JP2008302315A - Apparatus for supplying coating material, and method of coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus 1 for supplying a coating material, which is capable of supplying two kinds of room temperature crosslink-hardening coating materials A, B to each of a plurality of coating guns 2a-2d at a time without jumboizing the apparatus. <P>SOLUTION: The over supplied coating materials A, B are stored in cylinder tanks 82, 84 respectively while coating with each of the coating materials A, B by providing the cylinder tanks A, B in the middle of coating material paths 72, 74 between each of mixers 64a, 64b provided at a mixing device 6 and each of the coating guns 2a-2d, and while the coating material A is discharged from selected coating guns by supplying the coating material A from the mixer 64a, the temporarily stored coating material B is supplied from the cylinder tank 84 to discharge from the rest of the coating guns. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for supplying a multi-component paint such as a room temperature cross-linking two-component curable paint obtained by mixing a main agent and a curing agent, and a coating method using a multi-component paint on an object such as an automobile body or a part. About.

  A room-temperature cross-linking curable coating (an example of a multi-component coating) is a one-component type that cures by volatilization of a solvent to form a coating film by causing a chemical reaction by mixing a main agent, a curing agent, and further an accelerator. Compared to a single-component paint, it is possible to form a coating film having excellent weather resistance, chemical resistance, and the like.

  Various proposals have heretofore been made for this type of paint mixing apparatus. For example, in Patent Document 1, a main agent supplied from a plurality of main agent tanks via a switching valve and a pump and a curing agent supplied from a plurality of curing agent tanks via a switching valve and a pump were mixed by a mixer. Later, a two-component mixing apparatus configured to be supplied to a coating gun is disclosed. In Patent Document 2, the first liquid supplied by the first liquid supply device, the flow rate measured by the flow meter through the switching valve, and then sent by the control of the on-off valve and the second liquid supply device are supplied. A two-component mixing apparatus is disclosed that is configured to mix a second liquid sent by control of an on-off valve after a flow rate measurement with a flow meter and then supply the mixture to a spray gun.

  By the way, when this type of paint is used to increase the number of colors and is assumed to be used, for example, in a top coat line of an automobile body, for example, a color change valve unit (CCV) having a plurality of switching valves on the upstream side of the mixer. ) Incorporating a color change valve unit called), and switching the type of liquid agent (main agent, curing agent, etc.) supplied to the mixer by this CCV, so that multiple colors of paint can be obtained with one mixer In addition, it is conceivable that a similar CCV is incorporated on the downstream side of the mixer to supply a plurality of colors of paint to one paint gun with one mixer. FIG. 15 shows an example in which such a paint supply device is arranged for each coating gun. In the figure, one mixer is arranged for one paint gun.

  However, in the coating material supply apparatus having the configuration shown in FIG. 15, one mixer is arranged for one coating gun, so that there is a problem that the apparatus becomes large and the production efficiency deteriorates.

  Therefore, in order to reduce the number of installed mixers, it is also conceivable that a single mixer is shared by a plurality of coating guns, and a plurality of colors of paint are supplied to each coating gun by a single mixer. An example of such a paint supply apparatus is shown in FIG. In the figure, one mixer is arranged for a plurality of paint guns.

  However, in the coating material supply apparatus having the configuration shown in FIG. 16, only one type of coating material can be supplied to each coating gun at a time. For this reason, for example, in a plurality of coating guns installed on the top coating line or the like of an automobile body that is continuously conveyed, the coating gun (gun 4 in the figure) disposed on the first stage and the coating disposed on the last stage. Despite the desire to paint with a different paint type at the same time with a gun (Gun 1 in the figure), start painting with the next paint B until the first paint A finishes painting with all paint guns I couldn't. In order to avoid this, there was a problem that the sharing of the mixers was abandoned and the number of mixers had to be increased.

  In addition, since only one type of paint is supplied to each paint gun at a time, there is a deviation in the paint timing between one paint gun and another paint gun in continuous conveyance by a conveyor. It was not possible to continuously coat the object to be painted.

Japanese Patent Laid-Open No. 11-244744 JP 2005-40680 A

  In view of the above points, the present invention provides a paint supply device capable of supplying a plurality of multi-component paints to a plurality of coating guns at a time without increasing the size of the device, and supplying a plurality of multi-component paints at a time. An object of the present invention is to provide a coating method capable of being discharged from a plurality of coating guns.

In order to achieve the above object, a paint supply apparatus according to the present invention comprises:
A mixer having a plurality of mixers for supplying multi-component paint to a plurality of coating guns via a plurality of supply paths;
In the middle of a supply path from at least one mixer to each paint gun, the multi-liquid paint is temporarily stored, and storage means capable of re-supplying the multi-liquid paint after storage to each paint gun is provided. .

In order to achieve the above object, the coating method according to the present invention comprises:
A coating method in which multi-component paint is supplied from a mixer and discharged from a plurality of coating guns.
A first main coating process in which a first multi-component paint is supplied from a mixer and discharged from a part of the coating gun;
While discharging the first multi-component paint from some of the coating guns, the first multi-component paint exceeding the discharge amount is continuously supplied from the mixer, and the first multi-component paint in excess of the supply is temporarily supplied. A first storage step for storing automatically,
A first liquid stopping step of stopping supply of a liquid necessary for obtaining the first multi-liquid paint to the mixer after storing a predetermined amount of the first multi-liquid paint;
A first sub-coating step of supplying a first multi-component paint temporarily stored and discharging from the remaining paint gun after stopping the supply of liquid to the mixer;
While the temporarily stored first multi-component paint is discharged from the remaining paint gun, the supply of the liquid necessary for obtaining the second multi-component paint to the mixer is started, and the second And a second main coating step of discharging the first multi-liquid paint from a part of the coating gun after the first multi-liquid paint has been discharged.

  According to the coating material supply apparatus of the present invention, a plurality of multi-liquid coating materials can be supplied to a plurality of coating guns at a time. Moreover, since one mixer can be shared by a plurality of painting guns, the apparatus does not increase in size.

  According to the coating method of the present invention, a plurality of multi-liquid paints can be supplied at a time and discharged from a plurality of coating guns.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Paint Supply Device As shown in FIG. 1, a paint supply device 1 according to this embodiment is a device for supplying a plurality of multi-component paints to a plurality of coating guns 2a to 2d at a time.

  “Multi-liquid” as used in the present embodiment refers to a liquid using two or more liquids. There is no restriction on the “multi-component paint” supplied to each of the coating guns 2a to 2d in such a form, and a room-temperature cross-linking curable paint is mainly used. A mixed color paint may be used.

  The room temperature cross-linking curable paint includes urethane paint, epoxy paint, silicon paint, acrylic urethane paint, etc., and is obtained by mixing a plurality of liquid agents such as a main agent, a curing agent and an accelerator, and has weather resistance, A coating film having excellent chemical resistance and the like can be formed. For example, in the case of a urethane paint, it is usually two liquids, and a main agent made of a polyester resin and a curing agent made of an isocyanate resin are used. In this case, an organic solvent added in advance to at least one of the main agent and the curing agent and adjusted to have a coating viscosity at the time of mixing is used. However, it is also possible to use an undiluted solution of the main agent and curing agent, and use an organic solvent in the third tank so that the three liquids have a coating viscosity at the time of mixing, and further apply to mixed paints of three or more liquids. be able to.

