JP4807621B2 - Coating processing apparatus and coating processing method - Google Patents

Description

  The present invention relates to a coating processing apparatus and a coating processing method for immersing and lifting a workpiece in a coating processing tank.

  2. Description of the Related Art Conventionally, a coating processing apparatus that transports a workpiece that is an object to be coated using a transporting means such as a trolley conveyor and performs a coating process has been used.

  In such a coating processing apparatus, a continuous coating processing method in which a workpiece is continuously dipped and pulled up in a coating processing tank is often used. In such a continuous coating processing apparatus, the track shape of the trolley conveyor that suspends and conveys the workpiece is inclined downward from the conveying height to a position where the workpiece is immersed in the coating treatment tank, and then the workpiece is coated in the coating treatment tank. A horizontal trajectory with a height that passes through the inside, and then the workpiece is lifted up from the coating treatment tank and tilted up to the conveyance height so as to reach the conveyance height, and the workpiece is conveyed and the painting treatment tank. There has been proposed a continuous coating apparatus that is dipped in, coated, pulled up and sent to the next process (for example, see Patent Document 1).

  In addition, an automatic hoist that moves the workpiece up and down is moved along the transport rail at a certain height, and the movement of the automatic hoist when the workpiece comes over the coating treatment tank is stopped. Tact coating (batch coating) where the workpiece is lowered and immersed in the coating treatment tank, and then the workpiece is raised by the automatic hoist and pulled up from the coating treatment tank, and then the automatic hoist is moved along the transfer rail and sent to the next process. ) Method has also been proposed (see, for example, Patent Document 1). Furthermore, a flexible rail that can move freely in the vertical direction is attached to a part of the conveyor that suspends and conveys the workpiece, and the workpiece suspended by the vertical movement of this flexible rail is moved up and down to be taken in and out of the painting booth. A method of performing this has been proposed (see, for example, Patent Document 2).

  On the other hand, in order to paint evenly on the surface of a small work, it is necessary to hold the small work with an appropriate interval between them, and as a spray coating device corresponding to this, it was installed in the horizontal direction. A method has been proposed in which a plurality of small workpieces are mounted on a mounting jig that rotates about a rotation axis, the workpiece is rotated, and paint is sprayed on the workpiece to paint the front and back surfaces uniformly (for example, Patent Document 3). reference).

Japanese Patent Laid-Open No. 9-279395 JP-A-2005-334783 JP 2001-121048 A

  Even when a small work is to be painted by a conventional continuous or tact coating method as disclosed in Patent Document 1 or 2, the work is held at an appropriate interval as in Patent Document 3. It will be necessary. Therefore, when such a small workpiece is to be painted by the conventional technique disclosed in Patent Document 1 or 2, the hanger 111 is attached to the trolley conveyor 107 or the rail 113 as shown in FIGS. Is hung directly or through an automatic hoist 115, and the work 109, which is an object to be coated, is held on the hanger 111 and immersed in the paint in the paint tank 103 from the conveying height. However, if the small work 109 is directly held on the hanger 111 by the holding method as shown in Patent Document 3, the holding shape of the hanger 111 becomes complicated, and as shown in FIG. In addition, a method is used in which the hanger 111 protrudes the branch portion 112, a hook hole 117 is provided in one work 109, and the work 109 is suspended in the hook hole 117 through the branch portion 112. In addition, when the workpiece 109 becomes smaller, it may be difficult to provide the hook hole 117 or the hole may not be drilled depending on the workpiece. In such a case, in both cases of continuous coating and tact coating, the work 109 is placed in a bucket 119 having a bottom surface constituted by a metal mesh 121 as shown in FIG. A method of hanging from the hoist 115 was used.

  However, the method of suspending such a small workpiece 109 from the branch portion 112 of the hanger 111 can be used only for a workpiece capable of processing the hook hole 117, or the workpiece 109 can be removed from the branch portion 112, Since it takes time to take out the work 109 from the bucket 119, and there is a case where the paint surface of the work 109 is damaged at the time of removal and removal, there is a problem in painting efficiency and painting quality.

