JP2006257547A - Electrodeposition coating apparatus, electrodeposition coating method and electrodeposition coating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeposition coating apparatus having a conveyance pipe for transporting small parts to be electrodeposition-coated shortened in a length direction; an electrodeposition coating method; and an electrodeposition coating system. <P>SOLUTION: The electrodeposition coating apparatus 100 is provided with a tank 1 for accommodating an electrodeposition paint 10, an immersion device for immersing an article to be coated into the tank 1, and an application means for applying voltage to the electrodeposition paint 10 and the article to be coated. The immersion device is provided with the conveyance pipe 2 that tilts one end upward to which the coated article is supplied or discharged and the other end downward so as to reach the tank 1, a ribbon screw 2a installed in the conveyance pipe 2, and a rotating device 3 for rotating the conveyance pipe 2. The conveyance pipe 2 has an inner pipe 21 through which the article to be coated freely falls towards the other end, and an outer pipe 22 located on a concentric circle of the inner pipe 21. The ribbon screw 2a is installed between the inner pipe 21 and the outer pipe 22, and transports the coated article to the one end by being driven by the rotating device 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeposition coating apparatus, an electrodeposition coating method, and an electrodeposition coating system. In particular, the present invention relates to an electrodeposition coating apparatus, an electrodeposition coating method, and an electrodeposition coating system that are suitably used for electrodeposition coating of small parts (small parts) such as bolts and washers.

  Electrodeposition painting applies the action of electrophoresis to painting. Electrodeposition coating provides a uniform and excellent anti-corrosion coating even when the object to be coated has a complex shape, and is highly safe because it uses water-based paint. Widely adopted. In recent years, electrodeposition coating has come to be used not only for automobile bodies but also for coating small parts such as bolts and washers, taking advantage of electrodeposition coating.

  As an apparatus for electrodeposition coating of such small parts, a bath made of a conductive liquid coating material is conductively connected to one pole (cathode or anode) of a DC power source, and a small part to be coated is connected to the other side of the DC power source. An electrolytic coating apparatus (electrodeposition coating apparatus) that is conductively connected to an electrode (anode or cathode) is disclosed (for example, see Patent Document 1).

  The electrodeposition coating apparatus disclosed in Patent Document 1 includes a screw conveyor having a supply hole and a discharge hole at both ends of a conveyance pipe and having a conveyance screw inside the conveyance pipe, and is provided on the inner surface of the conveyance pipe. The conductive contact is connected to the cathode of the DC power source, and a part of the cross section of the screw conveyor is connected to the anode of the DC power source and enters the immersion bath containing the coating material.

  And the immersion tank is provided under the conveyance direction front end of a conveyance pipe, and is extended over a part of length of the conveyance pipe from the range located in front of the supply hole of a small component at a distance. Furthermore, the front edge and side edge of the immersion tank form a weir edge of the bath of the coating material, and the conveying screw of the screw conveyor is configured as a ribbon screw that is fixed in a fin shape on the inner peripheral surface of the conveying tube that is driven to rotate. Has been.

  In the electrodeposition coating apparatus disclosed in Patent Document 1, the dam edge at the rear in the conveying direction is formed by the inner peripheral edge of the ribbon screw, and the filling level of the coating material in the immersion tank is defined by at least a part of the dam edge. Has been. In the range where the trailing edge of the immersion tank forms the rear weir edge in the conveyance direction by the inner peripheral edge of the ribbon screw, it is sealed against the outer wall of the conveyance pipe and comes into contact with the conveyance pipe that follows this contact area in the conveyance direction. An outlet is provided. Then, the conductive small parts, particularly metal parts, are electrolytically coated.

  The electrodeposition coating apparatus according to Patent Document 1 is extremely small and functional, and a large amount of parts to be coated can be processed by a small number of workers with a short residence time.

  Another electrodeposition coating apparatus is an apparatus for electrodeposition coating of small conductive parts, and accepts an immersion bath filled with a conductive liquid coating material (cation or anion) at a specified filling height. An electrodeposition coating apparatus comprising a bath and a transport pipe that is rotatable about an axis, transports small parts in a length direction, has a supply port and a discharge port, and a ribbon screw is arranged on the inner periphery. It is disclosed (for example, see Patent Document 2).

  In the electrodeposition coating apparatus disclosed in Patent Document 2, the transport pipe is arranged in relation to the bath as follows. The transport pipe has a paint area extending in the length direction. The transport tube is partially immersed so that it is below the prescribed filling height of the bath. And the 1st electrode is connected to one pole of a power supply, and the 1st electrode is arranged inside the painting field of a conveyance pipe. The second electrode is connected to the other pole of the power source.

The electrodeposition coating apparatus disclosed in Patent Document 2 is characterized in that the second electrode is disposed in the coating region of the transfer tube submerged in a bath filled with a specified filling height. And the electrodeposition coating apparatus by patent document 2 says that the coating quality of a small component can be improved by this intended arrangement | positioning of two electrodes.
Japanese Patent No. 2613173 International Publication No. 00/50670 Pamphlet

  However, the electrodeposition coating apparatus disclosed in Patent Documents 1 and 2 transports small parts to be electrodeposited in the longitudinal direction (axial direction) of a transport pipe that rotates. About half of the length of the transport pipe from the supply port in the length direction is an electrodeposition coating region, and the other half reaching the discharge port only transports the small electrodeposition-coated parts. If the entire length direction of the transfer pipe is the electrodeposition coating region, the transfer pipe can be shortened and the electrodeposition coating apparatus can be downsized.

  In addition, the electrodeposition coating apparatus disclosed in Patent Documents 1 and 2 accepts an immersion tank in which the transport pipe partially sinks into the conductive liquid coating material and a conductive liquid coating material filled in the immersion tank. A separate bath (tank) is provided. Without placing two immersion baths and baths, if there is one tank that fills the conductive liquid coating material like a general electrodeposition coating tank, not only can the electrodeposition coating apparatus be simplified, It is also possible to reduce the size of the electrodeposition coating apparatus.

  The present invention has been made in view of such problems, and it is possible to shorten the length of a transport pipe for electrodeposition coating of a small part in the course of transport, and to form a conductive liquid coating material (electrodeposition). It is an object of the present invention to provide a simplified electrodeposition coating apparatus, electrodeposition coating method, and electrodeposition coating system in which only one tank is required to fill the paint).

  In order to satisfy the above-mentioned object, the inventor has a double pipe structure consisting of a concentric double structure of an inner pipe and an outer pipe for transporting a small part as an object to be coated. A ribbon screw that freely falls in one axial direction and transports small parts in the other axial direction between the inner pipe and the outer pipe is provided, and the small parts supplied to the inner pipe are discharged from the outer pipe. The transport pipe was inclined and partially submerged in the electrodeposition tank, and the following new electrodeposition coating apparatus, electrodeposition coating method, and electrodeposition coating system were invented.