  As the solvent volatilization drying type paint, for example, nitrified cotton lacquer can be divided into a paint and an organic solvent and used as two liquids.

  The multi-color paint is, for example, a mixture of a plurality of single-color paints such as red, orange, yellow, green, blue, indigo and purple. For example, the red and blue paints can be used separately as two liquids. it can. In this case, by changing these mixing ratios, an intermediate color can be expressed, or a gradation pattern in which the color changes every moment can be expressed.

  Hereinafter, as the “multi-component paint”, a room temperature cross-linked two-component curable paint (hereinafter simply referred to as “paint”) obtained by mixing the main agent and the curing agent will be described as an example.

  As each of the coating guns 2a to 2d, a rotary atomizing electrostatic coating gun, an air electrostatic coating gun, or the like is used, and the supplied paint is sprayed toward an object to be coated.

  Each of the coating guns 2a to 2d is supplied with paint derived from the mixer 6, but for the coating guns 2a to 2c, a main color change valve unit (hereinafter referred to as "main CCV"). 42, 44, 46 and the paint pumps 52, 54, 56.

  The mixer 6 is supplied with a plurality of main agents supplied from a plurality of main agent tanks (not shown) via a sub color change valve unit (hereinafter referred to as “sub CCV”) 47 and a main agent pump 57, and a plurality of curing agents. A curing agent supplied via a sub-CCV 48 and a curing agent pump 58 is supplied from an agent tank (not shown) and mixed to form a paint.

  Each CCV 42, 44, 46 to 48 supplies a plurality of paint type switching valves 42b, 44b, 46b,... Or liquid type switching valves 47b, 48b, etc. to the manifolds 42a, 44a, 46a to 48a, and a cleaning liquid such as thinner. The cleaning liquid switching valves 42c, 44c, 46c to 48c to be connected to the air switching valves 42d, 44d, 46d to 48d for supplying air are connected.

  In the manifolds 42a, 44a, 46a to 48a, paint passages or liquid agent passages (both not shown) are formed, and the switching valves are provided so as to face these passages. A needle valve (not shown) is provided at the downstream outlet of each passage. The needle valve controls the lead-out / stop of the paint or liquid agent (main agent and curing agent) fed into the paint passage or liquid agent passage to the downstream side.

  Various paints such as paint A and paint B are supplied from the mixer 6 to the paint type switching valves 42b, 44b, and 46b through the paint passages 72 and 74, for example.

  Each liquid agent type switching valve 47b, 48b is supplied with various main agents such as main agent A and main agent B from a plurality of main agent tanks via a liquid agent pipe (not shown). Similarly, liquid agents are supplied from a plurality of curing agent tanks. Various curing agents such as curing agent A and curing agent B are supplied through piping (not shown). As the main agent, for example, acrylic, polyester, urethane, polyester urethane, acrylic urethane, or the like is used. For example, isocyanate is used as the curing agent.

  The cleaning liquid is supplied to the cleaning liquid switching valves 42c, 44c, 46c to 48c, and the compressed air is supplied to the air switching valves 42d, 44d, 46d to 48d. The cleaning liquid and the compressed air clean the paint passage or liquid passage inside the manifolds 42a, 44a, 46a to 48a and the passage downstream of the manifolds 42a, 44a, 46a to 48a when changing the paint type or liquid type. Used for

  Each switching valve 42b to 42d, 44b to 44d, 46b to 46d has a built-in electromagnetic valve, and opens and sends one of the switching valves 42b, 44b and 46b. One of the plurality of paints can be selectively supplied to the paint passages in the manifolds 42a, 44a, 46a.

  Each of the switching valves 47b to 47d and 48b to 48d also has a built-in solenoid valve similar to the above, and opens one switching valve among the plurality of liquid agent type switching valves 47b, and includes a plurality of main agent tanks. The main agent from one tank can be selectively supplied to the liquid agent passage inside the manifold 47a. Similarly, the solenoid valve of one of the plurality of liquid type switching valves 48b is opened, and the hardener from one of the plurality of hardener tanks is selectively supplied to the liquid passage inside the manifold 48a. It is possible.

  The solenoid valve incorporated in each switching valve functions as a dump valve that discharges waste liquid to the outside in addition to the paint or liquid supply function to each manifold 42a, 44a, 46a to 48a. Can be discharged to the outside.

  In the present embodiment, the paint pumps 52, 54, and 56 and the liquid agent pumps 57 and 58 are all constituted by gear pumps. The gear pump is driven via a motor (not shown), and feeds a constant flow rate of paint (or liquid agent) controlled according to the number of rotations of the gear to each of the coating guns 2a to 2c (or the mixer 6). In particular, the liquid agent pumps 57 and 58 use a transmission to adjust the rotation ratio of the two pumps 57 and 58 in accordance with the required mixing ratio of the main agent and the curing agent currently used. The ratio of the main agent and the discharge amount of the curing agent can be made to match the above blending ratio. Each pump 57, 58 may use a flow meter instead of the gear pump.

  On the downstream side of both pumps 57 and 58, a mixer 6 is provided via a pair of on-off valves 49a and 49b that adjust the amounts of the liquids discharged from both pumps 57 and 58, respectively.

  The mixer 6 used in this embodiment is configured by connecting two mixers 64 a and 64 b on the downstream side of the manifold 62. The manifold 62 includes a main agent inflow port 62a for connecting a main agent passage 76 on the downstream side of the liquid agent pump 57, a curing agent inflow port 62b for connecting a curing agent passage 78 on the downstream side of the liquid agent pump 58, and both inflow ports 62a, Two discharge ports 62c and 62d for discharging the main agent and the curing agent supplied from 62b are provided, and these ports 62a to 62d are provided so as to face a liquid agent passage (not shown) formed in the manifold 62. It is. A switching valve (not shown) is provided in the middle of the liquid agent passage, and the first discharge port 62c selectively selects the flow path of the main agent flowing in from the main agent inflow port 62a and the hardening agent flowing in from the hardener inflow port 62b. It is possible to switch to the second discharge port 62d side and send it to either the first mixer 64a or the second mixer 64b.

  Each of the mixers 64a and 64b is configured as a static mixer in the present embodiment, and is provided with two types of spiral plates having a twist direction opposite to each other in a cylindrical flow path through which the liquid agent flows. By alternately arranging the elements, by repeating the action of dividing the flow of the liquid agent when passing through each element and the action of reversing the twist direction of the flow of the liquid agent when moving between adjacent elements, The main agent and the curing agent are kneaded. The mixers 64 a and 64 b are disposed at the upstream ends of the paint passages 72 and 74.

  In particular, in this embodiment, cylinder tanks 82 and 84 are provided on the downstream side of the mixers 64a and 64b, respectively.

  As shown in FIGS. 1-3, each cylinder tank 82 and 84 is an example of the storage means of this invention, the coating material supplied from each mixer 64a, 64b is stored temporarily, and the coating material after storage Are re-supplied to the coating guns 2a to 2d, and have tank bodies 822 and 842.

  In the bottom walls of the tank bodies 822 and 842 (the right wall or the left wall in FIGS. 2 and 3), the paint inflow portions 824 and 844 that allow the inflow of the paint from the mixers 64a and 64b, and the paint A plurality of paint discharge portions 826,..., 847,... Discharge the paint flowing in from the inflow portions 824, 844 toward the coating guns 2a to 2d. The paint inflow portions 824 and 844 are connected to the paint passages 72 and 74 on the downstream side of the mixers 64a and 64b, and the plurality of paint discharge portions 826,. It is connected to a plurality of paint passages 72, 74,. In the present embodiment, the paint inflow portions 824 and 844 have a check valve structure, so that the paint once flowing in from the paint inflow portions 824 and 844 can be prevented from flowing back to the mixers 64a and 64b. It has become.