  Therefore, the present invention continuously conveys a small work, which is an object to be coated, without using a hanging member such as a hanger or bucket, soaks in a coating treatment tank, pulls up and conveys to the next process, The purpose is to improve the efficiency of painting and improve the quality of painting. In addition, the present invention continuously processes the coating process even for smaller workpieces that cannot be hung by hanging on a hanger or the like and workpieces that cannot be drilled, thereby improving the efficiency of coating and improving the coating quality. With the goal.

  A coating processing apparatus according to the present invention circulates together with an endless circulating member that circulates over a coating processing tank, a plurality of guides that define a circulation path shape of the endless circulating member, and the endless circulating member, A circulation unit comprising a conveyance unit, and a first guide located above the coating treatment tank is moved downward to change the shape of the circulation channel of the endless circulation member, and a part of the conveyance unit A dropping mechanism for dropping the workpiece into the coating treatment tank together with the workpiece, and a circulation path shape of the endless circulation member by moving the second guide by the movement length of the endless circulation member due to the downward movement of the first guide. And a circulation conveyance path length adjusting mechanism for adjusting the length of the circulatory path.

  Further, in the coating processing apparatus according to the present invention, the circulation conveyance path is arranged in parallel to the conveyance direction, and a net for conveying the workpiece is disposed between endless chains whose circulation path shape is defined by a plurality of pairs of sprockets. An attached endless chain conveyor, at least one pair of first sprockets that pushes down the endless chains on both sides of the endless chain conveyor above the coating treatment tank, and driving the first sprocket vertically At least one vertical drive mechanism, and the circulation conveyance path length adjusting mechanism is provided on both sides of the endless chain conveyor by the moving length of the endless chain conveyor by the downward movement of the first sprocket. At least one pair of second sprockets for moving the endless chain, and a small amount for moving the second sprocket back and forth. A configuration including at least one advance / retreat driving mechanism is preferable.

  The coating treatment method according to the present invention circulates over a coating treatment tank, is arranged in parallel with the conveying direction for conveying a workpiece, and is arranged between endless chains whose circulation path shape is defined by a plurality of pairs of sprockets. A coating processing method for performing a coating process on the workpiece by an endless chain conveyor to which a net for transporting the workpiece is attached, and after the workpiece is loaded onto the coating processing tank by the endless chain conveyor, the conveyance is stopped. After the workpiece carrying-in process and the workpiece carrying-in process, the first sprocket above the coating treatment tank is moved downward to push the endless chains on both sides of the endless chain conveyor above the painting treatment tank downward. And lowering the second sprocket by the moving length of the endless chain conveyor due to the downward movement of the first sprocket. The endless chain conveyor on both sides of the endless chain conveyor is moved, a dipping step in which a part of the endless chain conveyor is dipped into the coating treatment tank together with the work, and the second sprocket is moved after the dipping step. And raising the first sprocket by the movement length of the endless chain conveyor by the movement of the second sprocket, and pulling up a part of the endless chain conveyor together with the workpiece from the coating treatment tank; After the pulling step, it has a workpiece unloading step of unloading the workpiece pulled up from the coating treatment tank by the endless chain conveyor.

  The present invention continuously conveys a small work, which is an object to be coated, without using a hanging member such as a hanger or bucket, soaks it in a coating treatment tank, pulls it up, and conveys it to the next process. There is an effect that the efficiency can be improved and the coating quality can be improved. In addition, the present invention continuously processes the coating process even for smaller workpieces that cannot be hung by hanging on a hanger or the like and workpieces that cannot be drilled, thereby improving the efficiency of coating and improving the coating quality. There is an effect that can be done.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of a coating processing apparatus of the present invention, FIG. 2 is an enlarged view of an endless chain and a net portion of the coating processing apparatus, and FIGS. 3 to 6 show the operation of the coating processing apparatus. It is operation | movement explanatory drawing to explain.

