating member passes at a position in front of the workpiece loading side, the type identifying means detects the marking element mounted on the workpiece type indicating member. Thus, a predetermined type information signal corresponding to the type of work is output.

The control device controls the processing (degreasing / chemical conversion, electrodeposition or baking) of each of required areas among the pretreatment area, the coating area and the drying area of the electrodeposition or spray coating system. (Generally a computer control device). In the present invention,
It is connected to the above-mentioned type discriminating means. Therefore, based on the kind information signal from the kind discriminating means, the control device automatically changes or re-requires various conditions required for processing (degreasing / chemical formation, electrodeposition or baking) in each of the above-mentioned required areas. Set. Therefore, in the present invention, only a part of the existing control device used in the electrodeposition or spray coating system is improved and can be sufficiently used as the control device in the present invention. In the present invention, the processing conditions to be changed or reset include, for example, the operation of each pump connected to the degreasing tank, the chemical conversion tank, and the dip washing tank in the pretreatment zone (that is, immersion). The amount of water used at the time), the operation of hot water shower and the operation of each water shower, and the like. These treatment conditions are almost the same for both the electrodeposition coating and the spray coating. Also, in the coating area, the processing conditions to be changed or reset in the case of electrodeposition coating include the value of the applied voltage and the time of voltage application when performing the electrodeposition process, and after the electrodeposition. The operation of the dip washing pump and the operation of the washing shower are described. The processing conditions to be changed or reset in the case of spray coating using powder paint include the speed and range of movement of the coating machine, the discharge amount of powder paint, and a change in the coating pattern. . Further, in the case of spray (electrostatic) coating using a liquid paint, processing conditions to be changed or reset include a moving speed and a range of a coating machine, a discharge amount of a liquid paint, and a paint / work space. Change of the applied voltage. Further, in the drying section, the baking temperature, the drying time, and the heating rate of the baking drying furnace are mentioned, and these processing conditions are almost the same in the case of the electrodeposition coating and the case of the spray coating. Further, the change of the above-mentioned processing conditions includes a processing operation for ending the work of electrodeposition or spray coating, that is, a work to be processed or a work group of the same type is a final work on the work day. Or when it is the last work group of the same type,
After the work or the work group of the same type has passed through the pre-treatment area, immediately stop the operation of each equipment such as the degreasing tank, the chemical treatment tank, the cleaning dip tank and the shower device in the pre-treatment area, After the above-mentioned work or a group of works of the same type has passed through the coating area, immediately stop the operation of the entire equipment such as the electrodeposition paint tank or various types of coating machines in the coating area. After the work group has passed through the drying section, a series of processing operations of immediately stopping the operation of the drying furnace in the drying section can be added.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The multi-product continuous coating system according to the present embodiment employs an electrodeposition type in which a work is suspended on a hanger of an overhead conveyor and transported to a series of electrodeposition coating lines (each area for pretreatment, coating and drying). Although the present invention relates to a coating system, the present invention is not limited to a system having a suspended conveyor device, and is also applicable to a multi-product continuous electrodeposition coating system having another type of conveyor device (for example, a floor conveyor). Further, it is needless to say that the present invention is not limited to the electrodeposition coating system but is also applicable to a multi-product continuous spray coating system using a powder coating or a liquid coating.

