JP6030735B2 - Painting equipment - Google Patents

Description

  The present invention relates to a coating apparatus for applying a coating material composition to the surface of an object by operating an injection means (injection gun) regardless of whether it is movable property or real estate.

  In Patent Document 1, “a diluting solvent (thinner) used in organic solvent-based spray coating, in carbon dioxide coating in which part or all of carbon dioxide is replaced, is used as a paint supply line. Supply carbon dioxide with a paint high pressure pump that pressurizes the paint supplied from the tank to a predetermined pressure, a paint primary pressure adjustment valve that adjusts the discharge pressure of the paint high pressure pump and returns the excess to the paint tank. As a line, a tank that stores liquid carbon dioxide, a cooler that cools the liquid carbon dioxide to a predetermined temperature, a liquid carbon dioxide high-pressure pump that pressurizes liquid carbon dioxide supplied from the cooler to a predetermined pressure, and the liquid dioxide It has a liquid carbon dioxide primary pressure adjustment valve that adjusts the discharge pressure of the carbon high-pressure pump and returns the surplus to the suction of the pump. As a mixture line, a pressurized paint supplied from the paint supply line, a mixer for mixing the pressurized carbon dioxide supplied from the carbon dioxide supply line, and after mixing supplied from the mixer A carbon dioxide characterized by having a spray gun that heats a paint / carbon dioxide pressurized mixture of the above to a coating object under atmospheric pressure via a stop valve by heating with a mixture heater if necessary "Painting device using" ".

  The known invention 1 of the above-mentioned Patent Document 1 uses a mixture heater, which is connected to a spray gun via a stop valve after the heater, and the heated mixture reaches the spray gun. In some cases, the coating material may be cooled during this period, and a paint having an appropriate viscosity cannot be supplied to the spraying means.

  In addition, the well-known invention described in Patent Documents 2 to 4 does not describe a coating apparatus that can supply a paint having an appropriate viscosity to the spraying means.

JP 2010-234348 A JP 2010-234349 A JP 2012-86150 A JP 2012-86151 A

  The present invention has been made in view of the above-described conventional drawbacks, and an object thereof is to provide a coating apparatus capable of supplying a paint having an appropriate viscosity to an injection unit.

In order to achieve the above object, a coating apparatus of the present invention includes an air supply line, a paint drive pump that uses air supplied from the air supply line as a drive source, the paint drive pump, and a paint supply source. A paint supply line for supplying paint to the mixer, a carbon dioxide drive pump, a carbon dioxide supply line for supplying carbon dioxide to the mixer, the drive pump for carbon dioxide and a carbon dioxide supply source, Connected to the paint supply line and the carbon dioxide supply line, mixed with both components of the paint and the carbon dioxide to produce a coating composition, connected to the mixer with a spray hose, and It is a coating apparatus provided with the injection means which injects the said coating | covering material composition, Comprising: The said carbon dioxide supply line contains either a pressure control valve or a flow control valve at least. Comprising carbon oxides metering mechanism on the downstream side of the carbon dioxide for driving the pump, the mixer and covers the entire discharge hose connecting the injection means, the temperature of the coating composition within the discharge hose, said injection means It is characterized by having a temperature adjustment mechanism that adjusts the temperature so that a predetermined viscosity is obtained immediately before.

As is clear from the above description, the present invention has the following effects.
(1) In the first aspect of the invention, the coating material has a temperature adjustment mechanism for adjusting the temperature of the coating material composition (a mixture of paint and carbon dioxide) in the injection hose to a predetermined temperature. The temperature of the composition can be set to an appropriate temperature, and the viscosity of the coating material composition can be set to an appropriate viscosity.
Therefore, the coating material composition can be efficiently sprayed on the object to be coated.
(2) Since the carbon dioxide quantitative supply mechanism is provided, the quantitative property can be improved.
(3) The invention according to claim 2 can achieve the same effects as the above (1) to (2), and can make the viscosity of the paint more suitable.
(4) The invention according to claim 3 can achieve the same effects as the above (1) to (3), can perform more stable temperature control, and injects or discharges the temperature control medium in the vicinity of the injection means. The temperature can be adjusted without adding piping or the like.
(5) The invention according to claim 4 can achieve the same effects as the above (1) to (4), and even when the injection means and the mixer are installed in the explosion-proof area, Adjustments can be made.
(6) The invention according to claim 5 can achieve the same effects as the above (1) to (5), and can further improve the quantitativeness.
(7) The invention according to claim 6 also provides the same effects as the above (1) to (6), and the ON / OFF of the injection means is detected by the detection means, and the gate valve is automatically opened and closed. Can do.