  As shown in FIG. 1, the coating processing apparatus 11 according to the embodiment of the present invention includes an endless chain conveyor 15 having a net 19 for transporting a workpiece 21 between endless chains 17. The endless chain conveyor 15 is guided by a transport drive sprocket 23, guide sprockets 29a to 29e, and a length adjusting sprocket 27 so as to surround the upper and lower sides of the coating treatment tank 13. The guide sprockets 29a to 29e are rotatably attached to an apparatus frame (not shown), and the conveyance drive sprocket 23 is rotationally driven by a conveyance drive mechanism fixed to the apparatus frame (not shown). The endless chain conveyor 15 circulates and moves up and down the coating treatment tank 13 by the rotation of the transport drive sprocket 23. To support the endless chain 17 on the lower side of the endless chain 17 between the guide sprocket 29e and the length adjusting sprocket 27 and on the lower side of the endless chain 17 between the guide sprocket 29a and the transport drive sprocket 23. The support rail 65 is fixed to a device frame (not shown) and holds the endless chain 17 so as not to bend.

  A dropping sprocket 25 for dropping the endless chain 17 together with the net 19 into the painting treatment tank 13 is installed on the upper part of the painting treatment tank 13. Each drop sprocket 25 is connected to a vertical drive cylinder 31 by a drive rod, and each vertical drive cylinder 31 is attached to a cylinder support frame 32 fixed to a device frame (not shown). The dropping sprocket 25 is driven in the vertical direction according to the vertical movement of the vertical drive cylinder 31. The length adjusting sprocket 27 is attached to the folded portion of the endless chain conveyor 15 on the opposite side to the transport drive sprocket 23. Each length adjusting sprocket 27 is connected to a lateral drive cylinder 33 by a drive rod, and each lateral drive cylinder 33 is attached to a cylinder support frame 34 fixed to an apparatus frame (not shown). The length adjusting sprocket 27 is driven in the lateral direction in accordance with the advancing / retreating operation of the lateral drive cylinder 33. Further, a negative electrode drive cylinder 55 that drives the negative electrode 53 for electrodeposition coating up and down is attached to an apparatus frame (not shown).

  The coating treatment tank 13 stores the electrodeposition paint 35 inside, and an overflow tank 37 for keeping the liquid level of the electrodeposition paint in the coating treatment tank 13 constant is attached to one end. A net cleaning device 41 for cleaning the electrodeposition paint adhering to the endless chain conveyor 15 with spray water is provided opposite to the upper and lower sides of the endless chain conveyor 15 below the coating processing tank 13.

  As shown in FIG. 2, the endless chain 17 is rotatably mounted with an outer plate 57 and an inner plate 59 superimposed on both sides of the roller 61, and the outer plate 57 and the inner plate 59 are alternately connected between adjacent rollers 61. It has a structure that is. An angle-type attachment 63 is attached to the outer plate 57, and a metal net 19 is fixed by bolts 67 and nuts 69 with an insulating material 71 sandwiched between holes formed in the flange surface of the attachment 63. With this structure, the metal net 19 is electrically insulated from the metal endless chain 17 and is also electrically insulated from a device frame (not shown). The roller 61 runs on the support rail 65. Further, by electrically insulating the support rail 65 and each of the sprockets 23, 25, 27, 29a to 29e from a device frame (not shown), an insulating structure between the metal net 19 and the endless chain 17 is not used. 19 can also be electrically isolated from a device frame (not shown).

  The operation of this embodiment will be described with reference to FIGS. FIG. 3 shows a process of receiving the workpiece 21 and carrying it onto the coating treatment tank 13. FIG. 4 shows a descending immersion process in which the workpiece 21 is lowered and immersed in the coating treatment tank 13, and FIG. FIG. 6 shows an unloading process for unloading the pulled workpiece 21 to the next process.

