JP2011161413A - Liquid agent supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid agent supply device which supplies a plurality of liquid agents while introducing them alternately or successively, and besides, mixing the liquid agents at a proper mixing ratio. <P>SOLUTION: This liquid agent supply device comprises the following components: (1) two exclusive flow paths 25A and 25B connected with the upstream end 10P of a common flow path 10 into which a principal agent and a curing agent are alternately introduced, (2) a gear pump 28 (a displacement pump) installed in each exclusive flow path 25A and 25B, (3) liquid agent regulators 27A and 27B which control so that the primary side pressure of the exclusive flow paths 25A and 25B becomes the same in the respective exclusive flow paths 25A and 25B, and a control valve 13 (a pump control means) which controls the drive of the gear pump 28 so that the primary side pressure and the secondary side pressure becomes the same in accordance with the comparison results obtained by comparing the primary side pressure with the secondary side pressure of the common flow path 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid supply device for mixing and supplying a plurality of liquid agents.

  Patent Document 1 discloses an apparatus for supplying two liquid agents while simultaneously feeding them into a common flow path and mixing them. This apparatus includes two dedicated flow paths for supplying two liquid agents individually, a shared flow path connected to the downstream ends of the two dedicated flow paths, and a gear pump provided in each dedicated flow path. Since the pressures at the downstream ends of the two dedicated flow paths coincide with each other by the back pressure valve provided on the dedicated flow path side, mixing failure due to the pressure difference at the downstream ends of the two dedicated flow paths can be avoided. it can.

Japanese Utility Model Publication No. 5-67349

  The above apparatus exhibits a sufficient effect in a supply form in which two liquid agents are simultaneously charged into a common flow path. However, when this apparatus is applied to a supply configuration in which a plurality of liquid agents are alternately or sequentially added, a pressure difference is generated between the common channel and the dedicated channel, and the pressure difference varies with time. As a result, the amount of the liquid agent to be introduced becomes unstable, and there is a concern that an appropriate mixing ratio cannot be obtained.

  The present invention has been completed based on the above circumstances, and in an apparatus that supplies a plurality of liquid agents while alternately or sequentially charging and mixing them, a plurality of liquid agents can be mixed at an appropriate mixing ratio. The purpose is to.

  As means for achieving the above object, the invention of claim 1 is a liquid agent supply device for supplying a plurality of liquid agents alternately or sequentially into a common flow path and mixing them, wherein the common flow is provided. A plurality of dedicated flow paths connected to the upstream end of the channel and individually supplying the plurality of liquid agents; a plurality of positive displacement pumps individually provided in the plurality of dedicated flow paths; and a primary in the plurality of dedicated flow paths The liquid pressure regulator that controls the side pressure to be the same in all the dedicated flow paths, the primary pressure and the secondary pressure in the shared flow path are compared, and according to the comparison result, It is characterized in that it comprises pump control means for controlling the driving of the plurality of positive displacement pumps so that the primary side pressure and the secondary side pressure become the same pressure.

  According to a second aspect of the present invention, the pressure adjusting air supplied to the liquid regulator is supplied to the pump control means in order to compare the primary side pressure and the secondary side pressure. It is characterized in that a common air regulator is provided to bring the same pressure to the comparison air.

  According to a third aspect of the present invention, in the second aspect, an air motor is provided as pump driving means for shifting or stopping the positive displacement pump, and the pump control means includes the detection air and the secondary pump. The amount of drive air supplied to the air motor is controlled in accordance with the pressure difference from the side pressure, and the flow path of the drive air is used as an air supply source common to the pressure adjusting air and the comparison air. It is characterized by being connected.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the plurality of dedicated flow paths control a plurality of liquid agent charging operations and charging stop operations with respect to the shared flow paths. A plurality of on-off valves are provided, and the plurality of positive displacement pumps are driven in the same cycle by a common pump driving means, and the discharge amount per one cycle of the plural positive displacement pumps is , All the positive displacement pumps have the same amount.

  According to a fifth aspect of the present invention, in the pump according to the fourth aspect, the pump driving means is provided with a pump sensor that outputs a detection signal every time the positive displacement pump is driven for one cycle. It is characterized in that the input amounts of the plurality of liquid agents are individually controlled by opening and closing the plurality of on-off valves based on detection signals from the sensors.

  The invention of claim 6 is the one according to claim 4 or claim 5, wherein in the state where charging of the liquid agent from the dedicated channel to the common channel is stopped, It is characterized in that an annular flow path for circulating the liquid agent upstream from the positive displacement pump is provided.