1 to 4 are explanatory views showing a first embodiment of the present invention.
5 and 6 are explanatory views showing a second embodiment of the present invention.
FIG. 7 is an explanatory view showing a third embodiment of the present invention.
Schematic explanatory drawing. Schematic explanatory drawing of a paint supply line. Schematic explanatory drawing of a carbon dioxide supply line. Explanatory drawing of a temperature control mechanism. Schematic explanatory drawing. Explanatory drawing of a temperature control mechanism. Schematic explanatory drawing.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.
In the first embodiment for carrying out the present invention shown in FIG. 1 to FIG. 4, reference numeral 1 denotes a coating apparatus according to the present invention. The coating apparatus 1 is a metal / synthetic resin regardless of whether it is movable or real estate. Regardless of whether it is made of concrete or concrete, a coating composition is applied to the surface of a robot, various machines and parts thereof, electric appliances and parts thereof, wall surfaces of buildings, and the like.

  The coating apparatus 1 includes an air supply line 2, a paint drive pump 3 that uses air supplied from the air supply line 2 as a drive source, a paint drive pump 3, and a paint supply source 4. A carbon dioxide supply line 7 for supplying the paint 6 to 5, a carbon dioxide drive pump 8, a carbon dioxide drive pump 8, and a carbon dioxide supply source 9. A supply line 11, connected to the paint supply line 7 and the carbon dioxide supply line 11, the mixer 5 for mixing the components of both the paint 6 and the carbon dioxide 10 to produce a coating composition 12; The mixer 5 is connected by a paint hose 13 and is composed of spraying means 14 for spraying the coating material composition 12 (for example, a spray gun for manually spraying).

  The paint drive pump 3 is activated by drive air, and one or a plurality of paint supply sources 4 are connected to the paint drive pump 3 via a paint connection line (pipe) 15. ing.

  Therefore, when the paint driving pump 3 is activated by driving air, the paint 6 of the paint supply source 4 is sucked from the suction port, and the paint 6 is pumped from the discharge port. Therefore, the paint driving pump 3 is a paint high-pressure pump that sucks and discharges the paint 6. The paint supply line 7 includes a paint supply source 4, a paint connection line 15, the paint drive pump 3, and a paint discharge line 16. The paint discharge line 16 is connected to the paint drive pump 3 and a mixer ( The paint discharge line 16 is connected to the mixing unit 5, and the paint discharge line 16 supplies the mixer 5 with the paint fed from the paint drive pump 3.

  As an example of the painting drive pump 3, SP1021, SP1628, SP1636, SP1844, SP1854 (Z), SP1878, SP2544, SP2554 (Z), SP2578, etc., which are pneumatic plunger pumps manufactured by Asahi Sunac Corporation. It can be used appropriately.

  The function of the mixer 5 will be described. By the way, the detailed structure of the mixer 5 is preferably an appropriate micromixer in consideration of the channel diameter. The type and structure of the micromixer are well known matters (for example, paragraphs 0031 to 0033 of JP 2010-234348 A), and are therefore omitted.

  The mixer 5 is disposed downstream of a carbon dioxide discharge line 18 having a check valve 17 and a paint discharge line 16 having a check valve 19. The mixer 5 is connected to the paint drive pump 3 through the paint discharge line 16. Both components of the obtained paint 6 and the carbon dioxide 10 obtained from the carbon dioxide discharge line 18 are mixed to produce a coating material composition. Moreover, the spraying means 14 marketed is used for the spraying means 14 mentioned above, this spraying gun 14 is connected with the said mixer 5 via the spraying hose 13, and the coating material composition 12 produced | generated with the mixer 5 is used. Is sprayed onto the object to be coated 20 under atmospheric pressure.