  In the tank main bodies 822 and 842, there are free pistons 827 and 847 which are slidable inside, and rods 828 which are movable in the axial direction with one end 828a and 848a connected to the back side of the free pistons 827 and 847, 848 is arranged. The other end of the rods 828 and 848 is connected to a drive source (not shown) that can move the rods 828 and 848 in the axial direction.

  And from each paint discharge part 826, ..., 845, ... to each painting gun 2a-2d (strictly speaking, any one of the paint type switching valves 42b, 44b, 46b, ... of each main CCV 42, 44, 46) When the amount of paint that exceeds the internal volume of the paint passages 72 and 74 is discharged from the mixers 64a and 64b into the paint passages 72 and 74 (up to the coating gun 2d), There is no temporary destination, and the surfaces of the free pistons 827 and 847 are pushed back to the drive source side (the left side in FIG. 2 and the right side in FIG. 3) in the tank bodies 822 and 842 of the cylinder tanks 82 and 84. , 847 and the inner walls of the tank bodies 822 and 842, spaces (paint storage chambers) 823 and 843 are created and stored therein. Thereafter, if necessary, the drive source is operated, and the rods 828 and 848 are moved in the direction in which the rods 828 and 848 are pulled out from the drive source side (the right direction in FIG. 2 and the left direction in FIG. 3). The paint temporarily stored in the chambers 823 and 843 can be discharged toward the coating guns 2a to 2d through the plurality of paint discharge portions 826,.

  In addition, the switching control of the switching valve inside the needle valve of each CCV42, 44, 46-48, each switching valve 42b-42d, 44b-44d, 46b-46d, 47b-47d, 48b-48d, the manifold 62 of the mixer 6 is carried out. Is executed by a control signal sent from a paint control device (not shown) together with the pumps 52, 54, 56 to 58 and the paint guns 2a to 2d.

  According to the paint supply apparatus 1 of the present embodiment, the temporary storage means is provided in the middle of the paint passages 72 and 74 from the two mixers 64a and 64a provided in one mixer 6 to the plurality of paint guns 2a to 2d. Since the cylinder tanks 82 and 84 are provided, the coating material A is supplied from the first mixer 64a and discharged from some coating guns (for example, the coating guns 2c and 2d), and at the same time, the coating material B is supplied to the second mixer 64b. It can supply from the cylinder tank 84 arrange | positioned downstream, and can make it discharge from the remaining coating guns (for example, coating guns 2a and 2b). At the same time, the coating material B is supplied from the second mixer 64b and discharged from a part of the coating gun, and at the same time, the coating material A is supplied from the cylinder tank 82 arranged on the downstream side of the first mixer 64a and remains. It can be discharged from a painting gun. In any case, two paints A and B can be supplied to the plurality of coating guns 2a to 2d at a time. Moreover, since one mixer 6 can be shared by the plurality of coating guns 2a to 2d, the apparatus 1 is not increased in size.

  Further, since the cylinder tanks 82 and 84 as temporary storage means are provided in the middle of the paint passages 72 and 74 from the mixers 64a and 64a to the plurality of paint guns 2a to 2d, Compared with the conventional mixing apparatus in which the color change cannot be performed unless the path from the CCV 42, 44, 46 to the downstream side is cleaned and the path from the mixer to the gun tip is not cleaned, the remaining paint The amount of waste can be reduced.

  In the present embodiment, it is not always necessary to provide the cylinder tanks 82 and 84 on the downstream side of the mixers 64a and 64b, and at least one of the cylinder tanks 82 and 84 on the downstream side of the mixers 64a and 64b. It is sufficient if there is. For example, even when the cylinder tank 84 is provided only on the downstream side of the second mixer 64b and the cylinder tank 82 is not provided on the downstream side of the first mixer 64a, the paint A is supplied from the first mixer 64a to partially paint. At the same time as discharging from the gun, the paint B can be supplied from the cylinder tank 84 disposed on the downstream side of the second mixer 64b and discharged from the remaining coating guns. That is, two paints A and B can be supplied to a plurality of paint guns at a time.

Coating method Next, an example of a coating method using a coating material supply device 1 according to this embodiment.

  In the present embodiment, the process of discharging the paint supplied from the mixer 6 from each of the coating guns 2a to 2d constitutes the “main coating process”, and the temporarily stored paint supplied from the cylinder tanks 82 and 84 is used for each of the paints. The process of discharging from the painting guns 2a to 2d constitutes the “sub-coating process”.

The coating method of the present embodiment includes a first main coating process in which the coating A is supplied from a mixer and discharged from a part of the coating gun;
A first storage step in which the paint A exceeding the discharge amount is continuously supplied from the mixer while the paint A is being discharged from some of the paint guns, and the excess supply of the paint A is temporarily stored;
A first liquid stopping step of stopping the supply of the main agent A and the curing agent A necessary for obtaining the coating material A to the mixer after storing a predetermined amount of the coating material A;
A first sub-coating step of supplying the temporarily stored paint A and discharging it from the remaining paint gun after stopping the supply of the main agent A and the curing agent A to the mixer;
While the temporarily stored paint A is discharged from the remaining paint gun, supply of the main agent B and the curing agent B necessary to obtain the paint B to the mixer is started, and the paint B is mixed with the mixer B. A second main coating step of discharging from a part of the coating gun which has been supplied and discharged from the coating A, and
A second storage step in which the paint B exceeding the discharge amount is continuously supplied from the mixer while the paint B is being discharged from some of the paint guns, and the excess supply of the paint B is temporarily stored;
A second liquid stopping step of stopping supply of the main agent B and the curing agent B necessary for obtaining the coating material B to the mixer after storing a predetermined amount of the coating material B;
A second sub-coating step of supplying the temporarily stored paint B and discharging it from the remaining paint gun after stopping the supply of the main agent B and the curing agent B to the mixer;
While the temporarily stored paint B is discharged from the remaining paint guns, the supply of the main agent A and the curing agent A necessary to obtain the paint A to the mixer is started again, and the paint A is mixed. A first main coating step of discharging from a part of the coating gun that has been discharged from the paint B after being discharged from the container, and then again performing a first storage step, a first liquid stop step, and a first sub-coating step. Execute.

  According to the coating method of the present embodiment, paint A exceeding the discharge amount is supplied from the mixer 6 while the paint A is supplied from the mixer 6 and discharged from a part of the coating gun (first main coating step). Continue to supply, temporarily store excess supply of paint A (first storage step), store a predetermined amount of paint A, and then stop supplying main agent A and curing agent A to mixer 6 ( (First liquid stopping step), and thereafter, the paint A temporarily stored is supplied and discharged from the remaining coating gun (first sub-coating step). Meanwhile, in the meantime, supply of the main agent B and the curing agent B to the mixer 6 is started, and the paint B is supplied from the mixer 6 and discharged from a part of the paint gun after the discharge of the paint A is finished ( Second main painting process).