  (1) An electrodeposition coating apparatus comprising: a tank in which an electrodeposition paint is accommodated; an immersion apparatus that immerses the object to be coated in the tank; and an application unit that applies a voltage to the electrodeposition paint and the object to be coated. The dipping device is inclined downward from one end side toward the other end side, the other end side reaches the tank, and a conveying pipe through which the coating object is supplied or discharged to the one end side, A ribbon screw provided inside the conveying pipe; and a rotating device that rotates the conveying pipe. The conveying pipe includes an inner pipe in which the object to be coated freely falls to the other end side, and an inner pipe of the inner pipe. An electrodeposition coating apparatus having an outer tube positioned concentrically, and the ribbon screw being provided between the inner tube and the outer tube to convey the object to be coated to one end side by driving the rotating device .

  In general, an electrodeposition coating apparatus immerses a coating object in an electrolytic solution in which a coating material for electrodeposition coating is dispersed or dissolved in water, and applies a voltage between the coating object and an electrode to pass a current. Then, a coating film of the electrodeposition paint is formed on the surface of the object to be coated.

  In general, electrodeposition coating is also referred to as electrophoretic coating. When an electric current is passed through the electrolytic solution, the cation particles in the electrolytic solution move to the cathode and the anionic particles move to the anode. It is said that this is applied to painting. In general, electrodeposition coating is performed by immersing a metallic object (in the case of the present invention, for example, a metallic small part) in a tank containing an electrodeposition coating material dispersed or dissolved in water. When a voltage (100 to 300 V) is applied between the electrode and the electrode and a current is passed for about 2 to 3 minutes, the action of electrophoresis, electrocoagulation, electroosmosis, and electrolysis works, and uniform water is applied to the surface of the object to be coated. An insoluble coating film is formed (Painting Dictionary 1st Edition: Editor, Color Material Association: Quoted from “Electrodeposition Coating”).

  In general, a coating for electrodeposition coating is said to be a water-soluble resin coating for electrodeposition or a water-based resin coating for electrodeposition. A water-soluble or water-dispersible resin is used as a binder (color developing material), and a positive or negative charge is contained in the binder. It is a water-based paint containing a particle component composed of a resin component having a pigment and a pigment. In general, a paint is put in a tank, a conductive object to be coated (in the case of the present invention, for example, a small conductive part) is immersed, and the object to be coated is charged with one electrode and the tank as a counter electrode. The particle component is moved and deposited on the surface of the object to be coated by liquid flow and electrophoresis by “stirring” (same as above, quoted from the section of coating terminology: “water-soluble resin coating for electrodeposition”).

  In the electrodeposition coating apparatus of the invention according to (1), the electrodeposition paint may be an anion type or a cation type. For example, in the anionic form, a polycarboxylic acid resin may be used as the base resin, and a neutralized and water-solubilized one with a base such as an amine may be used. As the cationic form, a polyamine resin neutralized with an organic or inorganic acid and water-solubilized may be used.

  The electrodeposition coating apparatus of the invention according to (1) includes a tank in which the electrodeposition paint is accommodated. This tank may be a tank filled with an electrolytic solution containing an electrodeposition paint, and may be a tank in which the electrolyte solution is controlled at a certain concentration, temperature, and pH, and a tank in which the electrodeposition paint is circulated. It may be.

  The electrodeposition coating apparatus of the invention according to (1) includes an immersion apparatus for immersing an object to be coated in a tank. The dipping device includes a conveyance tube, a ribbon screw, and a rotation device. The transport pipe is inclined downward from one end side toward the other end side, the other end side reaches the tank, and the object to be coated is supplied or discharged to the one end side. The ribbon screw is provided inside the transport pipe. The rotating device rotates the transport pipe.

  In the present invention, the object to be coated may be a small part such as a bolt or a washer. To immerse the object to be coated in the tank may mean that the transport pipe through which the object is supplied or discharged is immersed in the electrodeposition paint in the tank. In the present invention, although the conveyance pipe depends on the inclination angle, at least half of the conveyance pipe and about 80% can be immersed in the tank. And the immersion part of a conveyance pipe | tube, ie, the path | route of the to-be-coated object in an inner tube | pipe and an outer pipe | tube, can be used as a coating area | region.

  For example, a screw conveyor is defined as a device that attaches a screw to a cylindrical container and sequentially transports objects by rotating the screw. Generally, screw conveyors are used for transporting fluids, powders, earth and sand, etc., but small parts can also be transported as objects to be coated as in the present invention. In order to sequentially transport small parts, the screw is most preferably a ribbon screw having a continuous spiral surface.

  In the electrodeposition coating apparatus of the invention according to (1), the transport pipe has an inner pipe in which an object to be coated freely falls to the other end side, and an outer pipe positioned on a concentric circle of the inner pipe. The ribbon screw is provided inside the transport pipe. The ribbon screw is provided between the inner tube and the outer tube, and conveys the object to be coated to one end side by driving a rotating device. In addition to the gap between the inner tube and the outer tube, a ribbon screw having a progressive blade can be provided inside the inner tube. In this case, the ribbon screw between the inner tube and the outer tube has a reverse feed blade.

  Here, it can also be said that the transport pipe has a double pipe structure composed of a concentric double structure of an inner pipe and an outer pipe. It can also be said that the ribbon screw is composed of ribbon-shaped feed blades.

  Here, the inner tube and the outer tube are rigid tubes and have conductivity. The inner tube and the outer tube are preferably weldable metal tubes. The ribbon screw is preferably a metal plate that is conductive and can be welded. And the outer periphery of an inner tube and the inner periphery of an outer tube are welded with a ribbon screw, and a conveyance tube can be made into the double tube structure which consists of a concentric double structure of an inner tube and an outer tube. Further, the outer periphery of the inner tube and the inner periphery of the outer tube are welded with a ribbon screw, and the conveying tube can be made into a conductor in which the inner tube, the outer tube and the ribbon screw are integrated.

  In the electrodeposition coating apparatus of the invention according to (1), a ribbon screw is provided between the inner tube and the outer tube, and a plurality of objects to be coated discharged from the inner tube are conveyed from the other end side to one end side, A plurality of objects to be coated are discharged from the outer tube.

  Both ends of the inner tube are open, and the tube end on one end side is used as a supply port for supplying a plurality of components, and the other tube end is used as a discharge port for discharging a plurality of components. Here, the fact that a plurality of articles to be freely dropped to the other end side of the inner tube means that the objects to be coated are sequentially slid from the supply port to the discharge port of the inner tube.

  On the other hand, transporting the object to be coated to the other end means that the object is sequentially transported toward the outlet of the outer tube. In other words, the object to be coated, which sequentially proceeds from the supply port to the discharge port of the inner tube, is transferred to the outer tube, folded back, and directed toward the supply port of the inner tube as a direction, and as a route. Go backwards in the tube.

  In order to transfer the small parts from the inner tube to the outer tube, a predetermined interval is provided between the tube end on the discharge port side of the inner tube and the tube end facing the discharge port of the outer tube. You may seal the said pipe end so that a small component may not discharge | emit from the pipe end facing the discharge port of an outer tube. Sealing the tube end may include a form of closing with a porous plate or a mesh plate as described later. Moreover, you may include the form which dams the circumference | surroundings of the said pipe | tube end with the ring-shaped disc.

