JP4768331B2 - Painting machine - Google Patents

Description

  The present invention relates to a coating machine that sprays paint supplied via a feed nozzle from an atomization mechanism provided at the tip of a body, and more particularly, a plurality of simultaneously supplied like a main agent and a curing agent of a two-component mixed paint. It is suitable for use in a coating machine that mixes and paints these paints.

  If you try to supply two-component mixed paint consisting of the main agent and curing agent after mixing in the paint tank in advance, the pot life will be relatively short, so it will harden in a short time in the paint supply system such as paint tank and paint piping. In order to prevent curing, it is troublesome that all of the paint supply system to which the mixed paint adheres must be frequently washed.

For this reason, the present applicant has proposed a coating machine having a built-in mixer that mixes such a main agent and a curing agent or two or more kinds of paints having different colors (see Patent Document 1).
JP 2001-239190 A

FIG. 8 shows such a conventional coating machine (coating machine) 41, and a tubular static mixer (pipe agitator) in a tubular rotating shaft 44 of an air motor 43 that drives a rotary atomizing head (atomizing mechanism) 42 to rotate at high speed. ) 45 is inserted in a non-contact state.
According to this, for example, when supplying a two-component mixed paint composed of a main agent and a curing agent, the main agent and the curing agent are individually supplied to the coating machine 41 and uniformly mixed in the static mixer 45, and the mixed paint. Is supplied to the rotary atomizing head 42 and is atomized.

Accordingly, it is sufficient to clean only the static mixer 45 and the rotary atomizing head 42 with which the mixed paint comes into contact. In addition, cleaning valves 48A and 48B for supplying a cleaning fluid such as cleaning liquid and cleaning air are interposed in the curing agent pipe 47B.
Then, these valves 48A and 48B are switched to wash the static mixer 45 with the cleaning fluid supplied through the main agent pipe 47A and the hardener pipe 47B, and then the rotary atomizing head with the cleaning fluid flowing out from the static mixer 45. 42 is washed.

  However, even with such frequent cleaning, the static mixer 45 has a complicated flow path structure formed by crossing fine fins, so that it is difficult to clean the inside completely. When it adheres and hardens, it peels off and is liable to cause a coating failure referred to as “pops”.

  For this reason, in order to prevent such a situation from occurring during painting, maintenance is performed every use for a certain period of time (for example, one week). However, the coating machine 41 is used by being fixed to the end of a robot arm. Therefore, at the time of maintenance, it must be removed and disassembled, and after necessary maintenance work, it must be reassembled and re-fixed to the robot arm, which makes the painting machine removal work extremely troublesome.

  In view of this, the present invention has a technical problem to enable maintenance work to be performed very easily without removing the coating machine from the robot arm.

In order to solve this problem, the present invention is a coating machine that sprays paint supplied through a feed nozzle from an atomizing mechanism provided at the tip of a body, and when a plurality of paints are supplied simultaneously. A mixing unit that mixes them and feeds them to the paint outflow port is detachably loaded into a storage space formed on the back side of the body, and an inlet of a feed nozzle is formed on the bottom surface of the storage space. The paint outflow port is pressed against the bottom of the storage space and connected to the inlet of the feed nozzle.
In the present specification, the term “paint” is not limited to a normal paint or a two-component mixed paint in which a main agent and a curing agent are mixed, but also to each of the main agent and the curing agent before mixing. A concept that includes

According to the coating machine of the present invention, the mixing unit built in the body is pressed against the bottom surface of the storage space, and the paint outflow port and the feed nozzle inflow port are simply connected, so it can be fixed to the robot arm. For example, the mixing unit can be easily taken out by pulling it out from the back side.
Therefore, it is possible to take out only the mixing unit requiring maintenance and disassemble and clean it or replace it without removing the entire coating machine.

  Here, as the mixing unit, for example, as described in claim 2, an inlet block having a plurality of inflow ports for connecting the paint hose and an outlet block having a paint outflow port are sandwiched between them. At least three blocks of the center block to be brought into close contact with each other, and different types of paint supplied from any two inflow ports are brought into contact with each other on the sliding surfaces of the inlet block and the center block. If a membrane channel is formed and a mixing channel provided with a pipe stirrer that mixes the paint that has passed through the liquid membrane channel is used on the mating surface of the center block and the outlet block, Maintenance becomes easier.

