JP2005087947A - Coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely supply liquid at a fixed flow rate to a mixer. <P>SOLUTION: Direction control valves 30A, 30B, 30a and 30b for optionally switching a communicating state for communicating hoses 15A, 15B, 15a and 15b with the mixer 28 and a blocking state for blocking the communication are provided between the hoses connected respectively to quantitative supply means 10A, 10B, 10a, 10b for discharging the liquid (essential agents A and B and curing agents (a) and (b)) at the fixed flow rate and the mixer 28. At the supply of the liquid, the diameter expansion and the deformation of the hoses 15A, 15B, 15a and 15b due to the discharge pressure of the liquid are prevented and the flow rate of the liquid to be supplied to the mixer 28 is never made lower than the discharge quantity from quantitative supply means 10A, 10B, 10a, 10b by switching to the communicating state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coating apparatus that mixes and discharges a plurality of liquid agents.

  For example, in a coating device that supplies separately the main agent and curing agent stored separately to the mixer and discharges them as paint from the coating gun in a mixed state with the mixer, the main agent and curing agent are mixed at a predetermined mixing ratio. Therefore, a flow meter is provided in the middle of the supply path of the main agent and the curing agent.

  In such a coating apparatus, when the main agent and the curing agent are mixed, the curing of the coating starts immediately thereafter, so the mixer is provided integrally with the coating gun in the coating booth. On the other hand, the flow meter is arranged at a position different from the painting gun in order to reduce the weight of the painting gun. In this case, the flow meter and the paint gun are connected by a flexible hose so as not to disturb the movement of the paint gun.

In addition, there exists a thing disclosed by patent document 1 as a coating apparatus which mixes and discharges two liquid agents.
JP 2003-39017 A

  In the case of the above conventional coating apparatus, it is necessary to prevent the mixed paint from flowing backward to the main agent side hose or the hardener side hose at the connection portion between the downstream end of each hose and the inflow portion of the mixer. For this reason, a check valve has been provided as a backflow prevention means.

  However, when the main agent or curing agent is pumped from the flow meter to the hose, the hose expands and deforms until the pressure in the hose exceeds the check valve cracking pressure (minimum pressure for opening the check valve). become. For this reason, the flow rate of the main agent or curing agent passing through the check valve is lower than the pumping flow rate from the flow meter, or the check valve remains unopened when the flow rate of the main agent or curing agent is small. There is a problem that the main agent and the curing agent cannot be mixed at a predetermined mixing ratio.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to ensure that a liquid agent having a predetermined flow rate can be supplied to a mixer.

  As means for achieving the above object, the invention of claim 1 has a plurality of fixed amount supply means for discharging a liquid agent at a predetermined flow rate and a flexibility connected to discharge ports of the plurality of fixed amount supply means. A coating apparatus comprising: a plurality of hoses; and a mixer that mixes and supplies the plurality of types of liquid agents pumped alternately or sequentially from the plurality of quantitative supply means through the plurality of hoses to the coating gun. The communication between the downstream end of the hose and the mixer is in communication between the hose and the mixer, and the shut-off state is to block communication between the hose and the mixer. A switching means that can arbitrarily switch between them is provided.

  According to a second aspect of the present invention, in the one according to the first aspect, only the liquid agent is allowed to pass from the constant amount supply means side to the hose side between the constant amount supply means and the upstream end of the hose. It is characterized in that a check valve is provided.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the switching means includes a plurality of inflow ports to which the hose can be connected and a single outflow port connected to the mixer. The directional control valve has a feature.

  A fourth aspect of the invention is characterized in that, in the third aspect of the invention, a cleaning liquid supply means for supplying a cleaning liquid is connected to the inlet of the directional control valve.

<Invention of Claim 1>
When supplying a predetermined liquid agent among a plurality of types to the mixer, the switching means connected to the hose that becomes the flow path of the liquid agent is brought into communication and connected to the hose that becomes the flow path of the other liquid agent The switching means that has been turned on is kept in a shut-off state. In this state, the liquid agent discharged from the quantitative supply means passes through the hose and the switching means in order, and is sent into the mixer. At this time, since the liquid agent is communicated between the inside of the hose and the mixer in a state in which the liquid agent can smoothly flow, the hose does not deform and expand due to the discharge pressure of the liquid agent. Therefore, the flow rate of the liquid agent fed into the mixer does not fall below the discharge amount from the quantitative supply means, and a plurality of liquid agents can be reliably mixed at a predetermined ratio. Moreover, after the liquid agent of a predetermined flow rate is sent to the mixer, the backflow from the mixer to the hose is prevented by switching the switching means to the shut-off state.