  In the electrodeposition coating apparatus of the invention according to (1), the transport pipe is inclined downward from one end side toward the other end side, the other end side reaches the tank, and the object to be coated is supplied or discharged to the one end side. The In other words, the transport pipe is inclinedly arranged with the pipe end on one end side of the transport pipe as the upper side and the pipe end on the other end side of the transport pipe as the lower side. Then, the inclined transport pipe is immersed in the tank.

  Here, the pipe end on one end side in the transport pipe is, for example, a discharge port of the outer tube and a supply port of the inner tube. On the other hand, the pipe end on the other end side of the transport pipe is, for example, a discharge port of the inner tube and a supply port of the outer tube. And it may include a mode in which the supply port of the inner tube and the discharge port of the outer tube coincide with each other at a cut perpendicular to the axial direction, and a mode in which the supply port of the inner tube protrudes from the discharge port of the outer tube. It is preferable that the supply port of the inner tube protrudes from the discharge port of the outer tube.

  The rotating device that rotates the transfer tube may be a rotating device that can control the rotation of the transfer tube around the axis. The rotating device includes at least a rotating body (preferably a motor). For example, the rotating body and the transport pipe may be directly connected to rotate the transport pipe, and the rotating body and the transport pipe may be connected by friction transmission. The conveyance pipe may be rotationally controlled, the rotary body and the conveyance pipe may be connected by a gear train, and the conveyance pipe may be rotationally controlled. The rotation body and the conveyance pipe may be coupled by winding transmission to be conveyed. May be rotationally controlled. The case where the rotation of the transfer pipe can be controlled includes, for example, the case where the transfer pipe can be rotated forward and reverse, and the case where the rotation speed of the transfer pipe can be changed. The rotation of the transfer pipe can be stopped (emergency stop) May be included.

  The electrodeposition coating apparatus of the invention according to (1) includes an application means for applying a voltage to the electrodeposition paint and the object to be coated. The application means may include a DC power source, and as will be described later, a first electrode that contacts the carrier tube and is connected to one pole of the DC power source, and the other pole of the DC power source immersed in the tank. A second electrode connected to the first electrode.

  The conveying pipe according to the present invention has a double structure of an inner pipe and an outer pipe. By rotating the conveying pipe, the object to be coated supplied to the inner pipe is conveyed from one end side to the other end side by free fall. After being transferred to the tube, the article to be coated is reversely moved by the ribbon screw formed on the outer tube. That is, it is possible for the length direction of the transfer pipe to be the electrodeposition coating region, and the transfer pipe can be shortened as compared with the conventional electrodeposition coating apparatus. And it becomes possible to miniaturize an electrodeposition coating apparatus.

  (2) The application means includes a first electrode that contacts the transport pipe and is connected to one pole of a DC power supply, and a second electrode that is immersed in the tank and connected to the other pole of the DC power supply. The electrodeposition coating apparatus according to (1).

  In the electrodeposition coating apparatus according to the invention of (2), the applying means includes a first electrode that contacts the transport pipe and is connected to one pole of the DC power source. As described above, the transport pipe according to the present invention has a double pipe structure including a concentric double structure of an inner pipe and an outer pipe. Therefore, the first electrode may be brought into contact with the outer periphery of the outer tube, the inner tube may be protruded from the outer tube, and the first electrode may be brought into contact with the outer periphery of the protruded inner tube. The first electrode may be in sliding contact with the inner tube or the outer tube as a cantilever contact, and the first electrode may be in sliding contact with the inner tube or the outer tube as a brush electrode. And the to-be-coated object which contacts a conveyance pipe can be made into one pole.

  In the electrodeposition coating apparatus of the invention according to (2), the applying means includes a second electrode that is immersed in the tank and connected to the other pole of the DC power source. The object to be electrically connected to the first electrode is used as one pole, and the second electrode attached to the tank is used as a counter electrode. When the first electrode is used as an anode and the second electrode is used as a cathode, a small object to be coated in the transport pipe is immersed in the electrodeposition paint in the tank, and a voltage is applied, whereby the object to be coated can be subjected to anion electrodeposition. On the other hand, if the first electrode is used as a cathode, the second electrode is used as an anode, and the object to be coated in the transport pipe is immersed in the electrodeposition paint in the tank and a voltage is applied, the object to be coated can be cationic electrodeposition.

  (3) On the contact surface of the coating object on the inner peripheral surface of the outer tube, a plurality of ridges on which the coating object makes point contact or line contact are regularly provided (1) or (2 ) Electrodeposition coating equipment as described.

  The conveying pipe according to the present invention is a conductor that contacts the object to be coated. Therefore, the surface on which the transport pipe is immersed with the electrodeposition paint is electrodeposited. And this electrodeposition film | membrane is formed with a to-be-coated object, and a to-be-coated object may adhere to the surface of a conveyance pipe. In order to prevent this adhesion, the present invention regularly provides a plurality of protrusions on the contact surface of the coating object on the inner peripheral surface of the outer tube so that the coating object makes point contact or line contact. .

  Examples of the plurality of ridges that make point contact or line contact include ridges having a mountain-shaped cross section. The tip portions of these mountain-shaped ridges have the advantage that it is difficult to form an electrodeposition film, and it is difficult to adhere to an object to be coated. Providing a plurality of protrusions regularly means, for example, appropriately setting the interval between the protrusions depending on the shape of the object to be coated.

  For example, a plurality of ridges can be formed by cutting the inner peripheral surface of the outer tube. Alternatively, a plurality of ridges may be regularly provided on the ribbon screw by welding a ribbon screw on which a plurality of ridges are formed in advance to the inner tube or the outer tube.

  (4) The pipe end on the other end side of the transport pipe is closed with a porous plate or a mesh plate through which the object to be coated does not pass but through which the electrodeposition coating material can flow. (1) to (3) The electrodeposition coating apparatus according to any one of the above.

  In the electrodeposition coating apparatus of the invention according to (4), the tube end on the other end side of the transport tube is closed with a porous plate or a mesh plate so that the electrodeposition paint can be easily immersed in the transport tube.

  (5) The inner tube and the outer tube are provided with a plurality of holes through which the electrodeposition coating material can flow though the object to be coated does not pass. Dressing equipment.

  In addition to the invention according to (4), the electrodeposition coating apparatus according to the invention according to (5) is further provided with a plurality of holes in the inner tube and the outer tube so that the electrodeposition paint can be easily immersed in the transport tube. For example, the inner tube and the outer tube may be formed into a cylinder with a perforated plate, and a plurality of holes may be provided, or a plurality of holes may be provided at appropriate positions of the inner tube and the outer tube.

  (6) A slide in which a pipe end on one end side of the inner pipe is extended and protrudes from a pipe end on one end side of the outer pipe, and the extension part freely drops the article to be coated. The electrodeposition coating apparatus according to any one of (1) to (5), which forms a path.