That is, by disassembling each block, the liquid film flow path where the two types of paint are mixed and the mixing flow path provided with the pipe stirrer are exposed, so that particularly the portion where the paint tends to adhere and harden is washed. There is an effect that it becomes easy.
Further, since this mixing unit has a liquid film channel formed upstream of the pipe stirrer, the paint mixed in the liquid film channel flows into the pipe stirrer, and the mixing property is also improved. Be improved.

Furthermore, if the mixing unit is pressed against the bottom surface of the storage space by the fastening lid arranged in the rear opening of the storage space as in claim 3, the k mixing unit can be easily removed by simply removing the fastening lid. Can be dismounted.
Moreover, if the loading port for taking in and out the mixing unit is formed on the side surface of the storage space as in the fourth aspect, the mixing unit can be attached and detached more easily.
If the lid of the loading port can be fixed in the closed state by the fastening lid, no means for fixing the lid is required.

  Furthermore, as in claim 5, if a taper that guides the lid body in the direction in which the lid body closely contacts the loading port with respect to the tightening direction of the fastening lid is formed at the meshing portion of the lid body and the loading port, By tightening the fastening lid, the lid is brought into close contact with the loading port, and the paint mist does not enter the storage space.

  In this example, the mixing unit can be removably loaded in the storage space on the back side of the body in order to achieve the purpose of making it possible to perform maintenance work very easily without removing the coating machine from the robot arm. did.

  FIG. 1 is an explanatory view showing an example of a coating machine according to the present invention, FIG. 2 is an explanatory view showing the structure of a mixing unit, and FIG. 3 is an explanatory view showing a loading state of the mixing unit.

A coating machine 1 shown in FIG. 1 includes a mixing unit 2 that mixes two or more separately supplied paints, and a body 4 through a feed nozzle 3 inserted through the tubular rotating shaft 7 of the air motor 6. The spray 8 is sprayed from a rotary atomizing head (atomization mechanism) 5 provided at the tip, and an attachment 8 fixed to a robot arm (not shown) protrudes from the side surface.
On the back side of the body 4, a storage space S is formed in which a mixing unit 2 for mixing a plurality of coating materials and supplying the mixture from the coating material outflow port Pout is loaded. A fastening lid 13 is formed at the rear opening 12 of the space S to connect the paint outflow port Pout to the inflow port 3in of the feed nozzle 3 by pressing the mixing unit 2 against the bottom surface 11 of the storage space S. It is arranged.

  The tightening lid 13 is provided with a push rod 14 at the center thereof, and by tightening the lid 13, the tip of the push rod 14 is pressed against the mixing unit 2, and the mixing unit 2 is brought into close contact with the bottom surface 11 of the storage space S. .

A loading port 15 for inserting and removing the mixing unit 2 is formed on the side surface of the storage space S, and a lid 16 of the loading port 15 is fixed to the closed state by the fastening lid 13.
More specifically, tapered surfaces 16 a and 15 a that guide the lid 16 in the direction in which the lid 16 is brought into close contact with the loading port 15 with respect to the tightening direction of the fastening lid 13 are formed at the meshing portion of the lid 16 and the loading port 15. Being done.
As a result, when the fastening lid 13 is tightened with the loading port 15 closed, the taper surface 16a of the lid 16 is guided to the taper surface 15a of the loading port 15, and the lid 16 is loaded. It is in close contact with the mouth 15.

The mixing unit 2 includes an inlet block B _{1 in} which a plurality of inflow ports P _{1 to} P ₆ for connecting the paint hose H, an outlet block B ₃ in which a paint outflow port Pout is formed, and a center block sandwiched between them. At least three blocks B _{1 to} B ₃ of B ₂ are provided, and the push rod 14 of the fastening lid 13 is pressed against the inlet block B _{1 so} that the blocks B _{1 to} B ₃ are brought into close contact with each other. Has been made.