  As shown in FIG. 3, the endless chain conveyor 15 is guided by a transport drive sprocket 23, guide sprockets 29 a to 29 e and a length adjusting sprocket 27 to form a circulation transport path that passes over the coating treatment tank 13. ing. Then, the conveyance drive sprocket 23 rotates in the clockwise direction as indicated by the arrow shown in FIG. 3, so that the entire endless chain conveyor 15 is driven in the clockwise direction as indicated by the arrow. The dropping sprocket 25 is located above the endless chain conveyor 15 above the coating treatment tank 13. Further, the minus side electrode 53 is located above the endless chain conveyor 15 and is in a position not in contact with the endless chain conveyor 15 and the workpiece 21. The electrodeposition paint 35 is stored in the paint processing tank 13, and this electrodeposition paint 35 is circulated between the paint processing tank 13 and the overflow tank 37 by the paint circulation pump 39, and the liquid of the electrodeposition paint 35 in the paint processing tank 13 is stored. The surface is kept at a certain height. Further, a positive electrode 51 connected to a DC power source 49 is suspended from the coating treatment tank 13.

  A workpiece 21 is supplied from a workpiece supply device (not shown) onto the net 19 on the upstream side in the conveyance direction of the coating treatment tank 13. At this time, the workpieces 21 are placed on the net 19 with an interval necessary for painting. The supplied workpiece 21 is sequentially conveyed onto the coating treatment tank 13 by the endless chain conveyor 15. When the workpiece 21 is conveyed to the area between the dropping sprocket 25 above the coating treatment tank 13, the conveyance drive sprocket 23 stops rotating and is braked so as not to rotate. This completes the carry-in process.

  As shown in FIG. 4, when each vertical drive cylinder 31 starts to move downward, each dropping sprocket 25 starts to push down the endless chain 17, and the dropping operation is started. Since the transport drive sprocket 23 is fixed by a brake so as not to rotate, the endless chain conveyor 15 is placed on the opposite side of the transport drive sprocket 23 by the length dropped by the endless chain 17 of the dropping sprocket 25 being pushed down. A certain length-adjusting sprocket 27 is drawn toward the transport drive sprocket 23. In accordance with this, the lateral drive cylinder 33 is extended so that the length of the entire endless chain conveyor 15 does not change, and the length corresponding to the distance at which the endless chain conveyor 15 is dropped is increased. The adjustment sprocket 27 is pushed out. At this time, the length of the endless chain conveyor 15 between the transport drive sprocket 23 and each drop sprocket 25 gradually increases as the drop amount increases. However, since the transport drive sprocket 23 is rotationally fixed, the drop sprocket 25 is relatively moved along the endless chain 17 by the length of the distance between the transport drive sprocket 23 and the drop sprocket 25. Will be moved to. For this reason, during the dropping operation, the dropping sprocket 25 rotates counterclockwise as indicated by the arrow in FIG. Further, the guide sprocket 29e and the length adjusting sprocket 27 also rotate clockwise as indicated by the arrows in FIG. 4 during the dropping operation. The relative position of the work 21 with respect to the coating treatment tank 13 approaches the transport drive sprocket 23 that is rotationally fixed by dropping the endless chain conveyor 15. Then, the drop-down sprocket 25 is lowered by the distance H to the dipping position by the vertical drive cylinder 31, the endless chain conveyor 15 is dipped in the electrodeposition paint 35 of the coating treatment tank 13 together with the workpiece 21, and the length adjusting sprocket 27 is When moving in the direction of the transport drive sprocket 23 by a distance L corresponding to the distance H, the dropping operation ends. The downward movement of the vertical drive cylinder 31 and the extension operation of the horizontal drive cylinder 33 are coordinated by a control device having a CPU by detecting the position of the endless chain conveyor 15 so that the total circulation length of the endless chain conveyor 15 does not change. It may be controlled, the hydraulic pressure may be adjusted by an adjustment mechanism so that it will extend the same distance as the downward movement, or the motor speed is set so that both operating speeds are the same and driven simultaneously May be started and stopped when a predetermined distance is moved by a limit switch or the like.

  When the workpiece is immersed in the coating material by the dropping operation as described above, the electrodeposition coating material 35 in the coating treatment tank 13 overflows into the overflow tank 37 by the immersion, but the water level is kept constant. At the same time as or after immersion, the negative electrode 53 is moved downward by the negative electrode drive cylinder 55 and brought into contact with the metal net 19. Then, the work 21 in contact with the metal net 19 is also energized, and an electrodeposition coating film is formed on the work surface. After a predetermined coating film formation time has elapsed, the energization of the plus side electrode 51 is stopped and the minus side electrode 53 is raised by the minus side electrode drive cylinder 55.