<Invention of Claim 2>
By providing the check valve, the liquid agent in the hose is prevented from flowing back to the metering supply means side.

<Invention of Claim 3>
Since a plurality of hoses can be connected to the direction control valve, a plurality of liquid agents can be supplied to the mixer by one direction control valve.

<Invention of Claim 4>
A plurality of liquid agents circulate through one directional control valve. When switching the circulated liquid agent, it is possible to prevent a mixture of different liquid agents by flowing the rinsing liquid through the directional control valve for cleaning. Further, since the object to be cleaned is not the entire distribution route of the liquid agent, but only on the downstream side of the direction control valve where the flow paths of the plural types of liquid agent are joined, the amount of the liquid agent discarded along with the cleaning, and The amount of cleaning liquid can be reduced.

<Embodiment 1>
A first embodiment embodying the present invention will be described below with reference to FIG.

  In the coating apparatus of the present embodiment, the main agent A or B (liquid agent which is a constituent element of the present invention) and the curing agent a or b (liquid agent which is a constituent element of the present invention) are respectively provided in a fixed amount supply means 10A, 10B, 10a. , 10b are alternately pumped to the mixer 28 through flexible hoses 15A, 15B, 15a, 15b by a predetermined flow rate, and the main agent A or B and the curing agent a or b mixed in the mixer 28 are supplied. The paint is supplied to the paint gun 29 as a paint. Two types of main agents A and B are prepared, and one of the main agents A or B is supplied to the coating gun 29 according to the coating conditions. Two types of curing agents a and b are also prepared, and like the main agents A and B, either one of the curing agents a or b is supplied to the coating gun 29 according to the coating conditions. The coating gun 29 and the mixer 28 are provided so as to be able to move together, and the quantitative supply means 10A, 10B, 10a, 10b are installed at positions away from the coating gun 29 and the mixer 28. The reason for using the flexible hoses 15A, 15B, 15a, and 15b is to prevent the movement of the coating gun 29 from being hindered.

  One main agent A is stored in a tank 16A, and an upstream end of a pressure feed path 19A in which a diaphragm pump 17A and a pressure control valve 18A are interposed is connected to the tank 16A. A fixed amount supply means 10A is connected to the downstream end. Further, the upstream end of a supply path 22 having a diaphragm pump 21 interposed in the middle thereof is connected to the tank 20 for the cleaning liquid, and the downstream end of the supply path 22 is connected to the quantitative supply means 10A.

  The cleaning liquid supply path 22 has flexibility and is branched into six in the middle. Each supply path 22 has a direction switching valve 11A for the main agent A and a direction switching for the main agent B described later. Valve 11B, direction switching valve 11a for curing agent a to be described later, direction switching valve 11b for curing agent b to be described later, direction control valve 30A for main agents A and B, direction control valve 30a for curing agents a and b It is connected to the. The two supply paths 22 connected to the direction control valves 30A, 30a, the cleaning liquid tank 20, and the diaphragm pump 21 constitute a cleaning liquid supply means 23 for supplying the cleaning liquid to the direction control valves 30A, 30a.

  The air pressure supply source 24 is connected to the upstream ends of a plurality of air hoses 25, and the downstream ends of the two air hoses 25 are respectively connected to the diaphragm pumps 17A, 17B, 17a, 17b, and 21. Connected to the control valves 18A, 18B, 18a, 18b.

  The metering supply means 10A for the main agent A includes a direction switching valve 11A having two inflow ports and one discharge port, and a flow meter 12A connected to the discharge port of the direction switching valve 11A. Yes. One inflow port is connected to the downstream end of the main agent A pressure feed path 19A, and the other inflow port is connected to the downstream end of the supply path 22 for the cleaning liquid. This directional switching valve 11A is supplied with pilot air from any one of the three air ports 13A, so that the pressure feed path 19A of the main agent A communicates with the flow meter 12A, and the cleaning liquid supply path 22 is connected to the flow meter 12A. The state is switched to three modes: a state in which communication is performed, and a state in which the pressure path 19A and the flow meter 12A are disconnected and the supply path 22 and the flow meter 12A are disconnected.

