JP2010131563A - Apparatus for supplying mixed coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a cost and downsize equipment even when using a highly viscous base resin or a curing agent. <P>SOLUTION: A pressurizing device 20, which pressurizes a curing agent during inflow of the curing agent (a liquid agent) in a supplying path 11B exclusively for the curing agent use to a common supplying path 18 is halted, is connected to a position more downstream than a pressure feeding source 12B for the curing agent in the supplying path 11B exclusively for the curing agent use. As the pressurizing device 20 is provided at the position more downstream than the pressure feeding source 12B for the curing agent in the supplying path 11B exclusively for the curing agent use, the curing agent flows in a state of high pressure only at a side more downstream than the pressurizing device 20 to dispense with a high pressure measure at a side more upstream than the pressurizing device 20. It is possible to reduce a cost and downsize equipment at that extent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mixed paint supply apparatus.

Patent Document 1 discloses an apparatus for supplying a paint obtained by mixing a main agent and a curing agent. This device has a structure in which a main agent supply path and a curing agent supply path are connected to the upstream end of the common supply path, and a paint gun is connected to the downstream end of the common supply path. Are alternately added, and the two liquid agents are mixed while passing through the common supply path to form a mixed paint.
JP 2007-144286 A

  Various types of main agents and curing agents are used depending on the application, but some of the liquid agents have very high viscosity. When using such a high viscosity liquid agent, a dedicated supply channel is used. It is necessary to pump the liquid agent at a high pressure by providing a large-sized pump with a high pressure ratio to the pumping source provided at the upstream end of the liquid.

  However, when a pressure supply source for pumping the liquid agent at such a high pressure is provided at the upstream end of the dedicated supply path, it can withstand the high-pressure liquid agent over the entire region of the flow path of the liquid agent from the pressure supply source to the coating gun. It is necessary to take high pressure measures such as replacing the pipe with a rigid pipe (for example, a hose reinforced with a stainless steel pipe or a wire blade). However, such high-pressure measures not only increase the cost, but also increase the overall equipment.

  The present invention has been completed based on the above-described circumstances, and is a case where a high viscosity main agent or curing agent is used in an apparatus for supplying a mixed paint obtained by mixing a main agent and a curing agent. The objective is to reduce costs and downsize equipment.

  As means for achieving the above object, the invention of claim 1 is directed to a main agent-dedicated supply path in which a main agent pressure feed source is provided at the upstream end, and a hardener only in which a hardener pressure feed source is provided in the upstream end. A supply path, and a common supply path connected to the main agent-dedicated supply path and the curing agent-dedicated supply path at an upstream end, and the main agent and the curing agent alternately flowing into the upstream end of the shared supply path are supplied to the common supply path. A mixed paint supply device configured to supply a mixed paint obtained by mixing in a process of passing through a path to a coating gun, wherein the main agent exclusive supply path and the curing agent exclusive supply path At least one of the dedicated supply passages is connected to a position downstream of the pumping source, and the liquid agent is added while the liquid agent in the dedicated supply passage is suspended from flowing into the shared supply passage. The feature is that there is a pressurizing device to press To.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pressurizing device is provided in the dedicated supply path and faces the storage chamber in which the backflow to the upstream side is restricted, and the storage chamber. A movable member that is provided and can be displaced so as to increase or decrease the volume of the storage chamber; and a drive unit that drives the movable member in a direction in which the volume of the storage chamber is increased to store the liquid agent in the storage chamber; It is characterized in that the movable member is provided with a pressurizing means for applying a pressure in a direction to reduce the volume of the storage chamber.

  According to a third aspect of the present invention, in the second aspect, the pressurizing device includes a piston attached to the movable member so as to be integrally displaced, and a cylinder partitioned by the piston into two pressure chambers. The drive means includes the piston, the cylinder, and a drive pressurized air supply source for supplying pressurized air to one of the two pressure chambers. The pressurizing means includes the piston, the cylinder, and a pressurized air supply source for pressurization that supplies pressurized air to the other pressure chamber of the two pressure chambers. It is characterized by its construction.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the pressurizing device includes a detecting unit that detects that the volume of the storage chamber is maximized within the increase / decrease range. It has a characteristic where it exists.