  When the above-described dipping step is completed, as shown in FIG. 5, the lateral drive cylinder 33 is contracted to move the length adjusting sprocket 27 in the opposite direction to the rotationally fixed transport drive sprocket 23, and this length The dropping sprocket 25 is moved upward by the vertical drive cylinder 31 so that the length of the entire endless chain conveyor 15 does not change according to the lateral movement amount of the endless chain conveyor 15 by the adjusting sprocket 27. In this case, the length of the endless chain conveyor 15 between the transport drive sprocket 23 and each drop sprocket 25 is gradually shortened as the endless chain conveyor 15 is pulled up, contrary to the previous dipping step. . Then, the dropping sprocket 25 is moved toward the transport drive sprocket 23 which is relatively fixed along the endless chain 17 by an amount corresponding to the reduced distance. For this reason, during the pulling-up operation, the dropping sprocket 25 rotates clockwise as indicated by the arrow in FIG. Further, the guide sprocket 29e and the length adjusting sprocket 27 also rotate counterclockwise as shown by the arrows in FIG. 5 during the pulling operation. Then, the relative position of the work 21 with respect to the coating treatment tank 13 approaches the length adjusting sprocket 27 side by lifting the endless chain conveyor 15. It is the same as the dropping operation that the horizontal driving cylinder 33 and the vertical driving cylinder 31 perform a cooperative operation so as not to change the entire length of the endless chain conveyor 15. When the length adjusting sprocket 27 is moved by a predetermined length L and the dropping sprocket 25 is raised by a distance H corresponding to this moving amount, the lifting process is completed, and the endless chain conveyor 15 returns to the shape before the dropping operation. Yes.

  When the pulling process is completed, the transport drive sprocket 23 starts rotating as shown in FIG. The conveyed workpiece 21 is sent from the endless chain conveyor 15 onto the lower post-process conveyor 45 on the conveyance drive sprocket 23 side. The post-process conveyor 45 conveys the received workpiece 21 and sends it to a post-processing process such as a water washing device 47. On the other hand, the endless chain conveyor 15 having the net 19 for transporting the work 21 between the endless chains 17 is immersed in the electrodeposition paint together with the work 21, and the electrodeposition paint is attached. It is necessary to drop the paint adhering to the net 19 before receiving it. Therefore, the transport drive sprocket 23 is rotated to move the endless chain conveyor 15 to the net cleaning device 41. Here, water pressurized by the net cleaning pump 43 is sprayed onto the net 19 to adhere the electrodeposition paint. So that the metal surface of the net 19 appears. When the portion of the endless chain conveyor 15 that has been further cleaned by rotating the transport drive sprocket 23 comes before the guide sprocket 29e, the workpiece 21 is again supplied onto the endless chain conveyor 15 from a workpiece supply device (not shown). The next painting cycle begins.

  As described above, in the present embodiment, the endless chain conveyor 15 can be dipped in and lifted up in the paint while a small work 21 that is an object to be coated is placed on the endless chain conveyor 15 while being transported. Therefore, the workpiece 21 can be coated at an appropriate interval without using a hanging member such as a hanger or a bucket, so that the coating efficiency can be improved and the coating quality can be improved. . Further, since the work 21 is immersed and pulled up in the coating treatment tank 13 by moving the endless chain conveyor 15 of the part on which the work 21 is placed in the vertical direction, the inclined portion of the trolley conveyor as in the conventional continuous coating method. There is no effect, and the entire apparatus can be made compact.