  The electrodeposition coating apparatus of the invention according to (6) may be an extension part in which the inner pipe is extended to form a runway, and another pipe body having the same diameter as the inner pipe is connected to the inner pipe. And it is good also as an extension part. This extended portion does not become a coating region, and the object to be coated slides, or there is a mode in which the electrodeposition paint is introduced as described above. Therefore, it is not preferable to provide a plurality of holes.

  (7) A support base that rotatably insulates and supports the extension part is provided, and the first electrode is a brush electrode that is insulatively supported by the support base and is in sliding contact with the outer periphery of the extension part (6 ) Electrodeposition coating equipment as described.

  For example, if the extension part is supported by rolling with a plurality of insulating rollers so as to surround the outer periphery of the extension part, the extension part can be insulated and supported in a rotatable manner. The support base may be provided with a mechanism capable of arbitrarily changing the inclination angle of the transport pipe continuous with the extending portion.

  (8) The electrodeposition coating apparatus according to (7), further comprising a vibration motor that is provided on the support base and transmits vibration to the transport pipe.

  (9) An electrodeposition coating method in which an electrodeposition paint is accommodated in an accommodation means, and an object to be coated is immersed in the accommodation means by an immersion means, and a voltage is applied to the electrodeposition paint and the object to be coated by an application means. The dipping means is inclined downward from one end side toward the other end side, the other end side reaches the housing means, and a conveying means for supplying or discharging the article to be coated to the one end side, and this conveying A ribbon-type blade feeding means provided inside the means, and a rotating means for rotating the conveying means. The conveying means includes an inner tube in which the article to be coated freely falls to the other end side, An outer tube located on a concentric circle of the tube, and the ribbon-type blade feeding means is provided between the inner tube and the outer tube, and conveys the article to be coated to one end side by driving the rotating means. Electrodeposition coating method to do.

  The storage means includes a tank that fills the electrolytic solution containing the electrodeposition paint, and the electrolyte solution may be a tank in which a certain concentration, temperature, and pH are controlled, and even if the electrodeposition paint is circulated. Good. The dipping means can include a dipping apparatus including a transport tube, a ribbon type blade feeding means, and a rotating device. The conveying means may include a conveying pipe, and the ribbon type blade feeding means may include a ribbon screw constituted by a ribbon-shaped feeding blade.

  (10) The application unit includes a first electrode and a second electrode, the first electrode is in contact with the transport unit and connected to one pole of a DC power source, and the second electrode is immersed in the storage unit The electrodeposition coating method according to (9), wherein the electrodeposition coating method is connected to the other pole of the DC power source.

  (11) On the contact surface of the coating object on the inner peripheral surface of the outer tube, a plurality of ridges on which the coating object is point-contacted or line-contacted are regularly provided (9) or (10 ) Electrodeposition coating method as described.

  (12) The electrodeposition coating apparatus according to any one of (1) to (7) and a first belt conveyor that transports the coated object discharged from the electrodeposition coating apparatus. An electrodeposition coating system comprising: a first water-washing device, and a heat-drying device arranged on the way of transporting the second belt conveyor that transports the water-washed article passed from the first belt conveyor.

  (13) The electrodeposition coating system according to (12), further comprising a pretreatment device for pretreating the article to be coated before painting.

  Examples of the chemical conversion treatment in the pretreatment of the object to be coated include zinc phosphate chemical conversion treatment and iron phosphate chemical conversion treatment. In these chemical conversion treatments, it is preferable to adjust the surface as described later. However, in the case of forming a zirconium chemical conversion film, it is generally unnecessary to adjust the surface.

  (14) The pretreatment device includes a degreasing device for degreasing the object to be coated before painting, a second water washing device for washing the object to be degreased by the degreasing device, and a water washing with the second water washing device. Surface adjusting device for surface-adjusting the coated object to be coated, chemical conversion treatment device for chemical conversion treatment of the coated material surface-adjusted by the surface conditioning device, and the coating material chemical-treated by the chemical conversion treatment device A third water-washing device for washing water, transporting the object to be coated before coating to the electrodeposition coating device, the degreasing device, the second water-washing device, the surface conditioning device, the chemical conversion treatment device, and the third The electrodeposition coating system according to (13), including a third belt conveyor in which a water washing device is arranged in series in the transport direction of the article to be coated.

  In the electrodeposition coating system according to the invention of (14), the pretreatment device comprises a degreasing device, a second water washing device, a surface conditioning device, a chemical conversion treatment device, a third water washing device, and a third belt conveyor. Contains. The degreasing device degreases the object to be coated before painting. A 2nd water washing apparatus wash | cleans the to-be-coated object degreased | defatted with the degreasing apparatus. The surface adjusting device adjusts the surface of the article washed with the second water washing device. The chemical conversion treatment device performs chemical conversion treatment on the object whose surface is adjusted by the surface adjustment device. A 3rd water washing apparatus wash | cleans the to-be-coated material which was subjected to chemical conversion treatment with the chemical conversion treatment apparatus.

  The third belt conveyor transports an object to be coated before painting to an electrodeposition coating apparatus. And the 3rd belt conveyor has arrange | positioned the degreasing | defatting apparatus, the 2nd water washing apparatus, the surface adjustment apparatus, the chemical conversion treatment apparatus, and the 3rd water washing apparatus in series in the conveyance direction of a to-be-coated article.

  This pretreatment device can also include a lifter arranged at the rear stage of the third belt conveyor and a parts feeder arranged at the front stage of the electrodeposition coating apparatus. Here, the lifter transfers the pre-processed object to the parts feeder. The parts feeder is preferably vibrated, and sequentially conveys a plurality of objects to be coated to the electrodeposition coating apparatus.

  The degreasing device removes rust preventive oil applied for the purpose of preventing the occurrence of rust on the surface of an object to be coated, and an oily substance applied during press molding. Examples of degreasing include alkali degreasing, acid degreasing, and emulsion degreasing. In alkaline degreasing, the surface of an object to be coated is degreased using an alkaline degreasing agent mainly composed of an alkali builder (base) and a surfactant. Acid degreasing degreases the surface of an object to be coated using an acidic cleaning agent. Emulsion degreasing degreases the surface of an object to be coated using an emulsion (emulsified liquid) mainly composed of a solvent and a surfactant.

  Next, a 2nd water washing apparatus washs off the degreasing agent adhering to the to-be-coated article surface with a degreasing apparatus. For example, this 2nd water washing apparatus can also be included in a degreasing apparatus as a degreasing water washing apparatus.

  Next, the surface conditioner will improve the film formation in the next step by immersing or spraying the degreased and washed object in the surface conditioner to obtain fine, dense and high quality film crystals. And

  Next, the chemical conversion treatment device forms a chemically non-metallic chemical conversion coating on the surface of the object whose surface has been adjusted by the surface adjustment device. As the treatment agent, steel includes zinc phosphate, iron phosphate and zirconium. Salt is used. Treatment methods include a spray method and an immersion method. The chemical conversion treatment has an effect of increasing the rust prevention power of the object to be coated and the adhesion of the coating film together with the coating film.