  During this second main coating process, the paint B exceeding the discharge amount is continuously supplied from the mixer 6, the excessive supply of paint B is temporarily stored (second storage process), and a predetermined amount of paint B is supplied. After the storage, the supply of the main agent B and the curing agent B to the mixer 6 is stopped (second liquid stopping step), and then the temporarily stored paint B is supplied and discharged from the remaining coating gun ( Second sub painting process). Meanwhile, during this time, supply of the main agent A and the curing agent A to the mixer 6 is started, and the paint A is supplied again from the mixer 6 and discharged from a part of the paint guns that have finished discharging the paint B. (First main painting process).

  Thereafter, during the first main coating process, the paint A exceeding the discharge amount is continuously supplied from the mixer 6, and the excess supply of the paint A is temporarily stored (first storage process), and a predetermined amount of the paint is applied. After storing A, supply of the main agent A and the curing agent A to the mixer 6 is stopped (first liquid stopping step), and then the temporarily stored paint A is supplied and discharged from the remaining coating gun. (First sub painting process). Details will be described below.

  (1) First, paint A is supplied from the mixer 6 and discharged from some of the paint guns 2b to 2d in the order of the paint gun 2d → the paint gun 2c → the paint gun 2b (first main painting process). That is, the object to be coated is painted with the paint A.

  As shown in FIG. 4, the preparation of the paint A is started, and the paint A is filled up to the main CCVs 42, 44, 46 and before the paint gun 2 d (hand gun).

  When the article to be coated is put into the preparation zone, the sub CCV 47 opens the solenoid valve of one of the plurality of liquid agent type switching valves 47b,. The main agent A is selectively guided into the manifold 47 a and the needle A of the manifold 47 a is opened to supply the selected main agent A to the liquid agent pump 57. Similarly, in the sub CCV 48, the solenoid valve of one of the plurality of liquid agent type switching valves 48b,... Is opened, and the curing agent A from one of the plurality of curing agent tanks is selectively manifolded. The selected hardener A is supplied to the liquid agent pump 58 by opening the needle valve of the manifold 48a while leading to the liquid agent 48a.

  In both liquid agent pumps 57 and 58, for example, using a transmission, the rotation ratio is adjusted in accordance with the required mixing ratio of the main agent A and the curing agent A currently used, and the discharge amount of the main agent A and the curing agent A is adjusted. The ratio is matched to the above blend ratio. As a result, the main agent A and the hardener A led out into the main agent passage 76 and the hardener passage 78 on the downstream side of the both liquid agent pumps 57 and 58 are opened and closed by the suction force of the both liquid agent pumps 57 and 58, respectively. It is led to the mixer 6 at a predetermined flow rate while being controlled by.

  The main agent A and the hardener A introduced into the manifold 62 of the mixer 6 via the main agent inflow port 62a and the hardener inflow port 62b are discharged through a switching valve provided in the middle of the liquid agent passage inside the manifold 62 as a first discharge. By switching so as to flow to the port 62c side, it is sent out to the first mixer 64a through the first discharge port 62c, and is mixed there to obtain a room temperature cross-linked two-component curable coating material A.

  The paint A obtained by the mixer 6 is sent out to the paint passage 72, and then guided to the cylinder tank 82 through the paint inflow portion 824 (see FIG. 2). Further, a plurality of paint discharge portions 826,. 2) and through the paint passage 72 to the main CCVs 42, 44, 46 and before the paint gun 2d.

  As shown in FIG. 5, when the object to be coated arrives at a predetermined position with respect to the coating guns 2a to 2d, the coating gun 2d is connected to the coating passage 72 to fill the gun tip with the coating A. At the same time, the solenoid valve of one of the plurality of paint type switching valves 46b,... In the main CCV 46 is opened, the paint A is selectively guided into the manifold 46a, and the needle valve of the manifold 46a is opened for selection. The applied paint A is supplied to the paint pump 56. In the paint pump 56, the number of revolutions is controlled so that a predetermined coating amount is obtained, whereby the paint A led out into the downstream paint hose 73c is applied at a predetermined flow rate by the suction force of the paint pump 56. 2c, and the gun tip is filled with paint A.

  As shown in FIG. 6, coating is started by quantitatively discharging the coating material A into a predetermined range of the object to be coated by the coating gun 2d. In the painting guns 2b and 2c, the paint pumps 54 and 56 are sequentially operated, and the built-in ON / OFF valves are switched, so that each main CCV 44 is in the order of the mixer 6 → the paint passage 72 → the cylinder tank 82 → the paint passage 72. , 46 is quantitatively discharged to a predetermined range of the object to be coated.

  (2) Next, while the coating material A is being discharged from some of the coating guns 2b to 2d, the coating material A exceeding the discharge amount is continuously supplied from the mixer 6, and the excessive amount of the coating material A is temporarily supplied. Store (first storage step).

  As preparation before the first main painting step, the paint A is sent in the order of the mixer 6 → the paint passage 72 → the cylinder tank 82 → the paint passage 72 to the main CCVs 42, 44, 46 and before the paint gun 2d. However, since this stage is in the middle of filling, as shown in FIG. 2, the paint A introduced into the cylinder tank 82 through the paint inflow portion 824 brings the surface of the free piston 827 to the drive source side (left side in FIG. 2). The pressure does not have enough pressure to push back, and the paint guns 2a to 2d escape through the plurality of paint discharge parts 826,. Accordingly, the paint A at this stage is not stored in the cylinder tank 82.

  Returning to FIG. 6, when painting with the paint A is started, a predetermined amount of the paint A is continuously removed from the gun tips of the guns 2 b to 2 d. For this reason, in order to make up for this, the supply of the paint A to the tip of each of the guns 2b to 2d is continued. Immediately after the start of painting, the continuously supplied paint A is temporarily all filled up to the tip of each gun 2b to 2d, but when the filling of the tip of the gun is completed, the coating A required for discharge is discharged. The flow rate decreases.

  In the present embodiment, even after the flow rate of the coating material A necessary for discharge is reduced, the coating material A having a flow rate exceeding the necessary discharge flow rate (the coating material A exceeding the discharge amount) is continuously supplied. At this time, the flow rate of the coating material A that is continuously supplied may be varied in comparison with the supply flow rate of the coating material A that is being filled or immediately after the start of painting. However, when the supply flow rate of the coating material A is changed, a change in the discharge amount (actual usage amount) of the coating material A from the gun tip is detected, and the result of the main agent A and the curing agent A introduced into the mixer 6 is detected. Unless the feedback is made to control the supply flow rate, the mixing of the main agent A and the curing agent A in the mixer 6 cannot be performed. In addition, there is a time lag in the control of the supply flow rates of the main agent A and the curing agent A by such feedback control, and the response of the on-off valves 49a and 49b may not be in time, and an error may occur in the mixing ratio. Therefore, in the present embodiment, after the filling of the paint A into the gun tip is completed and the flow rate of the paint A necessary for discharge is reduced, the supply of the paint A is continued at a constant flow rate without changing. Is preferred. Even after filling of the gun A with the paint A is completed, the supply flow rate of the paint A is kept constant to detect a change in the discharge amount (actual use amount) of the paint A from the gun. Even without feeding back to the control of the supply flow rates of the main agent A and the curing agent A introduced into the mixer 6, the main agent A and the curing agent A in the mixer 6 can be accurately mixed.