FIG. 1 schematically shows the configuration of a multi-product continuous coating system according to an embodiment. As shown in the drawing, the present coating system is an electrodeposition coating system, which includes a pretreatment area 1 for performing degreasing / chemical conversion treatment, a coating area 2 for performing electrodeposition treatment of paint,
And a drying section 3 for baking the coating film, and an overhead conveyor as a conveyor, whereby a work such as a home appliance body is first loaded at a position 4 and then suspended on a hanger of the conveyor. The coating system is passed through the pre-treatment zone 1, the coating zone 2 and the drying zone 3 in order to finish the electrodeposition coated product, and then unload at the position 5 (A in the figure, A work path is shown, and an arrow x shows a work transfer direction.) The coating system is used when a plurality of types of workpieces having different processing conditions are continuously conveyed by a conveyor mainly for each group of workpieces of the same type. The pretreatment area 1 is located at the loading position 4 side.
Shower hot water washing device 11, degreasing bath 12, shower water washing device 13, chemical conversion bath 14, shower water washing device 15, ...
A dip rinsing unit 16 and a pure water shower rinsing unit 17 are provided. When the work passes through this area, the surface of the work is degreased following hot water rinsing. Is formed, followed by a series of pretreatments of shower washing, dip washing and finally washing with pure water. In addition, painting area 2
Comprises an electrodeposition paint tank 18 (the upper part of which is covered with a tunnel-type hood), a shower water washing device 19, a dip water washing device 20, and a pure water shower cleaning device 21. The work passes through this area. At this time, a series of electrodeposition processes of forming an electrodeposition coating film of a predetermined thickness on the surface of the work (where a chemical conversion film is formed), followed by shower washing, dip washing, and finally shower washing with pure water. Done. Note that the electrodeposition paint tank 18 is also provided with an overflow tank, a UF device, and the like. Further, the drying section 3 is provided with a tunnel-type drying oven 22, which is divided into a radiant heating zone 23 and a convection heating zone 24 following the radiant heating zone 23. The drying furnace 22 is provided with a hot air generator 25 such as a burner and a fan for heating. Radiation heating zone 2
No. 3 has a heating section m from the work entrance to a predetermined length. Therefore, when the work passes through this area, a baking treatment is performed in which the electrodeposition coating film formed on the work surface is dried by heating and hardened.

As shown in FIGS. 2 and 3, the transporting conveyor 6 used in the present electrodeposition coating system is an overhead conveyor, and its hanger 26 is provided on an upper transporting rail 27 at the upper end of the hanger. It is held by a wheel 28 so as to be movable in an arrow x direction. That is, the work 10 (see FIG. 5) is transported along the work transfer path A while being hung by the hanger 26, and is sequentially subjected to the above-described processes. In this embodiment, the workpiece type indicating member 7 shown in FIGS. 2 and 3 is hung on the hanger 26 at a position immediately before the workpiece or the workpiece group. Travels on the work transport path A. The work type indicating member 7 is a member for indicating the type of work, that is, the type of each work having different shapes, dimensions, surface properties, and the like. A signboard frame 30 for attachment is provided, and a weight 31 is provided below the signboard frame 30 to prevent shaking. The product indicating member 7 hangs the hanging ring portion 32 at the upper end thereof on the hook portion 33 at the lower end of the hanger so that the workpiece conveying path A is suspended on the hanger 26 in the same manner as the work. It can be conveyed along. The kind indicating member 7 can be hung (attached) to the hanger 26 as described above, and can be detached from the hanger 26 for replacement or the like.
Therefore, in the present embodiment, only the preparation of the workpiece type indicating member 7 is sufficient, and the existing conveyor for the electrodeposition coating system need not be modified or modified for the application of the present coating system. be able to.

As shown in FIGS. 2 and 3, the above-mentioned kind display member 7 is provided on both left and right sides of the signboard frame 30 as an appropriate number (usually one) of contact rods 8 as sign elements.
Is mounted so as to extend horizontally to the side. The hitting rods 8 as marking elements are individually attached to one or more of the high, middle, and low portions on the left and right sides of the signboard frame 30 corresponding to each type of work. Has been
The hit rod 8 attached to a certain part is configured to represent a work of a specific type. Therefore, hit rod 8
There are several types of mounting styles, some of which include the last work or the last work group of the same type on the work day. In addition, the signboard frame 30 has a structure in which a mark (a so-called kanban) of a work type composed of characters, symbols, or graphics can be attached at the center thereof. It is also possible to visually confirm the type of the work being actually conveyed.

Further, in this embodiment, a limit switch 9 is provided as a kind discriminating means, and as shown in FIG. 1, each of the pre-treatment area 1, the coating area 2 and the drying area 3 is located before the area on the work loading side. At the position p
For example, as shown in FIG. 5, it is provided at a position slightly before the electrodeposition coating chamber 34. More specifically, FIG.
As shown in FIG. 3, two structural members 35, 35 are provided on both the left and right sides of the transport rail 27 so as to hang down, and below these structural members 35, 35,
A predetermined number of limit switches 9 are attached to the work transfer path A. The limit switch 9 performs an on / off operation by sensing the hitting rod 8 of the marker element, that is, by turning the switch rod 36 into contact with the hitting rod 8 as shown in FIG. It is configured to output an information signal (that is, an electric signal for detecting the arrival of a work or a group of works of the type). In addition, the above “position p before this area” is
At least this corresponds to a work transfer distance corresponding to a work transfer time longer than a time required to complete a change or resetting of processing conditions before the work is carried into the area.