  In the present embodiment described above, the metal net 19 is attached over the entire circumference of the metal endless chain 17, but when performing electrodeposition coating using the coating processing apparatus 11 of the present embodiment. As shown in FIG. 7, it is also preferable to divide the metal net 19 for each part on which the workpiece 21 is placed and to electrically insulate them from each other. By doing in this way, the part energized at the time of electrodeposition coating can be limited to the part of the endless chain conveyor 15 immersed in the coating treatment tank 13, and the net etc. in the part of other net cleaning apparatuses 41 Can be de-energized. Thereby, there exists an effect that the electrical insulation of an apparatus is simplified. In order to further improve the insulation, it is also preferable to simplify the insulating structure of the attachment portion between the metal net 19 and the endless chain 17 by making the endless chain 17 not a metal but a resin. .

  FIG. 8 shows another embodiment of the coating processing apparatus of the present invention in the case of coating small objects such as bolts smaller than the above embodiment. The same reference numerals are used for the same parts as in FIGS. In another embodiment shown in FIG. 8, a dropping sprocket 25 for dropping the endless chain conveyor 15 on the upper part of the coating treatment tank 13 into the painting treatment tank 13 is provided in one place along the conveying direction. Support rails 65 fixed to the apparatus frame and guide sprockets 29a and 29f whose positions of the rotation center axis are fixed are attached to both sides of the apparatus. Since the work 21 is a small accessory, even if it is placed on the net 19 and immersed in the electrodeposition paint 35, it floats away from the net 19 and cannot be energized, so that sufficient painting cannot be performed. The workpieces may come into contact with each other and the contact surface may not be sufficiently painted. Therefore, in this embodiment, the drop sprocket 25 is provided in one place along the conveyance direction, and the small work 21 is stirred in the paint by rotating the conveyance drive sprocket 25 while being immersed in the paint. The work 21 is brought into contact with the metal net 19, and paint is applied to the entire surface of the work 21.

  The dropping and lifting operations of the other embodiment shown in FIG. 8 are the same as those of the above-described embodiment. In this embodiment, the transport drive sprocket 23 is rotated with the workpiece 21 immersed in the paint. Then, the entire endless chain conveyor 15 is circulated. As a result, the endless chain conveyor 15 where the work 21 immersed in the paint is also moved in the transport direction, but the inclination of the dropping sprocket 25 and the guide sprocket 29a is very steep. The workpiece 21 cannot be lifted together with the endless chain conveyor 15 and is agitated in the portion dropped into the paint. By this stirring operation, it is possible to apply the paint all over the entire surface of the accessory. When the immersion and stirring are completed, the rotation operation of the conveyance drive sprocket 23 is stopped, the workpiece 21 is pulled up, and then the workpiece is conveyed to a subsequent process.

  In addition to the effects similar to those of the embodiment shown in FIGS. 1 to 6, this embodiment can apply paint all over the surface of even a small work piece, and further improve the coating quality. There is an effect that you can.

  Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the embodiment shown in FIGS. FIG. 9 shows a case where the coating treatment apparatus 11 of the present invention is applied to a continuous multiple coating pretreatment apparatus. As shown in FIG. 9, in this embodiment, the endless chain conveyor 15 is guided by the transport drive sprocket 23, the guide sprockets 29a to 29i and the length adjusting sprocket 27, so that a water washing tank 77, a chemical washing tank 79, and a water washing tank 81 are provided. The water washing device 83 and the degreasing washing tank 73 are surrounded by the upper and lower sides, and pass through the water washing device 75. When the transport drive sprocket 23 is rotationally driven by a transport drive mechanism fixed to a device frame (not shown), the endless chain conveyor 15 is placed above, inside, and below each treatment tank or water washing device 73, 75, 77, 79, 81, 83. Cycle through and. Similarly, the guide sprockets 29a to 29i are rotatably attached to an apparatus frame (not shown) so that the position of the central axis does not move.

  The operation of this embodiment will be described. Similar to the embodiment shown in FIGS. 1 to 6, the workpiece 21 is transported on the endless chain conveyor 15 and is transported to each processing apparatus position. Then, after the conveyance drive sprocket 23 is stopped and fixed by applying a brake, the dropping operation is sequentially performed from the processing tank on the side close to the conveyance drive sprocket 23. This is because since the transport drive sprocket 23 is rotationally fixed, the endless chain conveyor 15 at the top of each processing tank moves to the transport drive sprocket 23 side by dropping operation into each processing tank. If the dropping operation to the processing tank on the side of the height adjusting sprocket 27 is performed, the workpiece 21 of the processing tank that has been dropped first is moved and moved by one side due to the dropping operation to the processing tank on the transport driving side. Because there is.