  Even after the filling of the paint A into the tip of the gun is thus completed, the paint A is excessively supplied by continuing to supply the paint A at a constant flow rate. As shown, in the tank main body 822 of the cylinder tank 82, the surface of the free piston 827 is pushed back to the drive source side (left side in FIG. 2), and a space between the surface of the free piston 827 and the inner wall of the tank main body 822 ( A paint storage chamber 823 is created and stored in this space 823.

  The storage of the coating material A in the cylinder tank 82 is performed until the necessary discharge amount of the coating material A discharged by the remaining coating guns 2a to 2d including the coating gun 2a that has not yet discharged the coating material A is stored.

  (3) Next, as shown in FIG. 7, when the storage of the paint A in the cylinder tank 82 is completed, the operation of the both liquid pumps 57 and 58 is stopped, and the main agent A and the curing agent A are supplied to the mixer 6. Is stopped (first liquid stopping step). Then, upstream of the first mixer 64a of the mixer 6 is cleaned in preparation for the filling of the paint B of the next color.

  First, the solenoid valve of each liquid agent type switching valve 47b, 48b that introduced the main agent A and the curing agent A into each manifold 47a, 48a of each sub CCV 47, 48 is closed and the cleaning liquid switching valve 47c of both sub CCVs 47, 48 is closed. The solenoid valve 48c is opened and the cleaning liquid is allowed to flow to the first mixer 64a of the mixer 6 to clean the path from the downstream side of both sub CCVs 47 and 48 to the first mixer 64a, and then the electromagnetic of the air switching valves 47d and 48d. Open the valve and scavenge the path. The main agent A, curing agent A, paint A and air remaining from the downstream side of the sub CCVs 47 and 48 to the first mixer 64a are, for example, provided with a drain valve (not shown) in the paint passage 72 on the downstream side of the first mixer 64a. Provided and discharged from here.

  (4) In the present embodiment, the paint A temporarily stored in each of the coating guns 2a to 2c is supplied from the cylinder tank 82 during the above cleaning. Specifically, as shown in FIG. 2, a paint source chamber 823 of the tank body 822 is operated by operating a drive source (not shown) and moving the rod 828 in the direction of drawing out from the drive source side (right direction in FIG. 2). The paint A temporarily stored therein is supplied to the coating guns 2a to 2c through a plurality of paint discharging units 826,..., And the supplied paint A is applied from the coating guns 2a to 2c. A predetermined amount is discharged into a predetermined range of the object (first sub-coating step).

  (5) Next, during the first sub-coating process, the supply of the main agent B and the curing agent B to the mixer 6 is started, the paint B is supplied from the mixer 6 and the discharge of the paint A is completed. (2nd main painting process). That is, the paint B is applied while the paint A is continuously applied.

  Next, as shown in FIG. 8, the preparation of the paint B is started, and the paint B is filled up to the main CCVs 42, 44, 46 and before the paint gun 2d. In the sub CCV 47, the solenoid valve of one of the plurality of liquid agent type switching valves 47b,... Is opened, and the main agent B from one of the plurality of main agent tanks is selectively guided into the manifold 47a. Then, the selected main agent B is supplied to the liquid agent pump 57 by opening the needle valve of the manifold 47a. Similarly, in the sub CCV 48, the solenoid valve of one of the plurality of liquid agent type switching valves 48b,... Is opened, and the curing agent B from one of the plurality of curing agent tanks is selectively manifolded. The selected curing agent B is supplied to the liquid agent pump 58 by opening the needle valve of the manifold 48a while leading to the liquid agent 48a.

  In both liquid agent pumps 57 and 58, as in the case of FIG. 4, the rotation ratio is adjusted in accordance with the required mixing ratio of the main agent B and the curing agent B, and the ratio of the discharge amount of the main agent B and the curing agent B is mixed as described above. Match the ratio. As a result, the main agent B and the curing agent B led out into the main agent passage 76 and the curing agent passage 78 on the downstream side of the both solution pumps 57 and 58 are opened and closed by the suction force of the both solution pumps 57 and 58, respectively. It is led to the mixer 6 at a predetermined flow rate while being controlled by.

  The main agent B and the hardener B introduced into the manifold 62 of the mixer 6 via the main agent inflow port 62a and the hardener inflow port 62b are switched valves (not shown) provided in the middle of the liquid passage in the manifold 62 (not shown). (Not shown) is switched so as to flow toward the second discharge port 62d, and is sent to the second mixer 64b through the second discharge port 62d, where it is mixed to obtain a room temperature cross-linked two-component curable coating material B. .

  The paint B obtained by the mixer 6 is sent out to the paint passage 74 and then guided to the cylinder tank 84 through the paint inflow part 844 (see FIG. 3), and further, a plurality of paint discharge parts 846,. 3) and through the paint passage 74 to the main CCVs 42, 44, 46 and before the paint gun 2d. When the object to be coated arrives at a predetermined position with respect to the coating gun 2d, the coating gun 2d is connected to the paint passage 74, the paint B is filled in the tip of the gun, and the object to be coated with the paint B is applied. Start.

  In the painting gun 2c, the main CCV 46 to the tip of the gun are cleaned in preparation for the filling of the next color paint B.

  First, the solenoid valve of each paint type switching valve 46b that led the paint A into the manifold 46a of the main CCV 46 is closed, and the solenoid valve of the cleaning liquid switching valve 46c of the main CCV 46 is opened, and the cleaning liquid is allowed to flow to the coating gun 2c. After cleaning all the passages on the downstream side of the CCV 46, the solenoid valve of the air switching valve 46d is opened to scavenge all the passages. The paint A and air remaining from the main CCV 46 to the coating gun 2c are discharged from the gun tip.

  In the present embodiment, the coating guns 2a and 2b are temporarily stored in the coating guns 2a and 2b during the above cleaning and coating with the coating gun 2d as in the case of FIG. The coating material A is supplied from the cylinder tank 82, and the supplied coating material A is discharged from the coating guns 2a and 2b to a predetermined range of the object to be coated (first sub-coating step).

  As shown in FIG. 9, when the article arrives at a predetermined position with respect to the coating gun 2c, the solenoid valve of one of the plurality of paint type switching valves 46b,. Is selectively introduced into the manifold 46a, and the needle B of the manifold 46a is opened to supply the selected paint B to the paint pump 56. The rotation speed of the paint pump 56 is controlled so that a predetermined coating amount is obtained, whereby the paint B led out into the paint hose 73 c on the downstream side is applied at a predetermined flow rate by the suction force of the paint pump 56. 2c and the gun B is filled with paint B. In the paint gun 2c, the paint pump 56 is operated and the built-in ON / OFF valve is switched, so that the paint B sent to the main CCV 46 in the order of the mixer 6 → the paint passage 74 → the cylinder tank 84 → the paint passage 74. Are quantitatively discharged into a predetermined range of the object to be coated (second main coating step).

  In the coating gun 2d arranged on the upstream side of the coating gun 2c, the quantitative discharge of the paint B has already been started on the object to be coated.

  (6) Next, while the paint B is being discharged from some of the coating guns 2c and 2d, the paint B exceeding the discharge amount is continuously supplied from the mixer 6, and the excess supply of the paint B is temporarily provided. Store (second storage step).

  As preparation before the second main painting step, the paint B is sent in the order of the mixer 6 → the paint passage 74 → the cylinder tank 84 → the paint passage 74 to the main CCVs 42, 44, 46 and before the paint gun 2d. However, since this stage is in the middle of filling, as shown in FIG. 3, the paint B introduced into the cylinder tank 84 through the paint inflow portion 844 brings the surface of the free piston 847 to the drive source side (right side in FIG. 3). The pressure does not have enough pressure to push back, and the paint guns 2a to 2d are pulled out through the plurality of paint discharge portions 846,. Therefore, the paint B at this stage is not stored in the cylinder tank 84.