Further, in this embodiment, a control device (not shown) for controlling each of the degreasing / chemical formation, electrodeposition and baking processes for the pretreatment zone 1, the coating zone 2 and the drying zone 3, respectively. A computer control is provided. The control device includes a type determination unit,
That is, the limit switch 9 in each of these areas
And are connected respectively. Therefore, the control device according to the present embodiment determines various conditions required for each of the degreasing / chemical formation, electrodeposition and baking based on the type information signal from each limit switch 9 in addition to the general control of the electrodeposition coating. According to a predetermined program, it is automatically changed or reset. More specifically, in the pretreatment area 1, the operation of the pumps connected to the degreasing tank 12, the chemical conversion tank 14, and the dip washing tank 16 and the operation of the water washing or hot water shower, and the coating area 2, the applied voltage value and the voltage application time when performing the electrodeposition treatment, the operation of the dip washing pump and the operation of the washing shower, and further, in the drying section 3, the drying oven 22. The baking temperature, the drying time, the heating rate, and the like are the targets for changing or resetting the processing conditions. Further, the above-mentioned condition change includes a processing operation for ending the work of electrodeposition coating, that is, a work to be processed or a work group of the same kind is a final work or a final same work group on the work day. When a type information signal indicating that the group is a group of workpieces is input to the control device, the degreasing tank 12 in the area 1 is immediately slid after the workpiece or the group of workpieces of the same type has passed through the pretreatment area 1. The operation of the chemical conversion tank 14 and various cleaning devices is stopped, and then, after the above-mentioned work or a group of works of the same type has passed through the coating area 2, the electrodeposition paint tank 18 and the A series of operations in which the operation of the various cleaning devices is stopped, and then the operation of the drying furnace 22 in the area 3 is stopped immediately after the above-mentioned work or the group of works of the same type has passed through the drying area 3. Management operation has also been added.

Thus, using the above-mentioned electrodeposition coating system, a plurality of types of workpieces 10 having different processing conditions.
Are continuously conveyed mainly by the conveyer 6 for each work group of the same kind, and the pretreatment area 1 and the coating area 2
In the present embodiment, when a workpiece of a certain type or a group of the same type of workpiece is allowed to flow from the loading position 4 to the workpiece transport path A in the case of finishing the electrodeposition-coated product by sequentially passing through the The workpiece type indicating member 7 with the specific hitting rod 8 representing the type is placed at the position immediately before the workpiece or the group of workpieces of the type so that the workpiece type travel member 7 travels on the workpiece transport path A ahead of them. 4
At the hanger 26 of the conveyor 6.
Accordingly, the work type indicating member 7 indicates the type of the succeeding work 10 or the type of the succeeding work group of the same type.
Thereafter, in each of the pretreatment zone 1, the coating zone 2 and the drying zone 3, when the workpiece type indicating member 7 passes at a position in front of the zone on the work loading side, the limit switch 9 sets the workpiece type indicating member 7 to the position. ON / OFF operation by contact with the hit rod 8 attached to the
Then, a predetermined type information signal corresponding to the work type is output. Then, based on the input type information signal, the control device automatically changes or resets the above various conditions necessary for each of the degreasing / chemical formation, electrodeposition and baking processes to ones suitable for the work type. I do. Next, the work 10 sequentially receives these processes under the changed or reset conditions. Then, at the stage when a series of processing is completed, the work 10 is removed from the conveyor 6 at the unloading position 5. Also, the used work type indicating member 7 is reused or, if necessary,
At the receiving position 4, the workpiece is replaced with another workpiece type indicating member.
Therefore, in this embodiment, it is not necessary for the operator himself to manually change or reset the processing conditions of degreasing / chemical formation, electrodeposition and baking.
Good quality electrodeposition products corresponding to individual work types could be produced. And with this automation,
The conditions of the degreasing / chemical formation, electrodeposition, and baking processes can be changed at an appropriate time, so that the consumption of water, electric power, and the like can be significantly reduced, and the UF device and the like can be downsized. I was able to. In addition, the number of workers required for these processes could be significantly reduced. Especially,
The control device performs a series of processes (degreasing / chemical formation, electrodeposition and baking) based on the information signal from the limit switch 9 by passing the workpiece type indicating member 7 representing the final workpiece or workpiece group. Is automatically performed, the operation of each of the sections 1 to 3 of the present electrodeposition coating system can be sequentially terminated without waste, and thus the effect of energy saving can be sufficiently achieved. did it.