  A discharge pipe 14A made of a highly rigid pipe having no flexibility is connected to the discharge port of the flow meter 12A, and a manual three-way valve 26A for drain is connected to the middle of the discharge pipe 14A. At the same time, the inlet of the check valve 27A is connected to the downstream end of the discharge pipe 14A. Furthermore, the upstream end of the flexible hose 15A is connected to the outlet of the check valve 27A. The check valve 27A allows the flow of the liquid agent (main agent A) from the discharge pipe 14A side (flow meter 12A side) to the hose 15A side, but restricts the flow from the hose 15A side to the discharge pipe 14A side. It has become.

  The downstream end of the hose 15A can be arbitrarily switched between a communication state in which the inside of the hose 15A and the mixer 28 are communicated with each other and a shut-off state in which the communication between the inside of the hose 15A and the mixer 28 is blocked. A directional control valve 30A as a switching means is connected. The direction control valve 30 </ b> A is attached so as to move integrally with the mixer 28 and the coating gun 29.

  The direction control valve 30A includes four inlets and one outlet, and the downstream end of the hose 15A is connected to one of the four inlets. The other three inlets are connected to the downstream end of the cleaning liquid supply path 22, the downstream end of the main agent B hose 15 </ b> B described later, and the downstream end of the air hose 25 described above. . The directional control valve 30A has a state in which any one of the four inlets communicates with the outlet by pilot air pumped from one of the four air ports 31A, and between all the inlets and outlets. It is possible to arbitrarily switch between the state where the power is shut off.

  The inlet of the mixer 28 is connected to the outlet of the direction control valve 30A. The mixer 28 has a blur mixer 28a and a static mixer 28b arranged in order, and mixes the main agent A or B and the curing agent a or b which are alternately flown through the direction control valve 30A. A coating gun 29 is connected to the outlet of the mixer 28.

  Similarly to the main agent A, the upstream end of a pressure feed path 19B in which a diaphragm pump 17B and a pressure control valve 18B are provided is connected to the other tank 16B for the main agent B, and the downstream end of the pressure feed path 19B is connected to the other tank 16B. Is connected to the quantitative supply means 10B. Since the quantitative supply means 10B for the main agent B has the same configuration as the fixed supply means 10A for the main agent A, description thereof is omitted, and A is replaced with B for reference numerals. Similarly to the main agent A, a discharge pipe 14B, a check valve 27B, and a flexible hose 15B are connected to the fixed amount supply means 10B for the main agent B, and the downstream end of the hose 15B is used for the main agent A described above. Connected to the inlet of the directional control valve 30A.

  Next, means for supplying the curing agents a and b will be described. One curing agent a is stored in a nitrogen-sealed tank 16a, and in the same way as the main agent A, the tank 16a has a pressure feed path 19a in which a diaphragm pump 17a and a pressure control valve 18a are interposed. The upstream end is connected, and the fixed amount supply means 10a is connected to the downstream end of the pressure feeding path 19a. Since the fixed quantity supply means 10a for the curing agent a has the same configuration as the fixed quantity supply means 10A for the main agent A, the description thereof is omitted, and the reference numeral A is replaced with a. Similarly to the main agent A, a discharge pipe 14a, a check valve 27a, and a flexible hose 15a are connected to the fixed amount supply means 10a for the curing agent a, and the downstream end of the hose 15a is connected to the direction control valve 30a. It is connected. Since the directional control valve 30a for the curing agent a has the same configuration as the directional control valve 30A for the main agent A and the main agent B, the description thereof is omitted, and the reference numeral A is replaced with a. The outlet of the directional control valve 30a is connected to the inlet of the mixer 28, which is common to the main agent A and the main agent B.

  The other tank 16b for the curing agent b is connected to the upstream end of the pressure feeding path 19b in which a diaphragm pump 17b and a pressure control valve 18b are provided in the middle, similarly to the curing agent a, and downstream of the pressure feeding path 19b. A fixed amount supply means 10b is connected to the end. Since the fixed quantity supply means 10b for the hardener b has the same configuration as the fixed quantity supply means 10a for the hardener a, the description thereof is omitted, and the reference numeral a is replaced with b. Similarly to the curing agent a, a discharge pipe 14b, a check valve 27b, and a flexible hose 15b are connected to the fixed amount supply means 10b for the curing agent b, and the downstream end of the hose 15b has the above-described curing. It is connected to the inlet of the directional control valve 30a for the agent a.