<Invention of Claim 1>
While the liquid agent in the dedicated supply path on the side where the pressurizing apparatus is provided is stopped from flowing into the common supply path, the liquid agent is pressurized by the pressurizing apparatus. Thereafter, the pressurized liquid agent flows into the common supply path at a high pressure. According to the present invention, since the liquid agent flows in a high-pressure state only on the downstream side of the pressurizing device, no high-pressure countermeasure is required on the upstream side of the pressurizing device. It is possible to reduce the size.

<Invention of Claim 2>
While the liquid agent in the dedicated supply path on the side where the pressurizing device is provided is suspended from flowing into the common supply path, the movable member is displaced in the direction of increasing the volume of the storage chamber by the driving means. The liquid agent is stored in the storage chamber. Then, the liquid agent in the storage chamber is pressurized by applying a pressure in the direction of decreasing the volume of the storage chamber to the movable member by the pressurizing means.

<Invention of Claim 3>
Since the driving means and the pressurizing means share the piston and the cylinder, the number of parts can be reduced as compared with the case where these two means are all constituted by dedicated members.

<Invention of Claim 4>
Since the detection means for detecting that the volume of the storage chamber is maximized within the increase / decrease range is provided, based on the detection result of the detection means, the amount of the liquid medicine stored in the storage chamber has reached the normal amount Whether or not can be detected. As a result, it is possible to reliably avoid a situation where the amount of the liquid agent fed from the pressurizer to the common supply path is less than the normal amount, and the main agent and the curing agent are mixed at an appropriate mixing ratio. High quality mixed paint can be obtained.

<Embodiment 1>
Hereinafter, a first embodiment in which a mixed paint supply apparatus of the present invention is embodied will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the supply device applies a coating paint obtained by mixing a mixed paint obtained by mixing a main agent having a relatively low viscosity and a curing agent having a higher viscosity than the main agent (a liquid agent which is a constituent of the present invention). 10, the main agent exclusive supply path 11A, the curing agent exclusive supply path 11B, the common supply path 18 and the pressurizing device 20 are provided.

  A main agent pressure feed source 12A is connected to the upstream end of the main agent exclusive supply path 11A. The main agent pressure feed source 12A includes a main agent tank 13A in which the main agent is stored, and a main agent pump 14A that sucks up the main agent in the main agent tank 13A and pumps the main agent at a predetermined pressure downstream. The pumping capacity of the main agent pump 14A is such that when the main agent is pumped to the coating gun 10 through the main agent-dedicated supply path 11A and the common supply path 18, the pressure and flow rate necessary for satisfactory coating can be secured. Has been.

  A main agent on-off valve 15A that is switched between a valve open state that allows the flow of the main agent and a valve closed state that restricts the flow of the main agent is provided at a position near the downstream end of the main agent exclusive supply path 11A. Further, a main agent flow meter 16A for measuring the flow rate of the main agent is provided at a position downstream of the main agent open / close valve 15A in the main agent exclusive supply passage 11A, and the main agent flow meter 16A in the main agent exclusive supply passage 11A. Further, a main agent check valve 17A for restricting the backflow to the upstream side is provided at a position further downstream than the main valve.

  A curing agent pumping source 12B is connected to the upstream end of the curing agent dedicated supply path 11B. The curing agent pumping source 12B includes a curing agent tank 13B in which the curing agent is stored, and a curing agent pump 14B that sucks the curing agent in the curing agent tank 13B and pumps the curing agent downstream with a predetermined pressure. Configured. A hardener opening / closing valve 15B that is switched between a valve-opening state that allows the flow of the hardener and a valve-closed state that restricts the flow of the main agent is provided at a position near the downstream end of the hardener-dedicated supply path 11B. ing. Further, a curing agent flow meter 16B for measuring the flow rate of the curing agent is provided at a position downstream of the curing agent on-off valve 15B in the curing agent dedicated supply path 11B. At a position downstream of the curing agent flow meter 16B, there is provided a curing agent check valve 17B for restricting the backward flow to the upstream side.