  Returning to FIG. 9, when coating with the paint B is started, a predetermined amount of the paint B is continuously removed from the gun tips of the guns 2 b to 2 d. For this reason, in order to compensate for this, the supply of the coating material B to the gun tips of the guns 2b to 2d is continued. Immediately after the start of painting, the paint B that is continuously supplied is temporarily all the way to filling the gun tips of the guns 2b to 2d. The flow rate decreases.

  In this embodiment, even after the flow rate of the paint B required for discharge decreases, the paint B having a flow rate exceeding the required discharge flow rate (the paint B exceeding the discharge amount) is continuously supplied. At this time, the flow rate of the paint B that is continuously supplied may be varied in comparison with the supply flow rate of the paint B that is being filled or immediately after the start of painting. However, when the supply flow rate of the paint B is changed, a change in the discharge amount (actual use amount) of the paint B from the gun tip is detected, and the result of the main agent B and the curing agent B introduced into the mixer 6 is detected. Unless the feedback is made to control the supply flow rate, the mixing of the main agent B and the curing agent B in the mixer 6 cannot be performed. In addition, there is a time lag in the control of the supply flow rates of the main agent B and the curing agent B by such feedback control, the response of the on-off valves 49a and 49b may not be in time, and an error may occur in the mixing ratio. Therefore, in this embodiment, even after the filling of the paint B into the gun tip is completed and the flow rate of the paint B required for discharge is reduced, the supply of the paint B can be continued at a constant flow rate without changing. preferable. Even after the filling of the paint B into the gun tip is completed, the supply flow rate of the paint B is kept constant, thereby detecting a change in the discharge amount (actual use amount) of the paint B from the gun. Even without feeding back to the control of the supply flow rates of the main agent B and the curing agent B introduced into the mixer 6, the main agent B and the curing agent B in the mixer 6 can be accurately mixed.

  Thus, even after the filling of the paint B into the gun tip is completed, the paint B continues to be supplied at a constant flow rate, so that the paint B is excessively supplied. As shown, in the tank main body 842 of the cylinder tank 84, the surface of the free piston 847 is pushed back to the drive source side (right side in FIG. 3), and a space between the surface of the free piston 847 and the inner wall of the tank main body 842 ( A paint storage chamber 843 is created and stored in this space 843.

  The storage of the paint B in the cylinder tank 84 is performed until the required discharge amount of the paint B discharged by the remaining paint guns 2a to 2d including the paint guns 2a and 2b that have not yet discharged the paint B is stored. .

  Returning to FIG. 9, since the coating with the coating A is completed in the coating gun 2 b, the main CCV 44 to the gun tip are cleaned in preparation for the filling of the next color coating B.

  First, the solenoid valve of each paint type switching valve 44b that has led the paint A into the manifold 44a of the main CCV 44 is closed, and the solenoid valve of the cleaning liquid switching valve 44c of the main CCV 44 is opened, and the cleaning liquid flows to the coating gun 2b. After cleaning all the passages on the downstream side of the CCV 44, the solenoid valve of the air switching valve 44d is opened to scavenge all the passages. The paint A and air remaining from the main CCV 44 to the coating gun 2b are discharged from the gun tip.

  In the present embodiment, the paint A temporarily stored in the coating gun 2a is applied to the coating gun 2a even during the above cleaning and the coating of the coating B by the coating guns 2c and 2d. The coating material A supplied from the cylinder tank 82 is discharged from the coating gun 2a to a predetermined range of the object to be coated (first sub-coating step).

  (7) Next, as shown in FIG. 10, when the storage of the paint B in the cylinder tank 84 is completed, the operation of the two liquid agent pumps 57 and 58 is stopped, and the main agent B and the curing agent B are supplied to the mixer 6. Is stopped (second liquid stopping step). Then, upstream of the second mixer 64b of the mixer 6 is cleaned in preparation for filling with the next color paint A (an example of another paint).

  First, the solenoid valve of each liquid agent type switching valve 47b, 48b that led the main agent B and the curing agent B into each manifold 47a, 48a of each sub CCV 47, 48 is closed, and the cleaning liquid switching valve 47c of both sub CCVs 47, 48 is closed. The electromagnetic valve 48c is opened, and the cleaning liquid is allowed to flow to the second mixer 64b of the mixer 6 to clean the path from the downstream side of both sub CCVs 47 and 48 to the second mixer 64b, and then the electromagnetic of the air switching valves 47d and 48d. Open the valve and scavenge the path. The main agent B, the curing agent B, the paint B, and the air remaining from the downstream side of the sub CCVs 47 and 48 to the second mixer 64b are, for example, provided with a drain valve (not shown) in the paint passage 74 on the downstream side of the second mixer 64b. Provided and discharged from here.

  Since the coating gun 2a has finished painting with the paint A, the main CCV 42 to the tip of the gun are cleaned in preparation for the filling of the next color paint B.

  First, the solenoid valve of each paint type switching valve 42b that led the coating material A into the manifold 42a of the main CCV 42 is closed, and the solenoid valve of the cleaning liquid switching valve 42c of the main CCV 42 is opened, and the cleaning liquid flows to the coating gun 2a. After all the passages on the downstream side of the CCV 42 are washed, the solenoid valve of the air switching valve 42d is opened to scavenge all the passages. The paint A and air remaining from the main CCV 42 to the coating gun 2a are discharged from the gun tip.

  Since painting with the paint B is completed in the paint gun 2d, the paint gun 2d is removed from the paint passage 74 and cleaned in preparation for the filling of the paint A of the next color.

  (8) In the present embodiment, the paint B temporarily stored in the coating guns 2b and 2c is supplied from the cylinder tank 84 during the above cleaning. Specifically, as shown in FIG. 3, the paint source chamber 843 of the tank body 842 is operated by operating a drive source (not shown) and moving the rod 848 in the direction of drawing out from the drive source side (right direction in FIG. 3). The paint B temporarily stored therein is supplied to the painting guns 2b and 2c through a plurality of paint discharge sections 846,..., And the supplied paint B is applied from the painting guns 2b and 2c. A predetermined amount is discharged into a predetermined range of the object (second sub-coating step).

  (9) Next, during the second sub-coating process, the supply of the main agent A and the curing agent A to the mixer 6 is started, the paint A is supplied from the mixer 6 and the discharge of the paint B is completed. (1st main painting process. An example of the 3rd main painting process). That is, the paint of the next color is applied (an example of another paint) while the paint B is continuously applied.

  As shown in FIG. 11, the blending of the paint A is started again, and the paint A is filled up to the main CCVs 42, 44, 46 and before the paint gun 2d. In the same process as that described with reference to FIG. 4, the paint A obtained by the mixer 6 is sent to the paint passage 72 and then guided to the cylinder tank 82 through the paint inflow portion 824 (see FIG. 2). .. (See FIG. 2) and the paint passage 72, and are sent to the main CCVs 42, 44, 46 and before the paint gun 2d.

  Here, since the object to be coated has arrived at a predetermined position with respect to the coating gun 2d, the coating gun 2d is connected to the coating passage 72, the coating tip is filled with the coating A, and coating with the coating A is started.