  By the way, this injection hose 13 is provided with a temperature adjusting mechanism 21 that adjusts the temperature of the coating material composition 12 in the injection hose to a predetermined temperature, and the viscosity of the coating material composition 12 in the injection hose is injected. Immediately before the means 14, 0.01 Pa · s to 0.20 Pa · s (within 60 seconds in terms of Iwata cup viscometer), more preferably 0.01 Pa · s to 0.10 Pa · s (in terms of Iwata cup viscometer, 30 seconds) Temperature).

  The temperature control mechanism 21 is provided with a triple pipe heat exchanger 22 provided so as to cover the whole of the injection hose 13 and the triple pipe heat exchanger 22, and the coating material composition in the injection hose 13. 12 and a temperature control medium 23 such as water, air, or gas for heat exchange.

  In the present embodiment, the temperature adjusting medium 23 uses water. By using water as the temperature control medium 23, unlike temperature control using an electric heater or the like, it is safe even in an explosion-proof area and temperature control can be performed at a temperature lower than room temperature.

In addition, a part of the injection hose 13 may be covered as long as it can be adjusted to a temperature at which the viscosity of the coating material composition 12 becomes a predetermined viscosity immediately before the injection means 14.
As shown in FIG. 4, in the triple pipe heat exchanger 22, a spray hose 13 is arranged in a central pipe 22a, and a temperature control medium supply unit provided on the mixer 5 side in an intermediate pipe 22b. This is a passage through which the temperature control medium 23 supplied from 24 flows. The outermost tube 22c communicates with the intermediate tube 22b, and the temperature control medium 23 that has passed through the intermediate tube 22b turns back immediately before the injection means 14 and flows to the mixer 5 side. The passage is discharged from the temperature control medium discharge unit 25 provided.

By using such a triple-pipe heat exchanger 22, it is not necessary to provide a temperature control medium discharge portion 25 for discharging the temperature control medium 23 in the vicinity of the injection means 14, and an intermediate position adjacent to the injection hose 13. The temperature of the temperature control medium 23 in the tube 22b can be stabilized.
The temperature control medium 23 discharged from the temperature control medium discharge unit 25 may be discarded as it is (in the case of air, released to the atmosphere), but between the temperature control medium discharge unit 25 and the temperature control medium supply unit 24. The temperature control medium 23 may be circulated by connecting the compressor and the temperature control medium 23 to a supply temperature via a temperature control unit.

  The carbon dioxide driving pump 8 employs a pump that is activated by driving air, and a carbon dioxide supply source 9 is connected to the carbon dioxide driving pump 8 via a carbon dioxide connection line (pipe) 26. ing. The carbon dioxide supply source 9 may be a portable cylinder or a stationary tank requiring a capacity of 1 m3 or more, and the form of the supply source is not particularly limited in the present invention. Moreover, the property of the supplied carbon dioxide 10 may be any property.

  When the carbon dioxide driving pump 8 is activated by driving air, the carbon dioxide 10 is sucked from the carbon dioxide supply source 9 through the suction port, and the gaseous carbon dioxide 10 is pumped from the discharge port. Therefore, the carbon dioxide drive pump 8 is a high-pressure pump that sucks and discharges the carbon dioxide 10. The carbon dioxide supply line 11 includes a carbon dioxide supply source 9, a carbon dioxide connection line 26, the carbon dioxide drive pump 8, and a carbon dioxide discharge line 18. The carbon dioxide discharge line 18 is for carbon dioxide. This carbon dioxide discharge line 18 connects the drive pump 8 and the mixer (mixing unit) 5, and the carbon dioxide discharge line 18 supplies carbon dioxide pumped from the carbon dioxide drive pump 8 to the mixer 5. The carbon dioxide properties at this time are not particularly limited, and may be gas or other properties.

The carbon dioxide discharge line 18 located on the downstream side of the carbon dioxide supply line 11 (secondary side of the carbon dioxide drive pump 8) includes a carbon dioxide quantitative supply mechanism 27.
In the present embodiment, the carbon dioxide quantitative supply mechanism 27 is supplied to the secondary pressure control valve 28, the flow meter 29, the flow rate control valve 30, the gate valve 31, and the mixer 5 that adjust the secondary pressure of the carbon dioxide drive pump 8. And a primary pressure adjusting valve 32 that adjusts the primary pressure of the supplied carbon dioxide. By providing these devices on the secondary side of the carbon dioxide drive pump 8, the quantitative supply accuracy can be improved.