  The downstream end of the main agent exclusive supply path 11 </ b> A and the downstream end of the curing agent exclusive supply path 11 </ b> B are connected to the upstream end of the common supply path 18. The coating gun 10 is connected to the downstream end of the common supply path 18. A mixer 19 is provided in the middle of the common supply path 18. The mixer 19 has a function of stirring and mixing the main agent and the curing agent that alternately flow into the common supply path 18.

  The viscosity of the curing agent is higher than that of the main agent, but the pumping capacity of the curing agent pump 14B is the same as that of the main agent pump 14A. Therefore, there is a concern that when a curing agent having a viscosity higher than that of the main agent is pumped only by the curing agent pump 14B, a predetermined flow rate cannot be obtained. Therefore, a pressurizing device 20 for pressurizing the hardener is provided in the hardener-dedicated supply path 11B as means for pumping the hardener at a predetermined flow rate.

  As shown in FIG. 2, the pressurizing device 20 includes an apparatus main body 21, a driving pressurized air supply source 30, and a pressurizing pressurized air supply source 31. The apparatus main body 21 is connected to a position downstream of the curing agent pumping source 12B and upstream of the curing agent on-off valve 15B in the flow path of the curing agent dedicated supply path 11B. The apparatus main body 21 has a storage chamber 22 formed therein, and an inflow hole 23 and an outflow hole 24 communicating with the storage chamber 22. The inflow hole 23 is connected to the downstream end of the flow path on the upstream side of the apparatus main body 21 of the curing agent dedicated supply path 11B, and the outflow hole 24 is more than the apparatus main body 21 of the curing agent dedicated supply path 11B. The upstream end of the downstream flow path is connected, and the curing agent pumped from the curing agent pumping source 12 </ b> B passes through the storage chamber 22 and is supplied to the common supply path 18. The inflow hole 23 allows the inflow of the hardener from the upstream side (the hardener pressure feed source 12B side) into the storage chamber 22, but prevents the hardener in the storage chamber 22 from flowing back to the upstream side. A check valve 25 for pressurization to be regulated is provided.

  A cylinder 26 is formed in the apparatus main body 21, and a piston 27 is slidably accommodated in the cylinder 26. The inside of the cylinder 26 is partitioned into a driving pressure chamber 28 and a pressurizing pressure chamber 29 by a piston 27. Further, a driving pressurized air supply source 30 is connected to the cylinder 26 so as to communicate with the driving pressure chamber 28, and a pressurized pressurized air supply source 31 so as to communicate with the pressurizing pressure chamber 29. Is connected. As a result, a driving operation for supplying pressurized air into the driving pressure chamber 28 while discharging air in the pressurizing pressure chamber 29, and an inside of the pressurizing pressure chamber 29 while discharging air into the driving pressure chamber 28 are performed. The pressurizing operation for supplying the pressurized air to each other is alternately performed.

  A guide hole 32 having a shape penetrating from the pressurizing pressure chamber 29 to the storage chamber 22 is formed in the apparatus main body 21, and a plunger 33 (a movable member which is a component of the present invention) is hermetically sealed in the guide hole 32. The plunger 33 is penetrated so as to reciprocate in the axial direction. The proximal end portion of the plunger 33 is fixed so as to move integrally with the piston 27, and the distal end portion of the plunger 33 projects into the storage chamber 22. When the plunger 33 moves, the protruding volume into the storage chamber 22 fluctuates, so that the volume in the storage chamber 22 increases or decreases.