  As described above, two directional control valves 30A and 30a for the main agents A and B and the curing agents a and b are connected in a branched form from the mixer 28, and each directional control valve 30A and 30a is connected to each of the directional control valves 30A and 30a. Therefore, the hoses 15A, 15B, 15a, and 15b serving as supply paths for the different types of main agents A and B or curing agents a and b are connected in a branched form. A cleaning liquid supply path 22 is connected to each of the direction control valves 30A and 30a.

  Next, the operation of this embodiment will be described. When the main agent A and the curing agent a are mixed and supplied to the coating gun 29, the diaphragm pumps 17A, 17B, 17a, 17b, and 21 are controlled by supplying pressurized air from the air pressure supply source 24 to the air hoses 25. Drive. In addition, all the directional control valves 11A, 11B, 11a, and 11b are closed so that any liquid agent does not flow to the flow meters 12A, 12B, 12a, and 12b, and all the directional control valves 30A, About 30a, it is set as a valve closing state so that neither liquid may distribute | circulate to the mixer 28 side.

  In this state, first, the direction switching valve 11A for the main agent A is switched to a state in which the pressure feeding path 19A for the main agent A communicates with the flow meter 12A, and the main agent A is discharged to the hose 15A side by a predetermined flow rate. The discharged main agent A passes through the discharge pipe 14A and the check valve 27A in order and flows into the hose 15A. However, the discharge pipe 14A has high rigidity and does not deform and expand, so that it flows into the hose 15A. The amount is the same as the flow rate measured by the flow meter 12A. Further, the check valve 27A prevents the main agent A once flowing into the hose 15A from flowing back to the flow meter 12A (inside the discharge pipe 14A).

  Further, while the main agent A is being discharged from the flow meter 12A into the hose 15A as described above, the direction control valve 30A for the main agent A is in a state in which the hose 15A for the main agent A and the mixer 28 are in communication. It has been switched. Therefore, the main agent A that has flowed into the hose 15A can smoothly flow to the mixer 28 side, and the hose 15A is not deformed by the pressure of the main agent A, and the main agent A is the flowmeter 12A. Only the measured predetermined flow rate (the flow rate discharged from the flow meter 12A) passes through the direction control valve 30A and is supplied to the mixer 28. At this time, since the directional control valve 30a for the curing agent a is in a closed state, the liquid mixture in the mixer 28 and the main agent A that has passed through the directional control valve 30A are within the directional control valve 30a for the curing agent a. Will not flow into.

  When the main agent A having a predetermined flow rate is supplied to the mixer 28 as described above, the direction switching valve 11A for the main agent A is switched to the closed state, and the flow of the main agent A to the flow meter 12A side is stopped. The direction control valve 30A for the main agent A is also closed, and the flow of the liquid agent (main agent A) between the hose 15A and the mixer 28 is prevented.

  Next, the direction switching valve 11a for the curing agent a is switched to a state in which the pressure feeding path 19a for the curing agent a and the flow meter 12a are communicated, and the curing agent a is discharged to the hose 15a side by a predetermined flow rate. The discharged curing agent a passes through the discharge pipe 14a and the check valve 27a in order and flows into the hose 15a. However, since the discharge pipe 14a has high rigidity and does not deform and expand, it enters the hose 15a. Inflow amount is the same as the flow rate measured by the flow meter 12a. Further, the check valve 27a prevents the hardener a once flowing into the hose 15a from flowing back to the flow meter 12a side (inside the discharge pipe 14a).

  Further, while the curing agent a is being discharged from the flow meter 12a into the hose 15a, the direction control valve 30a for the curing agent a is switched to a state in which the hose 15a for the curing agent a and the mixer 28 are in communication. It has been. Therefore, the curing agent a flowing into the hose 15a can smoothly flow to the mixer 28 side, and the hose 15a is not deformed by the pressure of the curing agent A, and the curing agent a has a flow rate. A predetermined flow rate (the flow rate discharged from the flow meter 12a) measured by the meter 12a passes through the direction control valve 30a and is supplied to the mixer 28.