  By the way, the order in which these are arranged is the order of the secondary pressure regulating valve 28, the flow meter 29, the flow regulating valve 30, the gate valve 31, and the primary pressure regulating valve 32 from the upstream side.

The flow meter 29 and the flow rate control valve 30 may constitute a carbon dioxide quantitative supply mechanism 27 using an integral type, and the primary pressure, the secondary pressure, the opening degree, and the orifice of the flow rate control valve 30 are provided. When the flow rate is set in advance, the carbon dioxide quantitative supply mechanism 27 may be configured without using the flow meter 29.

The gate valve 26 is not necessarily provided, and even when the flow meter 29 and the gate valve 31 are provided, the flow meter 29 and the gate valve 31 can be provided in any order.

The carbon dioxide quantitative supply mechanism 27 may be provided with only one of the secondary pressure regulating valve 28 or the primary pressure regulating valve 32 , or may be provided with only the flow rate regulating valve 30 without providing them. That is, at least one of the pressure adjustment valve (secondary pressure adjustment valve 28 or primary pressure adjustment valve 32 ) or the flow rate adjustment valve 30 may be provided.

  A pressure regulating valve (not shown) is provided between the carbon dioxide supply source 9 of the carbon dioxide connection line 26 and the carbon dioxide drive pump 8 located upstream of the carbon dioxide supply line 11 (primary side of the carbon dioxide drive pump 8). ) May be further provided. By providing a pressure regulating valve on the primary side of the carbon dioxide drive pump 8 as well, the quantitative supply accuracy can be further improved.

  When the air supply line 2 of the paint supply line 7 is provided with a flow sensor as the detecting means 33 and the air supply amount of the air supply line 2 decreases, the gate valve 31 and the like of the carbon dioxide quantitative supply mechanism 27 are operated, A control unit 34 that stops the supply of carbon dioxide is provided. The control unit 34 is desirably provided in a non-explosion-proof area.

[Different forms for carrying out the invention]
Next, different modes for carrying out the present invention shown in FIGS. 5 to 7 will be described. In the description of the different embodiments for carrying out the present invention, the same components as those in the first embodiment for carrying out the present invention are denoted by the same reference numerals, and redundant description is omitted.

  The second embodiment for carrying out the present invention shown in FIGS. 5 and 6 is mainly different from the first embodiment for carrying out the present invention in that a double-pipe heat exchanger 35 is used. Even with such a coating apparatus 1A in terms of the temperature adjustment mechanism 21A, the same effects as those of the first embodiment for carrying out the present invention can be obtained.

  As shown in FIG. 6, in the double pipe heat exchanger 35, the injection hose 13 is arranged in the central pipe 35a, and the temperature adjusting medium supplied to the injection means 14 is supplied to the intermediate pipe 35b. The temperature control medium 23 is supplied from the section 24, flows to the mixer 5 side, and is a passage discharged from the temperature control medium discharge section 25 provided on the mixer 5 side.

  If the temperature control medium 23 is a medium that can be discharged to the atmosphere, such as air, a temperature control medium supply unit 24 is provided on the mixer side, and a temperature control medium discharge unit 25 is provided on the injection means 14 side. The temperature control medium 23 may be discharged from the means 14 side.

  Further, the temperature control medium 23 may be circulated by connecting the compressor and the temperature control medium 23 between the temperature control medium discharge section 25 and the temperature control medium supply section 24 via a temperature control section for adjusting the supply temperature. .

  The third embodiment for carrying out the present invention shown in FIG. 7 is mainly different from the first embodiment for carrying out the present invention in that a detecting means 33A for detecting the coating object 20 by the spraying means 14. Even in the case of such a coating apparatus 1B, the book can be controlled by the control unit 34 so that the gate valve 31 is opened only when the detection means 33A detects the coating object 20. The same effect as the first embodiment for carrying out the invention can be obtained.