  In addition, since the pressure receiving area of the piston 27 facing the pressure chambers 28 and 29 is set to be considerably larger than the area of the tip surface 33A perpendicular to the moving direction of the plunger 33, the tip of the plunger 33 in the storage chamber 22 is set. The pressure (including negative pressure) acting on the curing agent from the surface 33 </ b> A is greater than the pressure applied to the piston 27. Note that the axis of the plunger 33 is disposed substantially coaxially with the inflow hole 23, and the distal end surface 33 </ b> A of the plunger 33 faces the pressurizing check valve 25 so as to approach and separate.

  The above-described piston 27, cylinder 26, and driving pressurized air supply source 30 constitute a driving means 34 for driving the plunger 33 in a direction in which the volume of the storage chamber 22 is increased and the liquid agent is stored in the storage chamber 22. To do. The piston 27, the cylinder 26, and the pressurized pressurized air supply source 31 constitute a pressurizing unit 35 that applies a pressure in a direction that reduces the volume of the storage chamber 22 to the plunger 33.

  A first stopper 36 and a second stopper 37 are formed on the inner wall of the cylinder 26. The first stopper 36 faces the pressurizing pressure chamber 29 and faces the pressure receiving surface on the opposite side of the plunger 33 from the two pressure receiving surfaces of the piston 27. On the other hand, the second stopper 37 faces the driving pressure chamber 28 and faces the pressure receiving surface of the piston 27 on the plunger 33 side. Further, each of the pressurizing pressure chamber 29 and the driving pressure chamber 28 is provided with a buffer spring 38, and immediately before the piston 27 contacts the first stopper 36, the speed of the piston 27 is increased by the buffer spring 38. The shock to the first stopper 36 is weakened by being weakened, and the speed of the piston 27 is weakened by the buffer spring 38 just before the piston 27 comes into contact with the second stopper 37, and the second stopper 37. The impact on is designed to be reduced.

  The first stopper 36 is provided with a reed switch 39 (detection means that is a constituent of the present invention). The reed switch 39 detects the position of the piston 27 when the volume in the pressurizing pressure chamber 29 is minimized and the piston 27 contacts the first stopper 36. In a state where the piston 27 is in contact with the first stopper 36, the amount of protrusion of the plunger 33 into the storage chamber 22 is minimized, so that the volume of the storage chamber 22 is maximized. That is, the reed switch 39 detects that the volume in the storage chamber 22 is maximized.

  Next, the operation of this embodiment will be described. When painting, the operation of pumping the main agent in the main agent pumping source 12A and the operation of pumping the curing agent in the curing agent pumping source 12B are continuously performed, and the main agent on-off valve 15A and the curing agent The on-off valve 15B performs an opening / closing operation alternately every predetermined time. As shown in FIG. 3, by alternately opening and closing the both on-off valves 15A and 15B, the main agent charging step for flowing the main agent into the common supply path 18 and the curing agent charging step for flowing the hardener into the common supply path 18 are alternated. To be done. The main agent and the curing agent that alternately flow into the common supply path 18 are mixed in the process of flowing downstream in the common supply path 18 and are stirred when passing through the mixer 19 to become a mixed paint, The paint gun 10 is supplied and discharged from the paint gun 10 toward the object to be coated.

  In the alternating charging process of the main agent and the curing agent, the main agent charging process in which the main agent is charged (inflowed) into the common supply path 18, that is, the process in which the charging (inflow) of the curing agent is stopped (inflow) is cured. The curing agent is pressurized by the pressurizing device 20 in the agent dedicated supply path 11B. When the hardener opening / closing valve 15B is switched to the closed state and the charging of the hardener is stopped, at the same time, the driving pressurized air supply source 30 is turned on, and the pressurized air enters the driving pressure chamber 28 from here. Is supplied, and the plunger 33 moves in a direction to increase the volume in the storage chamber 22. At this time, the inside of the pressurizing pressure chamber 29 is open to the atmosphere. Along with the movement of the plunger 33, the hardener in the region upstream of the pressurizer 20 in the hardener-dedicated supply path 11 </ b> B passes through the pressurization check valve 25 and flows into the storage chamber 22.