  The invention according to claim 7 is the one according to any one of claims 1 to 6, wherein the shared flow path is located upstream of the pump control means and is introduced into the shared flow path. It is characterized in that a mixer for stirring the plurality of liquid agents is provided.

  The invention according to claim 8 is the liquid agent for detecting whether or not the liquid agent is flowing at a downstream position in the dedicated flow path in any one of claims 1 to 7. It is characterized in that the sensor for use is provided.

<Invention of Claim 1>
Even if the secondary pressure in the common flow path fluctuates, the pump control means controls the drive of the positive displacement pump, so that the primary pressure in the dedicated flow path and the secondary pressure in the common flow path are the same pressure. Become. Accordingly, an appropriate mixing ratio can be obtained without causing the amount of the liquid agent to be improperly fluctuated due to the pressure difference between the primary pressure and the secondary pressure.

<Invention of Claim 2>
The primary pressure corresponds to the pressure value of the pressure adjusting air, and the secondary pressure corresponds to the pressure value of the comparison air. Since the common air regulator is used as means for making the pressure adjusting air and the comparison air the same pressure, the pressure difference between the primary side pressure and the secondary side pressure can be minimized.

<Invention of Claim 3>
Since the air supply sources for the drive air, the pressure adjusting air, and the comparison air are made common, the structure of the entire apparatus can be simplified.

<Invention of Claim 4>
Since the discharge amount per cycle of a plurality of positive displacement pumps is the same for all positive displacement pumps, and the multiple positive displacement pumps are driven by a common pump drive means, The primary side pressure can be matched with high accuracy in all the dedicated flow paths.

<Invention of Claim 5>
Since the input amount of each liquid agent is proportional to the discharge cycle of the positive displacement pump, it is high by accurately controlling the input amount of the plurality of liquid agents by opening and closing the plurality of on-off valves based on the detection signal from the pump sensor. An accurate mixing ratio can be obtained, and the mixing ratio can be arbitrarily changed.

<Invention of Claim 6>
When the on-off valve is closed and charging to the common flow path is stopped, the liquid agent is circulated upstream from the positive displacement pump. Can be prevented from becoming an excessively high pressure.

<Invention of Claim 7>
Since the plurality of liquid agents put into the common flow path are agitated by the mixer and mixing proceeds, the viscosity of the mixed liquid agent when reaching the pump control means is stable even if the difference in viscosity between the plurality of liquid agents is large. . Thereby, the fluctuation | variation of the secondary side pressure resulting from the difference in a viscosity can be avoided.

<Invention of Claim 8>
By providing the liquid agent sensor, it is possible to detect an abnormality in the flow state of the liquid agent in the dedicated channel.

Configuration diagram of supply device of embodiment 1

<Embodiment 1>
A first embodiment embodying the present invention will be described below with reference to FIG. The liquid agent supply apparatus of the present embodiment is a two-component solution in which a main agent (a liquid agent that is a constituent element of the present invention) and a curing agent (a liquid agent that is a constituent element of the present invention) are alternately put into the common flow path 10 and mixed. The paint is supplied to the paint gun 11 as a paint. The configuration will be described below.

  In the common flow path 10, in order from the upstream side toward the downstream side, a first mixer 12 (mixer which is a constituent element of the present invention), a control valve 13 (pump control means which is a constituent element of the present invention), A coating gun 11 is connected to the downstream end of the common flow path 10. The first mixer 12 disposed on the upstream side of the control valve 13 is for sufficiently stirring and mixing the main agent and the curing agent alternately supplied to the common flow path 10 while passing through. Even when the viscosities greatly differ, the viscosity of the mixed liquid (two-component paint) of the main agent and the curing agent that has passed through the first mixer 12 is stabilized. Therefore, there is no possibility that the viscosity of the two-component paint flowing into the control valve 13 varies greatly. Note that the second mixer 14 disposed on the upstream side of the coating gun 11 is for further stirring the two-component paint that has passed through the control valve 13. The two-component paint is supplied to the coating gun 11.

  The control valve 13 compares the primary side pressure in the main agent dedicated flow channel 25A and the curing agent dedicated flow channel 25B, which will be described later, with the secondary pressure in the shared flow channel 10, and according to the comparison result, the primary side pressure This is for controlling the driving of a gear pump 28 (a positive displacement pump which is a constituent element of the present invention), which will be described later, so that the pressure and the secondary pressure are the same. The control valve 13 includes a movable pressure receiving member (diaphragm, piston, etc.) facing the common flow path 10, a valve body that moves integrally with the movable pressure receiving member, and comparison air connected to the downstream end of the comparison air inflow path 18. An inflow port 15, a drive air inflow port 16 connected to the downstream end of the drive air inflow passage 19, and a drive air outflow port 17 connected to the upstream end of the drive air outflow passage 20 are provided. The comparative air inlet 15 and the driving air inlet 16 are always open, and the driving air outlet 17 is opened and closed by a valve body.