Each paint hose H is connected to a color change valve (not shown) for controlling the start / stop of the supply of each paint, and a check valve CV built in each of the inflow ports P _{1 to} P ₆ is provided when the paint is supplied. The paint is opened and supplied to the mixing unit 2.
The check valve CV of this example is replaced with a spring, and a magnetic force urging provided with a magnet 33 that presses a spherical valve body 31 made of a magnetic material against a valve seat 32 formed by flaring the tip of a paint hose H. A type of valve is used.

A liquid film flow path 21 is formed on the surface where the inlet block B ₁ and the center block B ₂ are brought into contact with different kinds of paints supplied from any two inflow ports P _{1 to} P _{6 in the} form of a film. At the same time, a mixing channel 23 provided with a static mixer 22 for mixing the paint that has passed through the liquid film channel 21 is formed on the mating surfaces of the center block B ₂ and the outlet block B ₃ .

Ekimakuryuro 21 has a downward conical convex surface 21a formed on the inlet block B ₁ side, the two sides of the downward concave conical surface 21b formed on the center block B ₂ side overlaid with clearance of about 1mm It is formed in a conical dish type space.
A valve chamber 34 of the check valve CV of the inflow ports P _{1 to} P ₆ is communicated with the upper annular portion (peripheral portion) 24, and an outlet 26 communicating with the static mixer 22 is formed at the lower end side vertex 25. ing.

Static mixer 22, by placing the center blocks B ₂ and the outlet block B plastic or metal circulating fin 27 to the mixing flow path 23 becomes substantially an annular groove 23a and 23b formed on the ground glass surface of the ₃ It is configured.

Thus, for example, when the main agent S and the curing agent K are supplied from the pair of inflow ports P ₂ and P ₅ , the main agent and the curing agent spread in the liquid film channel 21 and start to mix in line contact as shown in FIG. And sequentially sent to the static mixer 22.
And it mixes uniformly with the static mixer 22, and is supplied to the rotary atomization head 5 through the feed nozzle 3 from the coating material outflow port Pout.

In addition to the inflow ports P _{1 to} P ₆ to which the paint hose H is connected, the inlet block B ₁ is provided with a cleaning fluid port P ₀ for supplying a cleaning fluid, and the cleaning that has flowed in from the cleaning fluid port P ₀ is provided. The fluid is supplied into the valve chamber 34 of the check valve CV of each of the inflow ports P _{1 to} P ₆ via the cleaning fluid channel 28 so that the inside of the check valve CV can be cleaned.

The above is the configuration of the present invention, and its operation will be described next.
When performing maintenance, the cleaning fluid is supplied from the cleaning fluid port P ₀ with the coating machine 1 attached to the robot arm (not shown), and adheres to the mixing unit 2, the feed nozzle 3 and the rotary atomizing head 5. Wash the paint.

Then, in a state where each color change valve (not shown) is closed, the fastening unit 13 that fixes the mixing unit 2 to the bottom surface 11 of the storage space S is removed, and the loading port 15 on the side surface is opened. 2 can be easily taken out.
In addition, if the paint hose H is long and has a margin, the paint hose H can be pulled out of the storage space S without being removed from the inflow ports P _{1 to} P ₆ .

At this time, the mixing unit 2, the inlet block _{B 1,} the center block _{B 2,} it is possible to decompose the outlet block _{B 3,} may be washed for each block _B 1 ~B _3.
In addition, by disassembling each of the blocks B _{1 to} B ₃ , the liquid film channel 21 formed on the surface where the inlet block B ₁ and the center block B ₂ are aligned has a downward conical convex surface 21 a and a downward conical concave surface 21 b. Therefore, the inside of the narrow liquid film channel 21 having a clearance of 1 mm in the assembled state can be easily disassembled and washed.
Further, the mixing flow path 23 formed on the mating surface of the center block B ₂ and the outlet block B ₃ is disassembled into substantially annular concave grooves 23a and 23b, and the stirring fins 27 of the static mixer 22 are exposed. And the inside of the mixing channel 23 can be cleaned, and the stirring fins 27 can be easily taken out and cleaned, and can be exchanged as necessary.