Further, the work type indicating member 7 may have a structure in which another marking element can be mounted in place of the hit rod 8. For example, as shown in FIG. 6, the work type indicating member 7 can be configured to form the transmission holes 37 on the left and right side surfaces of the upper part of the signboard frame 30. The transmission holes 37 as marking elements are formed individually corresponding to each type of work, that is, at one or more of the high, middle, and low portions on the left and right sides of the signboard frame 30. The transmission hole 37 formed in a certain portion is configured to represent a work of a specific type. Further, a type of marker element (transmission hole 37) indicating that the work is the last work or the last work group of the same type on the work day is also included. The work type marking member 7 in FIG. 6 has a structure in which a work type mark including characters, symbols, or figures can be attached to the lower part of the signboard frame 30. Other configurations are the same as those of the work type indicating member 7 shown in FIG. In this case, a transmission type photoelectric switch 38 is used instead of the limit switch 9. That is, the light emitted from the light projector 39 of the photoelectric switch 38 is transmitted through the transmission hole 3.
7, the light enters the light receiving sensor 40, and at this time, a kind information signal relating to a specific work kind determined by the formation position of the transmission hole 37 is output. Thereafter, the control device changes or resets predetermined processing conditions in response to the input of the specific type information signal. Therefore, also in this case, the same operation and effect as the above embodiment can be obtained. Further, as shown in FIG.
Can be configured such that a reflection plate 41 is formed as a sign element on the front of the lower part of the signboard frame 30. Reflector 41
Corresponds to each type of work individually, that is, the signboard frame 3
The reflector 41 attached to one or more of the high, middle, and low portions at the front lower part of the 0 is configured to represent a work of a specific type. . Further, a sign element (reflecting plate 41) of a type indicating that it is the last work or the last work group of the same type on the work day is also included. The work type indicator 7 shown in FIG. 7 has a structure in which a work type indicator composed of characters, symbols, or graphics can be attached to the upper part of the signboard frame 30. Other configurations are the same as those of the work type indicating member 7 shown in FIG. In this case, a reflection type photoelectric switch 42 is used instead of the limit switch 9. That is, the light emitted from the projector 39 of the photoelectric switch 42 is reflected by the reflector 41 and enters the light receiving sensor 40. At this time, the type information on the specific work type determined by the mounting position of the reflector 41 It is configured to output a signal. After that, the control device
By inputting a specific type information signal, predetermined processing conditions are changed or reset. Therefore, also in this case, the same operation and effect as the above embodiment can be obtained.

In the above embodiment, the workpiece type indicating member 7 is attached to the conveyor 6 so as to be transported at a position immediately before a workpiece of a certain type or a group of works of the same type. The marking member 7 may be attached to the conveyor 6 so as to be transported at a position immediately after a certain type of work or a group of works of the same type. Work type indication member 7 to be conveyed immediately after the work or work group
Is determined at that time (accurately, at some later time) by the type of discriminating means (limit switch 9 or the like) at which the sign element (the hitting rod 8 or the like) is sensed. Area 1 for all work groups
3 can be indicated as completed.
Therefore, the control device indicates the completion of the passage of the final work or the group of works caused by the passage of the work type indicating member 7 conveyed immediately after the work in the final stage of the electrodeposition coating work on the work day. Based on the information signal, the end operation of a series of processes (degreasing / chemical formation, electrodeposition and baking) can be automatically performed, so that the operation of each of the sections 1 to 3 of the electrodeposition coating system can be performed. Sequentially
It can be terminated without waste, and in this case, too,
The effect of energy saving can be sufficiently achieved.