  Next, a 3rd water washing apparatus wash | cleans the to-be-coated material which was subjected to chemical conversion treatment with the chemical conversion treatment apparatus. For example, this 3rd water washing apparatus is equipped with the water-washing apparatus of the front | former stage which wash | cleans a chemical conversion treatment agent, and the water-washing apparatus of the back | latter stage which wash | cleans a chemical conversion film surface.

  In the electrodeposition coating apparatus according to the present invention, the transport pipe has a double structure of an inner pipe and an outer pipe, and by rotating the transport pipe, the object supplied to the inner pipe is transported in one axial direction by free fall. After being transferred to the outer tube, the article to be coated is reversely advanced by a ribbon screw formed on the outer tube. The electrodeposition coating apparatus according to the present invention enables the entire length direction of the transport pipe to be an electrodeposition coating region, and can shorten the transport pipe as compared with the conventional electrodeposition coating apparatus. And it becomes possible to miniaturize an electrodeposition coating apparatus. It is also possible to reduce the size of the electrodeposition coating system.

  In the conveying pipe according to the present invention, a plurality of ridges that are point-contacted or line-contacted with the coating object are regularly provided on the surface of the path through which the coating object is transported. Adhesion with an electrodeposition film can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view showing an embodiment of an electrodeposition coating apparatus according to the present invention, in which a transport pipe, a tank, and a support base are in a longitudinal section. FIG. 2 is a front view of the electrodeposition coating apparatus according to the embodiment, in which the upper half of the transport pipe and the tank are in a longitudinal section. FIG. 3 is an A arrow view of the electrodeposition coating apparatus according to the embodiment, and a part of the support base is a cross section. FIG. 4 is a cross-sectional view of a main part of the transport pipe according to the embodiment.

  FIG. 5 is a front view showing an embodiment of an electrodeposition coating system including the electrodeposition coating apparatus according to the embodiment. FIG. 6 is a plan view of the electrodeposition coating system according to the embodiment. FIG. 7 is a view of the electrodeposition coating system according to the embodiment as viewed from the pretreatment device side.

  In FIG. 1, an electrodeposition coating apparatus 100 includes a tank (accommodating means) 1 in which an electrodeposition paint 10 is accommodated, an immersion device (immersion means) for immersing an object to be coated in the tank 1, an electrodeposition paint 10 and an object to be coated. Applying means for applying a voltage to the coating. The dipping device includes a transport pipe (transport means) 2, a ribbon screw (ribbon type blade feed means) 2 a, and a rotating device (rotating means) 3. The transport pipe 2 is inclined downward from one end side toward the other end side, and the other end side reaches the tank 1. Then, the object to be coated is supplied to or discharged from one end side of the transport pipe 2. The ribbon screw 2 a is provided inside the transport pipe 2. The rotating device 3 rotates the transport pipe 2.

  In FIG. 1 or FIG. 2, the tank 1 is filled with an electrodeposition paint 10 in which a paint for electrodeposition coating is dispersed or dissolved in water. The coating for electrodeposition coating may be anionic or cationic. The electrodeposition paint 10 in the tank 1 is managed at a constant concentration, temperature, and pH.

  More specifically, as shown in FIG. 1 or FIG. 2, the tank 1 includes an immersion tank 11 filled with the electrodeposition paint 10 and an overflow weir 12 that receives the electrodeposition paint 10 overflowing from the immersion tank 11. Has been. The electrodeposition paint 10 in the overflow weir 12 is transported to the immersion tank 11 by the pump 13. In FIG. 1 or FIG. 2, the piping between the pump 13 and the immersion tank 11 is not shown, and the path connected by the symbol L is indicated by an arrow.

  1 or 2, the transport pipe 2 has a ribbon screw 2a provided therein. When the transport pipe 2 is rotated around its axis, the transport pipe 2 functions as a screw conveyor, and a plurality of covered pipes are provided in the axial direction. A coating (hereinafter referred to as a small part) can be conveyed. The transport pipe 2 has an inner pipe 21 in which a small part freely falls to the other end side and an outer pipe 22 positioned on a concentric circle of the inner pipe 21. The transport pipe 2 has a double pipe structure composed of a concentric double structure of an inner pipe 21 and an outer pipe 22. The ribbon screw 2a is a ribbon screw-shaped feed blade.

  The inner tube 21 and the outer tube 22 are rigid tubes and have conductivity. The inner tube 21 and the outer tube 22 are formed of weldable metal tubes. The ribbon screw 2a has conductivity and is formed of a weldable metal plate. Examples of the material of the component of the transport pipe 2 include iron, stainless steel, copper, and aluminum alloy.

  The outer periphery of the inner tube 21 and the inner periphery of the outer tube 22 are welded with a ribbon screw 2 a, so that the transport tube 2 has a double tube structure composed of a concentric double structure of the inner tube 21 and the outer tube 22. Further, the outer periphery of the inner tube 21 and the inner periphery of the outer tube 22 are welded by a ribbon screw 2a, and the conveying tube 2 is made a conductor in which the inner tube 21, the outer tube 22 and the ribbon screw 2a are integrated.

  In FIG. 1, both ends of the inner tube 21 are open. One tube end is used as a supply port 21a for supplying a plurality of components, and the other tube end is used as a discharge port 21b for discharging a plurality of components. Yes. In the present invention, the fact that a plurality of small parts freely fall to the other end side of the inner pipe means that the small parts are sequentially slid from the supply port 21a of the inner pipe 21 toward the discharge port 21b. Since the transport pipe 2 is inclined, the small parts are guided to the inner wall of the inner pipe 21 and sequentially move toward the discharge port 21b.

  On the other hand, in the present invention, transporting small parts from the other end side to one end side means that small parts are sequentially transported toward the outlet 22b of the outer tube 22. The small parts that move sequentially from the supply port 21a of the inner tube 21 toward the discharge port 21b are transferred to the outer tube 22, turned back, and directed toward the supply port 21a of the inner tube 21 as a path. Travels backward through the outer tube 22. In other words, when the transport tube 2 is rotated, the small parts are sequentially guided to the inner wall of the outer tube 22 and the ribbon screw 2a and sequentially move toward the discharge port 22b.

  In FIG. 1 or FIG. 2, in order to transfer a small part from the inner tube 21 to the outer tube 22, the tube end on the discharge port 21 b side of the inner tube 21 and the tube end 22 a facing the discharge port 22 b of the outer tube 22 are A predetermined interval is provided. The tube end 22a is sealed so that a small part is not discharged from the tube end 22a facing the discharge port 22b of the outer tube 22. The tube end 22a is closed with a perforated plate or a mesh plate through which the electrodeposition paint 10 can flow though small components do not pass. In addition, the inner tube 21 and the outer tube 22 may be provided with a plurality of holes through which the small-sized components do not pass but through which the electrodeposition paint 10 can flow.