  In the painting gun 2c, since the coating with the paint B has been completed, the main CCV 46 to the gun tip are cleaned in the same process as described in FIG. 8 in preparation for the filling of the paint A of the next color.

  In the present embodiment, the paint B temporarily stored in the paint guns 2a and 2b is applied to the paint guns 2a and 2b even while the paint A is being applied by the above cleaning and the paint gun 2d. Is supplied from the cylinder tank 84, and the supplied paint B is discharged from the coating guns 2a and 2b to a predetermined range of the object to be coated (second sub-coating step).

  As shown in FIG. 12, in the painting gun 2c, the paint pump 56 is operated and the built-in ON / OFF valve is switched, so that the main in the order of the mixer 6 → the paint passage 72 → the cylinder tank 82 → the paint passage 72. The coating material A sent to the CCV 46 is quantitatively discharged to a predetermined range of the object to be coated.

  (10) Next, while the paint A is being discharged from some of the coating guns 2c and 2d, the paint A exceeding the discharge amount is continuously supplied from the mixer 6 to temporarily supply the excess supply of the paint A. Store (first storage step).

  Similar to the description of FIG. 6, in this embodiment, even when the coating with the coating A is started with the coating guns 2 c and 2 d, the supply of the coating A to the gun tip of each of the guns 2 b to 2 d is performed at a constant flow rate. continue. As a result, the coating material A becomes excessively supplied, and the surface of the free piston 827 is moved to the driving source side (FIG. 2) in the tank body 822 of the cylinder tank 82 by the pressure of the excessive coating material A as shown in FIG. Then, it is pushed back to the left side and stored in this space 823 while creating a space (paint storage chamber) 823 between the surface of the free piston 827 and the inner wall of the tank body 822.

  The storage of the paint A in the cylinder tank 82 is performed until the necessary discharge amount of the paint A discharged by the remaining paint guns 2a to 2d including the paint guns 2a and 2b that have not yet discharged the paint A is stored. .

  Returning to FIG. 12, the coating gun 2b performs cleaning from the main CCV 44 to the gun tip in the same process as described in FIG.

  In the present embodiment, during the above cleaning and coating of the coating material A by the coating guns 2c and 2d, the coating material temporarily stored in the coating gun 2a is applied to the coating gun 2a as in FIG. B is supplied from the cylinder tank 84, and the supplied paint B is discharged from the coating gun 2a to a predetermined range of the object to be coated (second sub-coating step).

  As shown in FIG. 13, when all the coating with the paint B is completed, the entire supply path is cleaned to prevent the paint B from sticking.

  In the same process as the description of FIG. 10, the upstream side of the second mixer 64 b of the mixer 6 is cleaned. The cylinder tank 84 is also subjected to predetermined cleaning.

  Since the painting gun 2a has finished painting with the paint B, the main CCV 42 to the tip of the gun are cleaned in the same process as described in FIG.

  Since the object to be coated has arrived at a predetermined position with respect to the coating gun 2b, the coating gun 2b operates the paint pump 54 and switches the built-in ON / OFF valve, so that the mixer 6 → the paint passage 72 → the cylinder The paint A sent to the main CCV 44 in the order of the tank 82 → the paint passage 72 is quantitatively discharged into a predetermined range of the article to be coated (first main painting process).

  In the coating gun 2c arranged on the upstream side of the coating gun 2b, the quantitative discharge of the coating material A has already been started on the object to be coated.

  Since the coating with the coating A is completed in the coating gun 2d, the coating gun 2d is removed from the coating passage 72 and cleaned in preparation for filling with the one-color coating of the next color.

  (11) Next, as shown in FIG. 14, when the storage of the paint A in the cylinder tank 82 is completed, the operation of both the liquid agent pumps 57 and 58 is stopped, and the main agent A and the curing agent A are supplied to the mixer 6. Is stopped (first liquid stopping step). Then, the upstream side of the first mixer 64a of the mixer 6 is washed in the same procedure as described in FIG.

  Since the coating gun 2c has finished painting with the paint A, the main CCV 46 to the tip of the gun are cleaned in the same procedure as described with reference to FIG.

  (12) In the present embodiment, the paint A temporarily stored in the cylinder gun 82 is applied to each of the coating guns 2a and 2b in the same manner as in FIG. The coating material A supplied thereby is discharged from the coating guns 2a and 2b to a predetermined range of the object to be coated (first sub-coating step).

  When all the coatings are completed, the coating path and the coating guns 2a and 2b are washed to return to a state in which the residues of the coatings A and B do not remain.

  In the coating method of the present embodiment, the coating with the coating B can be performed while the coating with the coating A is continued, and further the coating with the coating A can be performed while the coating with the coating B is continued. That is, according to the coating method of this embodiment, two coating materials A and B can be supplied at a time and discharged from a plurality of coating guns.

  In the present embodiment, since the coating with the coating B can be performed while the coating with the coating A is performed, for example, in the plurality of coating guns installed in the top coating line of the automobile body that is continuously conveyed, While the coating gun disposed is performing coating with the paint A, the coating gun disposed on the last stage can be coated with the coating B. That is, it is possible to realize painting with different paint types at the same time.

  In addition, since painting with the next color paint B can be started before painting with paint A is completed for all painting guns, a single mixer can be shared by multiple painting guns, resulting in a large equipment size. Can be prevented.

  Furthermore, since the type of paint to be supplied can be set for each of a plurality of paint guns, there is a case where there is a deviation in the paint timing between one paint gun and another paint gun during continuous conveyance by a conveyor. However, it is possible to continuously coat the object to be coated while using the mixer 6 while changing the color.

  In the present embodiment, it is not necessary to clean the entire path from the mixer 6 to the gun tip when performing color change (paint A → paint B → paint A), and the downstream path from each main CCV 42, 44, 46. Can be washed. That is, since it is only necessary to perform cleaning with a shorter path than before, the amount of the remaining paint to be discarded can be reduced, and the cleaning loss can be reduced.

  When changing the color of paint with a conventional mixing device, the flow rate of the paint that needs to be supplied to each paint gun side is the maximum discharge amount (discharge at the time of painting) to each paint gun side at the time of color change. In some cases, the supply of paint was stopped in response to the on / off of the trigger valve built in each paint gun. In addition, in a conventional mixing device in which the main agent and the curing agent are metered to the mixer by the main agent pump and the curing agent pump, respectively, the total discharge amount for all supplied coating guns is calculated and responded to mix. There was also a concern that the paint path (hose) from the downstream side of the mixer to each coating gun could be ruptured because the amount of main agent and curing agent delivered to the vessel had to be calculated.

  In the present embodiment, even after the filling of the gun tip is completed and the flow rate of the paint necessary for discharge is reduced, the paint A is continuously supplied at a constant flow rate, and the excessive supply of paint is supplied from the mixers 64a and 64a. The cylinder tanks 82 and 84 provided in the middle of the supply paths 72 and 74 leading to the plurality of coating guns are temporarily stored and sent for resupply. For this reason, it is possible to detect a change in the discharge amount (actual usage amount) of the paint from the gun and feed back the result to the control of the supply flow rate of the main agent and the curing agent introduced into the mixer 6. 6 can be accurately mixed with the main agent and the curing agent, and there is no possibility of rupturing the paint paths 72 and 74 from the downstream side of the mixer 6 to each coating gun.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, the first main coating process is illustrated as an example of the third main coating process of the present invention, and then the first storage process → the first liquid stop process → the first sub-coating process is continued. However, in the present invention, the present invention is not limited to this, and the third main coating process may be performed by coating with paint C that is neither paint A nor paint B.