  Specifically, as shown in FIG. 9, after the transport drive sprocket 23 is stopped and rotated and fixed by a brake, it is dropped by the vertical drive cylinder 31a and the sprocket 25a is moved downward to wash the endless chain conveyor 15 together with the workpiece 21 with water. While dropping into the tank 77, the length adjusting sprocket 27 is moved by the dropping distance of the endless chain conveyor 15 by the lateral drive cylinder 33. When the dropping operation into the water washing tank 77 is completed, the dropping sprocket 25b is moved downward by the vertical drive cylinder 31b to drop the endless chain conveyor 15 into the chemical washing tank 79, and the length is adjusted again by the lateral driving cylinder 33. The sprocket 27 is moved by the distance the endless chain conveyor 15 is dropped into the chemical cleaning tank 79. In this way, the dropping operation into each tank and the lateral movement of the length adjusting sprocket 27 are sequentially performed. Then, when the operation of dropping the endless chain conveyor 15 into the degreasing and washing tank 73 and the lateral movement operation of the length adjusting sprocket 27 are completed, it is immersed for a predetermined time. When the immersion is completed, the workpiece 21 is lifted from each tank in the reverse order to the dropping operation. First, the lateral drive cylinder 33 is shortened to move the length adjusting sprocket 27 laterally, and the vertical drive cylinder 31d on the degreasing cleaning tank 73 is moved upward by a length corresponding to the lateral movement distance. The dropping sprocket 25d is raised. Then, when the lifting operation from the degreasing and cleaning tank 73 is finished, the workpieces are sequentially lifted from the respective tanks toward the transport drive sprocket 23, and when the lifting operation of the workpiece 21 from the washing tank 77 is completed, the lifting process is completed. When the pulling process is completed, the conveyance drive sprocket 23 is rotated to move the workpiece 21 onto the next processing tank, and the same dropping, dipping and pulling operations as described above are performed. In this way, a plurality of steps can be arranged and the coating process can be performed sequentially.

  In this embodiment, the workpiece 21 can be continuously dipped and pulled up in various coating treatment tanks with the workpiece 21 placed on the endless chain conveyor 15 that transports the small workpiece 21 at an appropriate interval. It can be continuously conveyed to the process, and there is an effect that the efficiency of the coating process can be improved. In addition, since the work 21 is immersed and pulled up by moving the endless chain conveyor 15 of the part on which the work 21 is placed in the vertical direction, the overall length of the work 21 can be increased even when multiple treatment tanks are installed. There is an effect that the entire apparatus can be made compact by suppressing this.

  In the description of the embodiments of the present invention, the coating processing apparatus used for electrodeposition coating has been described. However, the present invention is not limited to electrodeposition coating, and can be applied to other coating methods. Moreover, although it demonstrated using for the multiple pretreatment apparatus of a coating, it can also apply to a single coating pre-processing apparatus, and a multiple and a single coating post-processing apparatus.