  As shown in FIG. 1 or FIG. 2, the transport pipe 2 is inclined downward from one end side toward the other end side, and the other end side reaches the tank 1. The transport pipe 2 is inclined with the pipe end 22b on one end side as the upper side and the pipe end 22a on the other end side as the lower side. The inclined transport pipe 2 is immersed in the tank 1. The tube ends on one end side of the transport tube 2 are a supply port 21 a of the inner tube 21 and a discharge port 22 b of the outer tube 22. On the other hand, the other end of the transport tube 2 is a tube end 22 a facing the discharge port 22 b of the outer tube 22. 1 or 2, the supply port 21a of the inner tube 21 protrudes from the discharge port 22b of the outer tube 22, but the supply port 21a of the inner tube 21 and the discharge port 22b of the outer tube 22 are orthogonal to the axial direction. It may coincide with the cut end.

  That the above-mentioned conveyance pipe 2 is immersed in the tank 1 is synonymous with that the conveyance pipe 2 is immersed in the electrodeposition paint 10 in the tank 1. Although the conveyance pipe 2 depends on the inclination angle, at least half of the conveyance pipe 2 and about 80% can be immersed in the tank 1. And the immersion site | part of the conveyance pipe 2, ie, the channel | path of the inner tube 21 and the outer tube | pipe 22, in a small component, becomes a coating area | region.

  The transport pipe 2 according to the present invention has a double structure of an inner pipe 21 and an outer pipe 22, and small parts supplied to the inner pipe 21 are transported from one end side to the other end side by free fall and delivered to the outer pipe 22. After that, the small parts are moved backward by the ribbon screw 2 a formed in the outer tube 22. That is, it is possible for the substantially entire length direction of the transport pipe 2 to be the electrodeposition coating region, and the transport pipe can be shortened as compared with the conventional electrodeposition coating apparatus. And it becomes possible to miniaturize an electrodeposition coating apparatus.

  The electrodeposition coating apparatus 100 according to the present invention includes a second electrode (not shown) that is immersed in the tank 1 and connected to the other pole of the DC power supply. A small component that is electrically connected to the first electrode 4a is used as one electrode, and a second electrode attached to the tank 1 is used as a counter electrode. If the first electrode 4a is used as an anode, the second electrode is used as a cathode, a small component in the transport tube 2 is immersed in the electrodeposition paint 10 in the tank 1, and a voltage is applied, the small component can be subjected to anion electrodeposition coating. On the contrary, the first electrode 4a is used as a cathode, the second electrode is used as an anode, a small component in the transport tube 2 is immersed in the electrodeposition paint 10 in the tank 1, and a small voltage is applied to the small component by applying a voltage. Can be painted.

  In FIG. 1 or FIG. 2, the supply port 21 a of the inner tube 21 is connected to another tube body having the same diameter as the inner tube 21, thereby forming the extending portion 23. The tube end of the extending portion 23 is open and serves as a supply port 23a through which small components are supplied. Small parts are sequentially fed from the hopper 24 to the supply port 23a. Then, the small component slides inside the extending portion 23 and reaches the inner tube 21. It may be said that the extending part 23 forms a runway.

  Moreover, the conveyance pipe | tube 2 by this invention is regularly provided with the several protruding item | line with which a small component carries out a point contact or a line contact in the contact surface of the small component in the inner peripheral surface of the outer tube | pipe 22.

  The conveyance tube 2 is a conductor that contacts small parts. Therefore, the surface on which the transport pipe 2 is immersed in the electrodeposition paint 10 is electrodeposited. And this electrodeposition film | membrane is formed with a small component, and a small component may adhere to the surface of the conveyance pipe 2. FIG. In order to prevent this adhesion, a plurality of ridges are regularly provided on the contact surface of the small component on the inner peripheral surface of the outer tube 22 so that the small component is in point contact or line contact.

  Examples of the plurality of ridges that make point contact or line contact include a ridge 2j having a mountain range in cross section, as shown in FIG. The tip of these mountain-shaped ridges 2j has the advantage that it is difficult to adhere to small parts in addition to the difficulty of forming an electrodeposition film. Providing the plurality of protrusions 2j regularly means, for example, appropriately setting the interval between the protrusions 2j depending on the shape of the small component.

  As a regular arrangement of the ridges 2j corresponding to small parts having an extremely small shape, a mode in which the ridges 2j are continuous as shown in FIG. In FIG. 4A, the distance S between the vertices of the ridge 2j is 2 mm, the height δ of the ridge 2j is 1.73 mm, and the opening angle α of the grooves constituting the ridge 2j is 60 degrees.

  Further, as a regular arrangement of the ridges 2j corresponding to small parts having a minimum or larger shape, an aspect in which the ridges 2j are arranged with a constant interval as shown in FIG. 4B is considered. It is done. In FIG. 4B, the inter-vertex distance S of the ridge 2j is 4 mm. As a regular arrangement of the ridges 2j corresponding to a small component having a larger shape, a mode in which the ridges 2j are arranged with a constant interval is conceivable. In FIG. 4C, the distance 2S between the vertices of the ridge 2j is 8 mm.

  The plurality of ridges 2j shown in FIG. 4 can be formed by cutting the inner peripheral surface of the outer tube 22. Alternatively, the ribbon screw 2a in which a plurality of ridges 2j are formed in advance may be welded to the inner tube 21 or the outer tube 22, and the plurality of ridges 2j may be regularly provided on the ribbon screw 2a. In addition, it is preferable to coat with a coating film other than the contact surface of a small component, since conductivity is not required.

  1 to 3, the electrodeposition coating apparatus 100 includes a support base 5 that insulates and supports the extended portion 23 in a rotatable manner. The support base 5 includes a gantry 51 and a rectangular frame 52. The gantry 51 includes a pair of horizontal legs and a pair of standing legs, and the pair of horizontal legs and the pair of standing legs are reinforced by a hypotenuse frame. The support base 5 is installed on the floor G.

  2 or 3, the rectangular frame 52 is provided with a pair of shafts 53a and 53b that protrude in opposite directions. The pair of shafts 53a and 53b are rotatably connected to the pair of bearings 54a and 54b. The pair of bearings 54a and 54b are supported by the gantry 51 through vibration-proof rubbers 55a and 55b.

  2 or 3, the pair of bearings 54a and 54b are provided with set screws (not shown) for fixing the pair of shafts 53a and 53b. If the set screws are loosened, the horizontal plane is used as a reference. The inclination angle of the transport pipe 2 can be adjusted. If the pair of shafts 53a and 53b are fixed with the set screws, the transport pipe 2 can be held at an arbitrary inclination angle. The inclination angle of the transport pipe 2 can be inclined within an angle range of 5 degrees to 60 degrees with respect to the horizontal plane, and an inclination angle of about 30 degrees is preferable.

  In FIG. 1 or FIG. 2, the vibration motor 6 is attached to the lower part of the rectangular frame 52. When the vibration motor 6 is operated, vibration can be transmitted to the transport pipe 2. The vibration motor 6 is provided in order to prevent small parts from adhering to the inside of the transport pipe 2.

  In FIG. 3, the extending portion 23 is supported by rolling with four insulating rollers (for example, rubber rollers) 56 so as to surround the outer periphery of the extending portion 23. As shown in FIG. 2, the four insulating rollers 56 are arranged in a pair with a certain interval in the axial direction of the extending portion 23.