FIG. 1 is a schematic diagram showing the overall configuration of the paint supply apparatus according to the present embodiment. FIG. 2 is a partially enlarged sectional view of the cylinder tank 82 of FIG. FIG. 3 is a partially enlarged sectional view of the cylinder tank 84 of FIG. FIG. 4 is a diagram illustrating a state where mixing of the coating material A is started and filling up to the main CCV is performed in the coating method according to the present embodiment. FIG. 5 is a diagram showing a state in which the coating gun 2c and 2d are filled with the coating material A in the coating method according to the present embodiment. FIG. 6 is a diagram showing a state in which the coating A is discharged from the coating guns 2b to 2d in the coating method according to the present embodiment and the excessive supply of the coating A that is not discharged from the gun is stored. FIG. 7 is a view showing a state in which the stored amount of paint A is supplied to each gun after the supply of the paint A is completed in the coating method according to the present embodiment. FIG. 8 is a diagram showing a state where mixing of the paint B is started in the coating method according to the present embodiment, the supply to the paint gun 2d, the paint gun 2c is cleaned, and the main CCV is filled. FIG. 9 is a diagram illustrating a state in which coating of the paint B is started in the coating method according to the present embodiment, and the supply of the paint A for storage is supplied to each gun while storing the supply B of excess supply that is not discharged from the gun. . FIG. 10 is a view showing a state in which the stored amount of paint B is supplied to each gun after mixing of the paint B is completed in the coating method according to the present embodiment. FIG. 11 is a diagram illustrating a state in which coating of the coating material A is started again in the coating method according to the present embodiment, and the excessive amount of coating material A that is not discharged from the gun is stored, while the stored amount of coating material B is supplied to each gun. It is. FIG. 12 is a view showing a state in which the excessive amount of paint A that is not discharged from the gun is stored while the paint B is supplied to each gun while being coated with the paint A in the coating method according to the present embodiment. is there. FIG. 13 is a diagram showing a state in which an excessive supply of paint A that is not discharged from the gun is stored while being coated with the paint A in the coating method according to the present embodiment. FIG. 14 is a diagram showing a state in which the stored amount of paint A is supplied to each gun after the supply of paint A is completed in the coating method according to the present embodiment. FIG. 15 is a schematic diagram showing the overall configuration of a conventional paint supply apparatus. FIG. 16 is a schematic diagram showing the overall configuration of a conventional paint supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paint supply apparatus 2a-2d ... Painting gun 42, 44, 46 ... Main CCV
47, 48 ... Sub CCV
42a, 44a, 46a-48a ... Manifold 42b, 44b, 46b ... Paint type switching valve 47b, 48b ... Liquid type switching valve 42c, 44c, 46c-48c ... Cleaning liquid switching valve 42d, 44d, 46d-48d ... Air switching valve 49a , 49b ... Open / close valves 52, 54, 56 ... Paint pumps 57, 58 ... Liquid agent pump 6 ... Mixer 62 ... Manifold 62a ... Main agent inflow port 62b ... Hardener inflow port 62c ... First discharge port 62d ... Second discharge port 64a , 64b ... Mixers 72, 74 ... Paint passage 76 ... Main agent passage 78 ... Hardener passage 82, 84 ... Cylinder tank 822, 842 ... Tank body 823, 843 ... Space (paint storage chamber)
824, 844 ... Paint inflow part 826, 846 ... Paint discharge part 827, 847 ... Free piston 828, 848 ... Rod

Claims (8)

A coating method in which multi-component paint is supplied from a mixer and discharged from a plurality of coating guns.
A first main coating process in which a first multi-component paint is supplied from a mixer and discharged from a part of the coating gun;
While discharging the first multi-component paint from some of the coating guns, the first multi-component paint exceeding the discharge amount is continuously supplied from the mixer, and the first multi-component paint in excess of the supply is temporarily supplied. A first storage step for storing automatically,
A first liquid stopping step of stopping supply of a liquid necessary for obtaining the first multi-liquid paint to the mixer after storing a predetermined amount of the first multi-liquid paint;
A first sub-coating step of supplying a first multi-component paint temporarily stored and discharging from the remaining paint gun after stopping the supply of liquid to the mixer;
While the temporarily stored first multi-component paint is discharged from the remaining paint gun, the supply of the liquid necessary for obtaining the second multi-component paint to the mixer is started, and the second A second main coating step of supplying the multi-liquid paint from the mixer and discharging it from a part of the coating gun that has finished discharging the first multi-liquid paint. The coating method according to claim 1, wherein the first multi-component paint is supplied temporarily from the mixer at a constant flow rate to temporarily store the excess first multi-component paint. While the second multi-component paint is being discharged from some of the paint guns, the second multi-component paint exceeding the discharge amount is continuously supplied, and the excess second supply multi-component paint is temporarily stored. A second storage step,
A second liquid stopping step of stopping the supply of the liquid necessary for obtaining the second multi-liquid paint to the mixer after storing a predetermined amount of the second multi-liquid paint;
A second sub-coating step of supplying the second multi-component paint temporarily stored and discharging it from the remaining paint gun after stopping the supply of the liquid to the mixer;
While discharging the temporarily stored second multi-component paint from the remaining paint guns, the liquid required to obtain another multi-component paint including the first multi-component paint to the mixer And a third main coating step of starting the supply and supplying the other multi-component paint from the mixer and discharging it from a part of the coating gun after the second multi-component paint is discharged. Or the coating method of 2. The coating method according to claim 3, wherein in the second storage step, the second multi-liquid paint is continuously supplied from the mixer at a constant flow rate to temporarily store the excess second multi-liquid paint. Another multi-component paint is the first multi-component paint, and the third main coating step is the first main coating step, and thereafter, the first storage step, the first liquid stop step, the first sub-coating step, and The coating method according to claim 3 or 4, wherein the second storage step and subsequent steps are repeated through the second main coating step. The coating method according to any one of claims 1 to 5, wherein a cold crosslinking two-component curable coating obtained by mixing at least a main agent and a curing agent is used as the multi-component coating. A mixer having a plurality of mixers for supplying multi-component paint to a plurality of coating guns via a plurality of supply paths;
In the middle of a supply path from at least one mixer to each paint gun, the multi-liquid paint is temporarily stored, and storage means capable of re-supplying the multi-liquid paint after storage to each paint gun is provided. Paint supply device. The storage means includes
Connected to the supply path on the downstream side of the mixer and allowed to flow in the multi-component paint from the mixer, and connected to the plurality of supply paths on the upstream side of each coating gun, A tank body formed with a plurality of paint discharge sections that allow the liquid paint to be led out;
A free piston that is slidable inside the tank body,
An axially movable rod having one end connected to the back surface of the free piston and the other end connected to a drive source;
By pushing the free piston back to the drive source side, the multi-liquid paint flowing from the paint inflow part is temporarily stored in the space formed between the surface of the free piston and the inner wall of the tank body, and the rod is driven. 8. The paint supply apparatus according to claim 7, wherein the paint supply apparatus is configured by a cylinder tank configured to draw out the multi-liquid paint temporarily stored in the space from a plurality of paint discharge parts by moving in a direction of drawing from the side.

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