  When the volume of the storage chamber 22 becomes maximum and the piston 27 contacts the first stopper 36, the contact is detected by the reed switch 39 (in FIG. 3, the switch is switched from the OFF state to the ON state). By the detection signal from, the driving pressurized air supply source 30 is turned off, and the supply of pressurized air into the driving pressure chamber 28 is stopped. At this time, the storage amount of the curing agent in the storage chamber 22 is maximized. Then, the curing agent on-off valve 15B located on the downstream side of the storage chamber 22 is in a closed state, and the backflow to the upstream side is regulated by the pressurization check valve 25, whereby the inside of the storage chamber 22 The hardening agent stored in the storage chamber 22 and the hardening agent between the storage chamber 22 and the opening / closing valve 15B for the hardening agent are in a state in which the flow is restricted.

  Further, at the same time as the supply of pressurized air to the driving pressure chamber 28 is stopped, the pressurized pressurized air supply source 31 is switched from the OFF state to the ON state, and the supply of pressurized air into the pressurizing pressure chamber 29 is stopped. Start. The pressure of the supplied pressurized air acts on the piston 27 and the plunger 33, thereby storing a driving force in the direction of decreasing the volume in the storage chamber 22 in the plunger 33 and curing in the storage chamber 22. The curing agent between the agent and the storage chamber 22 and the curing agent on-off valve 15B is pressurized. While the pressurized air is supplied into the pressurizing pressure chamber 29, the inside of the driving pressure chamber 28 is opened to the atmosphere.

  When a predetermined amount of the main agent is introduced into the common supply path 18, the main agent on-off valve 15A is switched to the closed state, and at the same time, the curing agent on-off valve 15B is switched to the valve open state. However, the supply of pressurized air to the pressurizing pressure chamber 29 is continued. When the curing agent on-off valve 15B is opened, the piston 27 and the plunger 33 move in a direction to decrease the volume of the storage chamber 22, and the pressurized curing agent is pushed by the plunger 33 along with this movement. As a result, the pressure passes through the curing agent on-off valve 15B while being kept at a high pressure and is fed to the common supply path 18 by pressure.

  When it is detected by the curing agent flow meter 16B that a predetermined amount of the curing agent has been introduced into the common supply path 18, the curing agent on-off valve 15B is switched to the closed state, and at the same time, the main agent on-off valve 15A. Is opened and charging of the main agent into the common supply path 18 is performed. At the same time, as described above, the operation of storing the curing agent in the storage chamber 22 and then pressurizing the curing agent is repeated. As described above, the main agent and the curing agent are alternately charged into the common supply path 18.

  In the present embodiment, the pressurizing device 20 as a means for pressurizing and supplying the hardener with high viscosity is connected to a position downstream of the hardener pumping source 12B in the hardener dedicated supply path 11B. The curing agent only needs to flow on the downstream side of the pressurizing device 20 in a high pressure state. Therefore, on the upstream side of the pressurizing device 20, a high-pressure countermeasure such as replacement with a highly rigid pipe line (for example, a hose reinforced with a stainless steel pipe or a wire blade) so as to withstand a high-pressure hardener. Therefore, it is possible to reduce costs and downsize equipment. In addition, since it is not necessary to provide a large pump with a high pressure ratio in the curing agent pumping source 12B, it is possible to reduce costs and downsize equipment.

  Further, since the driving means 34 and the pressurizing means 35 share the piston 27 and the cylinder 26, the number of parts can be reduced as compared with the case where these two means are all constituted by dedicated members. It is out.

  In addition, since the reed switch 39 is provided as a detecting means for detecting that the volume of the storage chamber 22 is maximized within the increase / decrease range, the storage chamber 22 is stored in the storage chamber 22 based on the detection result of the reed switch 39. It is possible to detect whether or not the amount of the curing agent has reached a normal amount. Thereby, the situation that the quantity of the hardening | curing agent thrown into the common supply path 18 from the pressurization apparatus 20 is insufficient from a regular quantity can be avoided reliably, and the main ingredient and the hardening | curing agent are made into appropriate mixing ratio. High quality mixed paint can be obtained by mixing.