  When the curing agent a having a predetermined flow rate is supplied to the mixer 28 as described above, the direction switching valve 11a for the curing agent a is switched to the closed state, and the flow of the curing agent a to the flow meter 12a is stopped. At the same time, the direction control valve 30a for the hardener a is also closed, and the flow of the liquid agent (hardener a) between the hose 15a and the mixer 28 is prevented.

  The step of supplying the main agent A to the mixer 28 at a predetermined flow rate and the step of supplying the curing agent a to the mixer 28 at a predetermined flow rate are alternately repeated, whereby the main agent A and the curing agent are mixed in the mixer 28. a is mixed into a paint, and the paint is supplied from the mixer 28 to the coating gun 29.

  In the present embodiment, mixing of the main agent A and the curing agent b, mixing of the main agent B and the curing agent b, and mixing of the main agent B and the curing agent a are also possible. Switching valve 11A, 11B, 11a, 11b and direction control valve 30A, 30a are switched.

  Further, the supply paths (hose 15A, 15B) of the two types of main agents A and B merge at the direction control valve 30A, and the supply paths (hose 15a, 15b) of the two types of curing agents a and b also serve as the direction control valve 30A. It is supposed to join at. Therefore, when changing the types of the main agents A and B or the curing agents a and b, it is only necessary to clean only the downstream side (the coating gun 29 side) of the direction control valves 30A and 30a. For example, when the types of the main agents A and B are switched, the direction control valves 30A for the main agents A and B are switched to a state where the cleaning liquid supply path 22 and the mixer 28 communicate with each other. What is necessary is just to distribute | circulate in the mixer 28 and the coating gun 29. FIG. Since the cleaning liquid supply path 22 is also connected to the direction switching valve 11A, the direction switching valve 11A, the discharge pipe 14A, and the hose 15A can be cleaned.

  As described above, the coating apparatus according to the present embodiment includes the four fixed supply units 10A, 10B, 10a, and 10b that discharge the main agents A and B and the curing agents a and b at predetermined flow rates, and the four fixed supply units 10A and 10B. , 10a, 10b, four flexible hoses 15A, 15B, 15a, 15b connected to the discharge port side, and two quantitative supply means 10A, through these four hoses 15A, 15B, 15a, 15b, 10B, 10a, 10b are provided with a mixer 28 that mixes the main agent A or B and the curing agent a or b that are alternately pumped and supplies them to the coating gun 29. The hose 15A, 15B, 15a , 15b between the downstream end of the mixer 15 and the mixer 28, the communication state in which the hose 15A, 15B, 15a, 15b communicates with the mixer 28, and the hose 15A, 15B, 15a, 15b. Any of the directional control valve 30A switchable as possible and have been switching means to between the cut-off state in which communication between the machine 28 has a configuration in which a 30a. Therefore, when a predetermined amount of the main agent A or B is sent to the mixer 28 through the hose 15A or 15B, the direction control valve 30A is switched to the communication state, and the main agent A is provided between the hose 15A or 15B and the mixer 28. Alternatively, the flow rate of the main agent A or B fed into the mixer 28 is avoided by allowing the hose 15A or 15B to expand in diameter due to the discharge pressure of the main agent A or B by allowing the B to flow smoothly. Is less than the discharge amount from the quantitative supply means 10A or 10B. Similarly, with respect to the curing agents a and b, the diameter of the hose 15a or 15b is prevented from expanding due to the discharge pressure of the curing agent a or b, and the flow rate of the curing agent a or b fed into the mixer 28 is quantitatively supplied. It is avoided that the discharge amount from the means 10a or 10b falls below. Thereby, main agent A or B and hardening | curing agent a or b can be mixed reliably by a predetermined | prescribed ratio. In addition, after main agent A, B or hardening | curing agent a, b of predetermined flow volume is sent into the mixer 28, it switches hose 15A, 15B, 15a from the mixer 28 by switching the direction control valve 30A or 30a to the interruption | blocking state. , 15b is prevented from flowing back.

  Further, the downstream ends of the discharge pipes 14A, 14B, 14a, 14b and the hoses 15A, 15B, 15a, 15b connected to the discharge ports of the direction switching valves 11A, 11B, 11a, 11b of the quantitative supply means 10A, 10B, 10a, 10b. Since check valves 27A, 27B, 27a, and 27b are provided between the upstream ends of the hoses 15A, 15B, 15a, and 15b, the main agents A and B and the curing agents a and b that are once pumped into the hoses 15A, 15B, 15a, and 15b are provided. Backflow to the discharge pipes 14A, 14b, 14a, 14b side of the fixed amount supply means 10A, 10B, 10a, 10b is prevented.