It is a perspective view which shows the coating processing apparatus of embodiment of this invention. It is an enlarged view of an endless chain and a net part of a painting treatment apparatus of an embodiment of the present invention. It is a figure explaining operation | movement of the coating processing apparatus of embodiment of this invention, and is a figure which shows the process of accepting a workpiece | work and carrying it in on a coating processing tank. It is a figure explaining operation | movement of the coating processing apparatus of embodiment of this invention, and is a figure which shows the descent | dipping process of dipping a workpiece | work to a coating processing tank. It is a figure explaining operation | movement of the coating processing apparatus of embodiment of this invention, and is a figure which shows the raising process which pulls up a workpiece | work from a coating processing tank. It is a figure explaining operation | movement of the coating processing apparatus of embodiment of this invention, and is a figure which shows the carrying-out process which carries out the picked-up workpiece | work to the next process. It is a perspective view of the division | segmentation net | network attached to the coating processing apparatus of embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows the coating device by a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Coating processing apparatus, 13 Coating processing tank, 15 Endless chain conveyor, 17 Endless chain, 19 Net, 21 Workpiece, 23 Transport drive sprocket, 25, 25a-25d Drop sprocket, 27 Length adjustment sprocket, 29a-29i Guide sprocket, 31, 31a to 31d Vertical drive cylinder, 32 Cylinder support frame, 33 Lateral drive cylinder, 34 Cylinder support frame, 35 Electrodeposition paint, 37 Overflow tank, 39 Paint circulation pump, 41 Net cleaning device, 43 Net cleaning pump, 45 Post-process conveyor, 47 Flushing device, 49 DC power supply, 51 Positive side electrode, 53 Negative side electrode, 55 Negative side electrode drive cylinder, 57 Outer plate, 59 Inner plate, 61 Roller, 63 Attachment , 65 support rail, 67 bolt, 69 nut, 71 insulation material, 73 degreasing cleaning tank, 75 water washing apparatus, 77 water washing tank, 79 chemical washing tank, 81 water washing tank, 83 water washing apparatus, 103 paint tank, 107 trolley conveyor, 109 Workpiece, 111 Hanger, 112 Branch, 113 Rail, 115 Automatic hoist, 117 Hook hole, 119 Bucket, 121 Wire mesh, H, L Distance.

Claims (3)

An endless circulation member that circulates over the coating treatment tank, a plurality of guides that define a circulation path shape of the endless circulation member, and a conveyance unit that circulates together with the endless circulation member and conveys the workpiece. A circulating transport path;
A dropping mechanism for moving the first guide on the coating treatment tank downward to change the shape of the circulation path of the endless circulation member, and dropping a part of the transport unit into the painting treatment tank together with the workpiece;
A circulation conveyance path length adjustment mechanism for adjusting the length of the circulation path shape of the endless circulation member by moving the second guide by the movement length of the endless circulation member by the downward movement of the first guide; ,
The coating processing apparatus characterized by having. In the coating treatment apparatus according to claim 1,
The circulating conveyance path is
An endless chain conveyor that is arranged in parallel to the transport direction and has a net that transports the workpiece between endless chains whose circulation path shape is defined by a plurality of pairs of sprockets,
At least one pair of first sprockets that pushes down the endless chains on both sides of the endless chain conveyor above the coating treatment tank;
And at least one vertical drive mechanism for driving the first sprocket in the vertical direction,
The circulation conveyance path length adjustment mechanism is:
At least one pair of second sprockets that move the endless chains on both sides of the endless chain conveyor by the moving length of the endless chain conveyor by the downward movement of the first sprocket;
And at least one advance / retreat drive mechanism for advancing / retreating the second sprocket,
The coating processing equipment characterized by. A net that transports the workpiece is attached between endless chains that circulate over the coating treatment tank and are arranged in parallel with the conveyance direction for conveying the workpiece, and the circulation path shape is defined by multiple pairs of sprockets. A coating processing method for coating the workpiece with an endless chain conveyor,
A workpiece loading step of stopping conveyance after loading the workpiece onto the coating treatment tank by the endless chain conveyor;
After the work loading step, the first sprocket above the coating treatment tank is moved down to push down the endless chains on both sides of the endless chain conveyor above the coating treatment tank, and the second sprocket Moves the endless chain on both sides of the endless chain conveyor by the moving length of the endless chain conveyor due to the downward movement of the first sprocket, and a part of the endless chain conveyor together with the workpiece is applied to the coating treatment tank. A dipping step for dipping into
After the dipping step, the second sprocket is moved, the first sprocket is raised by the moving length of the endless chain conveyor due to the movement of the second sprocket, and a part of the endless chain conveyor is moved to the A pulling process to pull up from the coating treatment tank together with the workpiece;
After the pulling step, a workpiece unloading step of unloading the workpiece pulled up from the coating treatment tank by the endless chain conveyor;
A coating treatment method characterized by comprising:

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