  The first electrode 4a is a brush electrode that is insulatively supported by the rectangular frame 52 and is in sliding contact with the outer periphery of the extending portion 23. The extending portion 23 to which a voltage is applied to the first electrode 4a is a rectangular frame. Insulating support is provided by an insulating roller 56 provided at 52.

  In addition, a pair of insulating rollers 57a and 57b are in rolling contact with one disk surface of a large-diameter sprocket 33 (see FIG. 1), which will be described later, so that the inclined transport pipe 2 does not move by its own weight ( (See FIG. 2 or FIG. 3). The pair of insulating rollers 57 a and 57 b insulate the extending portion 23 from the rectangular frame 52.

  Next, the configuration of the rotating device 3 will be described. In FIGS. 1 to 3, a motor 31 supported by vibration-proof rubber is provided on the upper portion of a rectangular frame 52. A small-diameter sprocket 32 is attached to the rotation shaft of the motor 31. A large-diameter sprocket 33 is attached to the outer periphery of the extending portion 23. A chain 34 is wound around the small-diameter sprocket 32 and the large-diameter sprocket 33.

  By driving the motor 31, the conveyance tube 2 can be controlled to rotate. Here, the rotation control of the transport pipe 2 may include, for example, a case where the transport pipe 2 can be rotated forward and reverse, and may include a case where the rotation speed of the transport pipe 2 can be varied. The case where rotation stop (emergency stop) is possible may be included.

  Moreover, as an embodiment of the winding transmission device of the present invention, a chain transmission device using a sprocket for a driving vehicle and a driven vehicle and a chain for a winding transmission body is employed. For example, the timing is applied to the driving vehicle and the driven vehicle. A belt transmission device using a pulley and a timing belt as a winding transmission may be considered.

  Next, the electrodeposition coating system according to the present invention will be described.

  5 to 7, the electrodeposition coating system 200 is arranged on the way of transporting the electrodeposition coating apparatus 100 and the first belt conveyor 7 c that transports the small coated parts discharged from the electrodeposition coating apparatus 100. A first water washing device 7 is provided. Further, the electrodeposition coating system 200 includes a heating and drying device 8 that is arranged on the way of transport of the second belt conveyor 8c that transports the washed small parts delivered from the first belt conveyor 7c.

  In FIG. 5, the discharge port 22b of the small parts in the transport pipe 2 is disposed so as to jump out from the tank 1, and the painted small parts discharged from the transport pipe 2 are transported to the first belt conveyor 7c. As shown in FIG. 1 or 2, when the discharge port 22b is immersed in the tank 1, the painted small parts are dropped on the belt conveyor 7v, and then the first belt on the belt conveyor 7v. It is transported to the conveyor 7c.

  The 1st water washing apparatus 7 is provided with the some nozzle 7a and the collection tank 7b, for example. A plurality of nozzles 7a are arranged on the upper and lower portions of the first belt conveyor 7c, and the plurality of nozzles 7a sprays the washing liquid onto the painted small parts during transportation. The collection tank 7b is arrange | positioned at the lower part of the 1st belt conveyor 7c, and collect | recovers used washing | cleaning liquid. These used cleaning liquids may be circulated through a filter.

  The small parts that have been washed are transferred to the second belt conveyor 8c and dried and baked by the hot air drying type heating and drying apparatus 8. The second belt conveyor 8c is configured in three stages, and the path length after drying and baking is substantially ensured, but the lateral width W of the electrodeposition coating system 200 is shortened (see FIG. 5). .

  The electrodeposition coating system 200 according to the present invention is a continuous electrodeposition coating system, and the processes leading to painting of small parts, washing with water, and baking can be performed consistently without human intervention.

  The electrodeposition coating system 200 according to the present invention further includes a pretreatment device 90 for pretreating small parts before painting (see FIGS. 6 and 7). 6 and 7, the pretreatment device 90 includes a degreasing device 91, a second water washing device 92, a surface conditioning device 93, a chemical conversion treatment device 94, a third water washing device 95, and a third belt conveyor 96. , Including.

  6 and 7, a degreasing device 91 degreases small parts before painting. The second water washing device 92 washes the small parts degreased by the degreasing device 91 with water. The surface adjustment device 93 adjusts the surface of the small parts washed with the second water washing device 92. The chemical conversion treatment device 94 performs chemical conversion treatment on the small component whose surface is adjusted by the surface adjustment device 93. The third water washing device 95 washes the small parts subjected to the chemical conversion treatment by the chemical conversion treatment device 94 with water.

  6 and 7, the third belt conveyor 96 transports the small parts before painting to the electrodeposition coating apparatus 100. In the third belt conveyor 96, a degreasing device 91, a second water washing device 92, a surface conditioning device 93, a chemical conversion treatment device 94, and a third water washing device 95 are arranged in series in the transport direction of the small parts.

  The pretreatment device 90 can also include a lifter 97 disposed at the rear stage of the third belt conveyor 96 and a parts feeder 98 disposed at the front stage of the electrodeposition coating apparatus 100 (see FIGS. 5 and 6). 5 and 6, the lifter 97 transfers the small parts that have been preprocessed to the parts feeder 98. As the lifter 97, a commercially available inclined bucket conveyor can be used. A plurality of buckets are attached to the belt of the bucket conveyor. The small parts are sequentially accommodated in the bucket from the third belt conveyor 96 and are put into the hopper of the parts feeder 98 from the bucket inverted at the uppermost stage of the bucket conveyor. The parts feeder 98 is vibrated and sequentially conveys a plurality of small parts to the electrodeposition coating apparatus 100.

  6 and 7, for example, the degreasing device 91 includes a tank 91t in which a degreasing agent is accommodated, and the degreasing agent in the tank 91t is sucked out by the pump 91p and conveyed by the third belt conveyor 96. A degreasing agent is jetted onto the small parts before painting, and the small parts before painting are first degreased. The second water washing device 92 includes a tank 92t in which the cleaning liquid is accommodated, the cleaning liquid in the tank 92t is sucked out by the pump 92p, and the cleaning liquid is ejected to the small degreased parts conveyed by the third belt conveyor 96. The degreasing agent adhering to the surface of the small component is washed away.

  6 and 7, the surface adjustment device 93 includes a tank 93t in which the surface adjustment agent is accommodated, and the surface adjustment agent in the tank 93t is sucked out by the pump 93p and conveyed by the third belt conveyor 96. The surface conditioning agent is jetted onto the small parts after degreasing and cleaning, and the surface of the small parts is adjusted. The chemical conversion treatment device 94 includes a tank 94t in which the chemical conversion treatment agent is accommodated, and the chemical conversion treatment agent in the tank 94t is sucked out by the pump 94p and is transported by the third belt conveyor 96. Then, the chemical conversion treatment agent is ejected and the small parts are subjected to chemical conversion treatment.