  Moreover, between the communication state which makes the inside of hose 15A, 15B, 15a, 15b and the mixer 28 communicate, and the interruption | blocking state which interrupts | blocks the communication between the inside of hose 15A, 15B, 15a, 15b and the mixer 28 The direction control valves 30A, 30a having two inlets connected to the hoses 15A, 15B, 15a, 15b and one outlet connected to the mixer 28 are provided as switching means that can arbitrarily switch between the two. And two directional hoses 15A, 15B, 15a and 15b are connected to the direction control valves 30A and 30a, respectively. Thereby, two main agents A and B or curing agents a and b can be supplied to the mixer 28 by one directional control valve 30A and 30a.

  In addition, a supply path 22 as a cleaning liquid supply means 23 for supplying the cleaning liquid is connected to the inlets of the direction control valves 30A and 30a. That is, the cleaning target is not the entire distribution path of the main agents A and B or the curing agents a and b, but the flow paths of the main agents A and B (hoses 15A and 15B) and the flow paths of the curing agents a and b (hose 15a, 15b) is only downstream of the inlets of the direction control valves 30A and 30a to which the flow is combined, so that the amount of the main agents A and B or the curing agents a and b discarded along with the cleaning and the amount of the cleaning liquid are reduced. Can be suppressed.

<Other embodiments>
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) The switching means may be an on-off valve that includes one inflow port and one outflow port and switches between two modes of a valve open state and a valve closed state. When a plurality of main agents or curing agents are used as in the above-described embodiment, an on-off valve may be provided for each type (each hose).

  (2) The types of liquid agents to be mixed are not limited to the main agent and the curing agent, and may be other types of liquid agents.

  (3) The number of types of liquid agents to be mixed is not limited to two, and three or more types of liquid agents may be sequentially mixed.

  (4) In the above-described embodiment, two types of the main agent and the curing agent are provided, but at least one of the main agent and the curing agent may be only one type or three or more types.

  (5) In the above embodiment, the main agent side switching means (direction control valve) and the hardener side switching means (direction control valve) are provided separately, but the main agent side hose and the hardener side hose are provided as one. You may connect to a switching means (direction control valve).

  (6) It is good also as a structure which does not provide a check valve between the fixed supply means and the upstream end of the hose. In this case, backflow from the hose side to the quantitative supply means side can be prevented by an on-off valve connected to the discharge port of the quantitative supply means.

The circuit diagram showing the supply route of the liquid agent in the coating apparatus of this embodiment

Explanation of symbols

A ... Main agent (liquid)
B ... Main agent (liquid)
a: Curing agent (liquid)
b ... Hardener (Liquid)
10A, 10B, 10a, 10b ... fixed quantity supply means 15A, 15B, 15a, 15b ... hose 23 ... cleaning liquid supply means 27, 27B, 27a, 27b ... check valve 28 ... mixer 29 ... coating gun 30A, 30a ... direction control Valve (switching means)

Claims (4)

A plurality of quantitative supply means for discharging the liquid agent at a predetermined flow rate, a plurality of flexible hoses connected to discharge ports of the plurality of quantitative supply means, and a plurality of quantitative supply means through the plurality of hoses alternately A mixing device comprising a mixer for mixing the liquids of the plurality of types fed in sequence or sequentially and supplying the mixture to a coating gun,
Between the downstream end of the hose and the mixer, between a communication state in which the inside of the hose and the mixer are in communication and a blocking state in which the communication between the inside of the hose and the mixer is cut off. A coating device characterized in that it is provided with switching means that can be arbitrarily switched in the above. 2. A check valve is provided between the quantitative supply means and the upstream end of the hose, which allows only a liquid agent to pass from the quantitative supply means side to the hose side. The coating equipment described. 2. The directional control valve according to claim 1, wherein the switching unit is a directional control valve having a plurality of inlets to which the hose can be connected and a single outlet connected to the mixer. 2. The coating apparatus according to 2. 4. The coating apparatus according to claim 3, wherein a cleaning liquid supply means for supplying a cleaning liquid is connected to the inflow port of the direction control valve.

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