<Other embodiments>
The present invention is not limited to the embodiments 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.

  (1) In the above embodiment, the movable member is a plunger that moves in a non-contact state with the inner wall surface of the storage chamber. However, as the movable member, a piston that moves while sliding on the inner wall surface of the storage chamber, A diaphragm constituting a part of the inner wall of the chamber can be used.

  (2) In the above embodiment, high-pressure pressurized air is used as the driving force of the driving means. However, negative pressure by evacuation may be used as the driving force of the driving means.

  (3) In the above embodiment, fluid pressure (pneumatic pressure) is used as the drive source of the drive means. However, a motor can be used as the drive source of the drive means. In this case, the driving force of the motor may be moved by moving the movable member via a mechanical power transmission mechanism such as a rack and pinion.

  (4) In the above embodiment, high-pressure pressurized air is used as the driving force of the pressurizing unit. However, a negative pressure by evacuation may be used as the driving force of the pressurizing unit.

  (5) In the above embodiment, the driving means and the pressurizing means share the piston and the cylinder. However, the driving means and the pressurizing means do not include a common member, and are all configured by dedicated members. Also good.

  (6) In the above embodiment, the driving unit and the pressurizing unit are arranged in one end side of the movable member, but the driving unit is arranged on one end side of the movable member, and The pressurizing means may be arranged on the other end side of the movable member.

  (7) In the above embodiment, the check valve is used as a means for restricting the liquid agent in the storage chamber from flowing back to the upstream side, but an open / close valve may be used instead.

  (8) In the above embodiment, as means for controlling the inflow operation and the pause operation of the main agent and the curing agent with respect to the common supply path, the main agent-dedicated on-off valve provided in the main agent-dedicated supply path and the curing provided in the hardener-dedicated supply path Instead of this, the directional control valve having a plurality of inflow ports is provided at the upstream end of the common supply path, and the dedicated supply path is connected to each inflow port. Thus, the main agent and the curing agent may alternately flow into the common supply path.

  (9) In the above embodiment, the movement stroke of the movable member (plunger) is defined by the mechanical contact structure. However, the movement stroke of the movable member is determined by using a sensor that detects the position of the movable member. You may prescribe. In this case, if a plurality of sensors are arranged along the movement path of the movable member, the movement stroke of the movable member (that is, the amount of the liquid agent sucked into the storage chamber) can be appropriately changed.

  (10) In the above embodiment, only the volume of the storage chamber is detected to be the maximum within the increase / decrease range, but only the volume of the storage chamber is detected to be the minimum within the increase / decrease range. You may make it carry out, and you may make it detect that the volume of the storage chamber became the maximum and the minimum within the increase / decrease range.

  (11) In the above embodiment, since the viscosity of the curing agent is higher than that of the main agent, the pressure device is provided only in the supply channel for the curing agent, but the pressure device depends on the viscosity of the main agent and the curing agent. You may provide only in the main agent exclusive supply path, and may provide in both the main agent exclusive supply path and the hardening agent exclusive supply path.

  (12) In the above embodiment, since the main agent and the curing agent have different viscosities, only the liquid on the higher viscosity side is pumped at a high pressure using the pressurizing device. However, the pressurizing device of the present invention is the main agent. It can also be applied when both the curing agent and the curing agent have a relatively low viscosity. In this case, since the mixed paint can be pumped to the coating gun at a high pressure, an airless type coating gun can be used.

  (13) Examples of the mixed paint applicable to the present invention include a high-viscosity urethane paint for heavy anticorrosion and an aqueous two-component urethane paint.