  Next, the 3rd water-washing apparatus 95 wash | cleans the small components chemically converted by the chemical conversion apparatus 94. In FIG.6 and FIG.7, the 3rd water washing apparatus 95 is provided with the water-washing apparatus 95a of the front | former stage which wash | cleans a chemical conversion treatment agent, and the water-washing apparatus 95b of the back | latter stage which wash | cleans a chemical conversion film surface. The water washing devices 95a and 95b are provided with tanks 95at and 95bt in which the washing liquid is stored, and after the chemical conversion treatment, the washing liquid in the tanks 95at and 95bt is sucked out by the pumps 95ap and 95bp and conveyed by the third belt conveyor 96. The cleaning liquid is ejected onto the small parts, and the chemical conversion treatment agent adhering to the surface of the small parts is washed away by the water washing device 95a. Further, the chemical conversion coating surface of the small part is cleaned by the water washing device 95b. For the water washing in the water washing apparatus 95b, deionized water is usually used.

  The electrodeposition coating system 200 according to the present invention is a continuous electrodeposition coating system including a pretreatment process, and the processes from painting to small parts starting with pretreatment, water washing, and baking are consistently performed without human intervention. It can be processed.

  For example, the dimensions of the electrodeposition coating system 200 are the width W = 785 cm and the depth D = 270 cm (see FIGS. 5 and 6). The maximum height H of the electrodeposition coating system 200 is 245 cm (see FIG. 5). The input height H1 of the small parts input to the electrodeposition coating apparatus 100 in the electrodeposition coating system 200 is 167 cm (see FIG. 5), and the discharge height H2 of the small parts discharged from the electrodeposition coating apparatus 100 is 73 cm (see FIG. 5). The electrodeposition coating system 200 can be expanded in accordance with these specifications.

It is a front view which shows one Embodiment of the electrodeposition coating apparatus by this invention. It is a front view of the electrodeposition coating apparatus by the said embodiment. It is A arrow view of the electrodeposition coating apparatus by the said embodiment. It is principal part sectional drawing of the conveyance pipe by the said embodiment. It is a front view which shows one Embodiment of the electrodeposition coating system containing the electrodeposition coating apparatus by the said embodiment. It is a top view of the electrodeposition coating system by the said embodiment. It is the figure which looked at the electrodeposition coating system by the said embodiment from the pre-processing apparatus side.

Explanation of symbols

1 tank (container)
2 Conveying pipe (conveying means)
2a Ribbon screw (ribbon type blade feed means)
3 Rotating device (Rotating means)
4a First electrode (applying means)
10 Electrodeposition paint 21 Inner pipe 21a Supply port (end of one end of the inner pipe)
22 outer pipe 22a pipe end (end of the other end of the outer pipe)
22b Discharge port (tube end on one end of outer tube)

Claims (14)

An electrodeposition coating apparatus comprising: a tank in which an electrodeposition paint is accommodated; a dipping device that immerses an object to be coated in the tank; and an application unit that applies a voltage to the electrodeposition paint and the object to be coated. ,
The dipping device is inclined downward from one end side toward the other end side, the other end side reaches the tank, and the one end side is supplied or discharged with a transport pipe, and the inside of the transport pipe A ribbon screw provided on the rotating device, and a rotating device for rotating the conveying pipe,
The transport pipe has an inner pipe where the article to be freely dropped to the other end side, and an outer pipe positioned on a concentric circle of the inner pipe,
The ribbon screw is an electrodeposition coating apparatus that is provided between the inner tube and the outer tube and conveys the object to be coated to one end side by driving the rotating device.   The application means includes a first electrode that contacts the transport pipe and is connected to one pole of a DC power supply, and a second electrode that is immersed in the tank and connected to the other pole of the DC power supply. The electrodeposition coating apparatus according to claim 1.   The electrodeposition according to claim 1 or 2, wherein a plurality of ridges are provided regularly on the contact surface of the coated object on the inner peripheral surface of the outer tube so that the coated object is in point contact or line contact. Painting equipment.   The pipe end on the other end side of the transport pipe is closed with a porous plate or a mesh plate through which the object to be coated does not pass but the electrodeposition paint can flow. Electrodeposition coating equipment.   5. The electrodeposition coating apparatus according to claim 1, wherein the inner pipe and the outer pipe are provided with a plurality of holes through which the object to be coated does not pass but through which the electrodeposition paint can circulate.   A tube end on one end side of the inner tube is extended to have an extending portion protruding from a tube end on the one end side of the outer tube, and the extending portion forms a runway for allowing the article to be freely dropped to fall. The electrodeposition coating apparatus according to any one of claims 1 to 5.   The support base which insulates and supports the said extension part so that rotation is possible, The said 1st electrode is a brush electrode which is insulatively supported by the said support base, and is in sliding contact with the outer periphery of the said extension part. Electrodeposition coating equipment.   The electrodeposition coating apparatus of Claim 7 provided with the vibration motor provided in the said support stand and transmitting a vibration to the said conveyance pipe | tube. An electrodeposition coating method for storing an electrodeposition paint in a storage means, immersing a coating object in the storage means by a dipping means, and applying a voltage to the electrodeposition paint and the coating object by an application means,
The dipping means is inclined downward from one end side toward the other end side, the other end side reaches the accommodating means, and the conveying means for supplying or discharging the article to be coated to the one end side; Ribbon type blade feeding means provided inside, and rotating means for rotating the conveying means,
The transport means includes an inner tube where the article to be dropped freely on the other end side, and an outer tube positioned on a concentric circle of the inner tube,
The ribbon type blade feeding means is an electrodeposition coating method which is provided between the inner tube and the outer tube and conveys the object to be coated to one end side by driving the rotating means.   The application means includes a first electrode and a second electrode, the first electrode is in contact with the transport means and connected to one of the poles of a DC power source, and the second electrode is immersed in the housing means to be DC The electrodeposition coating method of Claim 9 connected to the other pole of a power supply.   The electrodeposition according to claim 9 or 10, wherein a plurality of ridges are provided regularly on the contact surface of the object to be coated on the inner peripheral surface of the outer tube so that the object to be point-contacted or line-contacted. How to paint. The electrodeposition coating apparatus according to any one of claims 1 to 7,
A first water-washing device arranged on the way of transportation of a first belt conveyor for transporting the coated object discharged from the electrodeposition coating device;
An electrodeposition coating system comprising: a heating and drying device arranged on the way of transportation of a second belt conveyor that transports the water-washed article to be delivered from the first belt conveyor.   The electrodeposition coating system of Claim 12 further provided with the pre-processing apparatus which pre-processes the said to-be-coated article before coating. The pretreatment device includes:
A degreasing device for degreasing the object to be coated before painting;
A second water rinsing device for rinsing the article to be degreased with this degreasing device;
A surface adjustment device for adjusting the surface of the object to be washed which has been washed with the second water washing device;
A chemical conversion treatment device for chemical conversion treatment of the article whose surface is adjusted by the surface adjustment device;
A third water rinsing device for rinsing the article subjected to the chemical conversion treatment with this chemical conversion treatment device;
The object to be coated before coating is transported to the electrodeposition coating apparatus, and the degreasing apparatus, the second water washing apparatus, the surface conditioning apparatus, the chemical conversion treatment apparatus, and the third water washing apparatus are transported to the object to be coated. The electrodeposition coating system according to claim 13, further comprising a third belt conveyor arranged in series in the direction.

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