[0024]

As described above, according to the multi-kind continuous coating system of the present invention, the following effects can be obtained. When continuously transporting multiple types of workpieces with different processing conditions to the required area among the pretreatment area, painting area, and drying area for each group of workpieces of the same type, a certain type of workpiece or a group of Before being transported into each required area, the necessary conditions for each of pre-treatment (degreasing / chemical conversion), electrodeposition or spraying and baking are automatically changed to those suitable for the work type. Alternatively, it can be reset, so that a coated product of good quality corresponding to each work type can be produced. By automatically changing or resetting such processing conditions,
For each of the necessary processes of degreasing / chemical formation, electrodeposition or spraying and baking, the start, end and change of conditions can be performed at an appropriate time, so that the consumption of water, electric power, etc. is significantly reduced. In other words, it is possible to sufficiently achieve energy saving, and further contribute to downsizing of facilities such as UF devices. In addition, the above-described automation can significantly reduce the number of workers required in performing the multi-product continuous coating process, and thus can sufficiently reduce labor costs. Furthermore, the time required to shift from one work type to the next work type can be greatly reduced, and there is no need for the operator to definitely confirm the type of each work, so that overall production (painting) efficiency can be reduced. Improvement can be achieved. In addition, the work type indicator can be attached to and detached from the conveyor as well as the work, and it is only necessary to connect the type discriminating means to the controller for the coating system. There is no need to modify or modify the conveyor for the application of the present invention, and it is possible to make full use of the present invention by simply improving some of the existing control devices. According to this, the existing coating system can be used almost as it is, and therefore, the entire system is simple and inexpensive. Further, by providing the work type indicating member of the present invention, the multi-product continuous coating system can be smoothly operated so as to exhibit various excellent effects as described above.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire multi-product continuous coating system according to an embodiment of the present invention.

FIG. 2 is a front view showing a workpiece type marking member and type determining means used in the coating system of the embodiment.

FIG. 3 is a side view showing a workpiece type indicating member and type identification means of FIG. 2;

FIG. 4 is a diagram showing an operation state of a product type discriminating means shown in FIG. 2;

FIG. 5 is a diagram showing an example of a location where the type determining means shown in FIG. 2 is provided.

FIG. 6 is a front view showing a workpiece type indicating member and type determining means in another embodiment.

FIG. 7 is a front view showing a workpiece type marking member and a type determining means according to still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pre-processing area 2 Painting area 3 Drying area 4 Arrival position 5 Unloading position 6 Conveyor for conveyor 7 Work type indication member 8 Hit rod (marking element) 9 Limit switch (type identification means) 10 Work 11 Shower water washing device 12 Degreasing Treatment tanks 13, 15, 19 Shower washing equipment 14 Chemical conversion treatment tank 16, 20 Dip washing equipment 17, 21 Pure water shower equipment 18 Electrodeposition paint tank 22 Drying furnace 26 Hanger 27 Transport rail 30 Signboard frame 32 Hanging ring part 33 Hook Part 36 Switch rod 37 Transmission hole (marking element) 38, 42 Photoelectric switch (type identification means) 39 Floodlight 40 Light receiving sensor 41 Reflector (marking element) A Work transport path x Work transport direction p Deployment position of type identification means

Claims (2)

[Claims] 1. A plurality of types of workpieces having different processing conditions,
Conveyors are mainly conveyed continuously for each work group of the same product type, and in general, a pretreatment area where degreasing / chemical conversion processing is performed, a coating area where electrodeposition or spraying of paint is performed, and a baking treatment of coating films are performed. In a multi-product continuous coating system that finishes a coated product by sequentially passing it through the required area of the drying area, it can be attached to and detached from the conveyor, and it can be installed immediately before a work of a certain product or a work group of the same product. A workpiece type indicating member capable of mounting a marking element indicating a type of a succeeding work or a type of a subsequent work group of the same type, and a workpiece loading side for each of the required areas. Is arranged at a position in front of the corresponding area, and when the workpiece type indicating member passes, the type information is sensed by the sign element. A type discriminating means for outputting a signal, and controlling a processing process in each of the required areas, and changing various conditions required for these processes based on a kind information signal from the connected type discriminating means. Or a control device for resetting, a multi-product continuous coating system characterized by comprising: 2. The workpiece type indicating member according to claim 1.