  (14) In the above embodiment, only one main agent exclusive supply path is provided. However, the present invention can also be applied to the case where a plurality of main agent exclusive supply paths are connected to the color change valve.

  (15) In the above embodiment, only one curing agent-dedicated supply path is provided, but the present invention can also be applied to a case where a plurality of curing agent-dedicated supply paths are connected to the color change valve.

  (16) The pressurizing device according to the above embodiment has a storage chamber whose volume can be increased or decreased in the middle of the dedicated supply path, and after storing the liquid agent in the storage chamber in the step of stopping the flow of the liquid agent into the common supply path Although the stored liquid agent is pressurized, according to the present invention, the liquid agent may be pressurized without providing a storage chamber. That is, a piston that reciprocates in a state in which the dedicated supply path is partitioned into an upstream side and a downstream side is provided in the dedicated supply path, a check valve is provided in the piston, and pressure is applied to the piston, thereby providing a downstream side of the piston. It can be set as the structure which pressurizes this liquid agent. According to this configuration, in the step of flowing the liquid agent into the common supply path, the piston pushes the liquid agent to the common supply path side while pressurizing the liquid agent, and at the same time, the liquid agent is downstream downstream so as to follow the piston upstream of the piston. Further, in the subsequent inflow stoppage process, after returning the piston to the upstream side while opening the check valve, the liquid agent on the downstream side of the piston can be pressurized again.

Schematic diagram of Embodiment 1 Cross section of pressure device Time chart showing the operation of each member in the alternate charging process of main agent and curing agent

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Paint gun 11A ... Main agent exclusive supply path 11B ... Curing agent exclusive supply path 12A ... Main agent pressurization source 12B ... Hardener pressurization source 18 ... Common supply channel 20 ... Pressurization device 22 ... Reservoir 26 ... Cylinder 27 ... Piston 30 ... Driven pressurized air supply source 31 ... Pressurized pressurized air supply source 33 ... Plunger (movable member)
34 ... Driving means 35 ... Pressurizing means 39 ... Reed switch (detecting means)

Claims (4)

A main agent exclusive supply path provided with a main agent pumping source at the upstream end;
A dedicated supply path for the hardener provided with a pumping source of the hardener at the upstream end;
A common supply path connected to the main agent-dedicated supply path and the curing agent-dedicated supply path at the upstream end;
Mixed paint obtained by supplying mixed paint obtained by mixing the main agent and the curing agent alternately flowing into the upstream end of the shared supply path in the process of passing through the shared supply path to the coating gun A feeding device of
At least one of the main agent exclusive supply path and the curing agent exclusive supply path is connected to a position downstream of the pressure supply source, and the liquid agent in the exclusive supply path is supplied to the shared supply path. An apparatus for supplying mixed paint, characterized in that a pressurizing device is provided for pressurizing the liquid agent while the inflow of the liquid is stopped. The pressure device is
A storage chamber that is provided in the dedicated supply path and whose backflow to the upstream side is restricted;
A movable member provided to face the storage chamber and displaceable to increase or decrease the volume of the storage chamber;
Drive means for driving the movable member in a direction to increase the volume of the storage chamber and store the liquid agent in the storage chamber;
2. The mixed paint supply apparatus according to claim 1, further comprising a pressurizing unit that applies pressure in a direction to reduce the volume of the storage chamber to the movable member. The pressure device is
A piston attached to the movable member so as to be integrally displaced;
A cylinder partitioned into two pressure chambers by the piston,
The driving means includes the piston, the cylinder, and a driving pressurized air supply source that supplies pressurized air to one of the two pressure chambers,
The pressurizing means includes the piston, the cylinder, and a pressurized pressurized air supply source that supplies pressurized air to the other pressure chamber of the two pressure chambers. The mixed paint supply device according to claim 2.   The said pressurization apparatus is provided with the detection means which detects that the volume of the said storage chamber became the maximum in the increase / decrease range, Supply of the mixed coating material of Claim 2 or Claim 3 characterized by the above-mentioned. apparatus.

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