Then, the stirring fin 27 is put in the mixing flow path 23, the blocks B _{1 to} B ₃ are overlapped, put into the storage space S, and the fastening lid 13 is closed with the lid 16 of the loading port 15 closed. If tightened, the lid body 16 is pushed by the fastening lid 13 and tries to move to the tip side. Since it is guided in the direction in which it is in close contact with the port 15, the loading port 15 is closed airtight by the lid 16.
Further, the pushing rod 14 of the tightening lid 13 presses the mixing unit 2 against the bottom surface 11 of the storage space S, thereby integrating the blocks B _{1 to} B ₃ , and the paint outflow port Pout is the inlet of the feed nozzle 3. As it is connected to 3in, assembly is very easy.

Note that when the ports _P 1 to P _6, to supply the coating material to be mixed to the port _{P 1} and _P 4, _{P 2} and _P 5, _{P 3} and _{P 6} facing (e.g. base and curing agent) Not limited to this, a paint hose H of a paint supplied alone without being mixed may be connected.
The same color paint hose H... Is connected to the opposite paint inflow ports P ₁ and P _{4 and the} like, and when the remaining amount of paint in one supply system is low, supply of the same color paint in the other supply system is started. If mixed supply is performed, it is difficult to cause breathing that the paint does not come out at the moment of switching the supply system.
In this case, even if there is a slight difference in hue etc. due to the difference in production lot etc., the difference is diluted by simultaneously supplying and mixing two or more same color paints, so during painting Even if the supply of paint from one supply system is stopped, the hue or the like does not change so as to be visually recognized.

  As described above, the present invention is applied to the application of a coating machine that mixes two or more individually supplied paints and sprays the mixed paint from the atomizing mechanism provided at the tip of the body via the feed nozzle. In particular, it is suitable for use in a coating machine in which a main component of a two-component mixed paint and a curing agent are mixed and applied.

Sectional drawing which shows an example of the coating machine which concerns on this invention. The external view. The figure which shows the state which open | released the storage space. Sectional drawing which shows a mixing unit. The top view which shows a mixing unit. Explanatory drawing which shows the static mixer which shows a mixing unit. Explanatory drawing which shows the flow in a liquid film flow path. Explanatory drawing which shows a conventional apparatus.

Explanation of symbols

1 Coating machine 2 Mixing unit 3 Feed nozzle 4 Body 5 Rotating atomizing head (Atomizing mechanism)
Pout Paint outflow port S Storage space 11 Bottom surface 12 Rear opening
13 Lid tightening 15 loading opening 16 lid _P 1 to P ₆ inlet port _{B 1} Inlet block _{B 2} center block _{B 3} Outlet block 21 Ekimakuryuro 22 static mixer

Claims (5)

A coating machine that sprays paint supplied through a feed nozzle from an atomization mechanism provided at the tip of the body,
When a plurality of paints are supplied simultaneously, a mixing unit that mixes them and sends them to the paint outflow port is detachably loaded in the storage space formed on the back side of the body,
An inflow port of a feed nozzle is formed in the bottom surface of the storage space, and the mixing unit is pressed against the bottom surface of the storage space, and the paint outflow port is connected to the inflow port of the feed nozzle. . In the mixing unit, at least three blocks of an inlet block formed with a plurality of inflow ports for connecting a paint hose, an outlet block formed with a paint outflow port, and a center block sandwiched therebetween are arranged in close contact with each other. And
A liquid film flow path is formed on the sliding surface of the inlet block and the center block to contact the paint supplied from any two inflow ports in the form of a film. The coating machine according to claim 1, wherein a mixing flow path is provided in which a pipe stirrer for mixing the paint that has passed through the liquid film flow path is disposed.   The coating machine according to claim 1, wherein the mixing unit is pressed against the bottom surface of the storage space by a fastening lid disposed at a rear opening of the storage space.   The coating machine according to claim 3, wherein a loading port for inserting and removing the mixing unit is formed on a side surface of the storage space, and a lid body of the loading port is fixed in a closed state by the fastening lid. The said cover body is meshed | engaged with the loading port, The taper which guides the lid body to the direction which closely_contact | adheres to a loading port with respect to the fastening direction of the said clamping lid is formed in the meshing part. Painting machine.

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