  In addition, by providing the detection means 33A for detecting the coating object 20 in the injection means 14 in this manner, the injection object 14 (for example, an automatic opening and closing type) is used to remove the coating object 20 flowing on the conveyor, for example, using a robot or the like. When the spray gun) is operated and painted, the coating object 20 that has flowed is detected by the detection means 33A (for example, an infrared sensor) and painted, so that the coating object 20 is in front of the spray means 14. Only paint can be sprayed.

  In the embodiment of the present invention, the air supply line or the jetting means is provided with the detection means. However, the present invention is not limited to this, and the paint discharge line is provided with a flow rate sensor as the detection means. The change in flow rate may be detected, or a limit switch as a detection means is provided in the injection means to detect the state of grasping the trigger of the injection means, and control to operate the gate valve etc. Alternatively, an output signal from a higher-level control device (such as a production line control computer) may be detected and controlled to operate a gate valve or the like.

  Further, the control unit may be a control unit that stores a control program in a storage unit and controls the gate valve based on the program, or a control using a relay circuit or the like (without a storage unit or the like). It is good also as a part.

Further, in the embodiment of the present invention, although carbon dioxide for driving the pump has been described as an air drive, this invention is not limited thereto, such as an electric pump may be a pump other than air driving.

  The present invention is used in the industry for manufacturing coating equipment.

1, 1A, 1B: coating equipment, 2: air supply line,
3: Paint drive pump, 4: Paint supply source,
5: Mixer, 6: Paint,
7: Paint supply line, 8: Carbon dioxide drive pump,
9: carbon dioxide supply source, 10: carbon dioxide,
11: Carbon dioxide supply line, 12: Coating material composition,
13: injection hose, 14: injection means,
15: Paint connection line, 16: Paint discharge line,
17: Check valve, 18: Carbon dioxide discharge line,
19: Check valve, 20: Paint object,
21, 21A: temperature control mechanism, 22: triple tube heat exchanger,
23: Temperature control medium, 24: Temperature control medium supply unit,
25: Temperature control medium discharge part, 26: Carbon dioxide connection line,
27: Carbon dioxide quantitative supply mechanism, 28: Secondary pressure regulating valve ,
29: flow meter, 30: flow control valve 31: gate valve 32: primary pressure control valve ,
33, 33A: detection means, 34: control unit,
35: Double tube heat exchanger.

Claims (6)

An air supply line; a paint drive pump that uses air supplied from the air supply line as a drive source; a paint supply line that includes the drive pump for paint and the paint supply source and supplies paint to the mixer; A carbon drive pump, a carbon dioxide supply line that includes the carbon dioxide drive pump and a carbon dioxide supply source, and supplies the carbon dioxide to the mixer, and is connected to the paint supply line and the carbon dioxide supply line, and the paint A coating apparatus comprising: a mixer that mixes both components of carbon dioxide and carbon dioxide to produce a coating composition; and a spraying device that is connected to the mixer with a spray hose and sprays the coating composition. there are, in the carbon dioxide supply line, the carbon dioxide drive port carbon dioxide dispensing mechanism including at least either the pressure control valve or flow control valve Provided on the downstream side of the up to cover the entire discharge hose connecting the injection unit and the mixer, the temperature of the coating composition within the discharge hose, the temperature such that the predetermined viscosity just before the injection means A coating apparatus characterized by having a temperature adjustment mechanism that adjusts to a temperature. 2. The coating according to claim 1, wherein the temperature adjusting mechanism adjusts the temperature so that the viscosity of the coating material composition in the injection hose becomes 0.01 Pa · s to 0.20 Pa · s. apparatus. The coating apparatus according to claim 1, wherein the temperature adjustment mechanism is a triple pipe heat exchanger. 4. The method according to claim 3, wherein water, air, or an inert gas is used as a temperature control medium that flows through the triple-pipe heat exchanger of the temperature control mechanism and performs heat exchange with the coating composition. The coating equipment described. The carbon dioxide quantitative supply mechanism is configured to adjust a primary pressure of a carbon dioxide supplied to a secondary pressure adjusting valve, a flow rate adjusting valve, a gate valve and a mixer that adjust a secondary pressure of the carbon dioxide driving pump. The coating apparatus according to claim 1, comprising a valve. The coating apparatus according to claim 5, further comprising a detection unit that controls opening and closing of the gate valve based on a detection signal of the detection unit.

Images