  The upstream end of the comparison air inflow path 18 is connected to an air supply source 21. In the middle of the comparison air inflow passage 18, the pressure of the comparison air flowing in the comparison air inflow passage 18 and the pressure of the pressure adjustment air described later are kept constant, and the comparison air and the pressure adjustment air are at the same pressure. An air regulator 22 is provided to maintain the air pressure. The upstream end of the drive air inflow path 19 is directly connected to the air supply source 21 without going through the air regulator 22. The downstream end of the drive air outflow path 20 is connected to an air motor 23 for driving the gear pump 28. A motor regulator 24 for adjusting the amount of air discharged from the air motor 23 is connected to the air motor 23.

  The downstream end of the main agent dedicated flow channel 25 </ b> A and the downstream end of the hardener dedicated flow channel 25 </ b> B are connected to the upstream end of the shared flow channel 10. Therefore, the upstream end of the shared flow path 10 is a junction 10P of the main agent dedicated flow path 25A and the hardener dedicated flow path 25B. The upstream end of the main agent dedicated flow path 25A is connected to the main agent supply source 26A, and the upstream end of the hardener dedicated flow path 25B is connected to the curing agent supply source 26B.

  In the main agent dedicated flow passage 25A, the main agent regulator 27A (the liquid agent regulator which is a constituent of the present invention), the gear pump 28, and the main agent on-off valve 29A (the present invention) are arranged in order from the upstream side to the downstream side. An on-off valve which is a constituent), a main agent sensor 30A (a liquid agent sensor which is a constituent of the present invention), and a check valve 31 are provided. In the curing agent dedicated flow path 25B, in order from the upstream side to the downstream side, the curing agent regulator 27B (regulator for liquid agent which is a constituent of the present invention), the gear pump 28, and the opening / closing valve 29B for curing agent ( An on-off valve which is a constituent element of the present invention, a sensor 30B for a hardener (a liquid sensor which is a constituent element of the present invention), and a check valve 31 are provided.

  The main agent regulator 27A and the hardener regulator 27B are for the primary agent primary pressure on the downstream side of the main agent regulator 27A in the main agent exclusive flow path 25A and for the hardener in the hardener exclusive flow path 25B. This is for maintaining the primary pressure of the curing agent downstream of the regulator 27B at the same pressure. Further, the pressure in the main agent dedicated flow path 25A and the curing agent dedicated flow path 25B are not set to a pressure higher than the set primary pressure.

  The comparison air inflow path 18 is connected to an upstream end of a pressure regulating air inflow path 32 that is branched from a position downstream of the air regulator 22. The pressure adjusting air inflow passage 32 is bifurcated in the middle, and the downstream end of one of the branch passages is connected to the main agent regulator 27A, and the downstream end of the other branch passage is connected to the curing agent regulator 27B. Has been. As a result, pressure adjusting air having the same pressure as the comparison air supplied to the control valve 13 is supplied to the main agent regulator 27A and the hardener regulator 27B. Then, by supplying the pressure adjusting air, the pressure of the main agent in the main agent dedicated flow path 25A and the pressure of the curing agent in the hardener dedicated flow path 25B are adjusted to be the same pressure.

  The gear pump 28 of the main agent dedicated flow path 25A and the gear pump 28 of the hardener dedicated flow path 25B are both mechanically connected to the air motor 23 via the drive shaft 33, and drive air is supplied to the air motor 23. Then, both the main agent gear pump 28 and the hardener gear pump 28 are driven in the same cycle via the drive shaft 33. Further, the gear pump 28 for the main agent and the gear pump 28 for the curing agent have the same discharge amount per cycle. Therefore, the main agent gear pump 28 and the hardener gear pump 28 discharge the main agent and the hardener in the same amount at the same timing. The air motor 23 is provided with a pump sensor 34 that detects the number of rotations of the drive shaft 33 every cycle and outputs a detection signal (pulse signal).

  The main agent on-off valve 29A is referred to as a three-way valve having one liquid agent inlet and two liquid agent outlets, and one of the two liquid agent outlets is connected to the main agent dedicated flow path 25A. The upstream end of the annular flow path 35 is connected to the other liquid agent outlet. The downstream end of the annular flow path 35 is connected to the main agent regulator 27A. When opening / closing air is supplied to the main agent opening / closing valve 29A from a control device 36, which will be described later, the two liquid agent outlets open and close alternately, and the main agent opening / closing valve 29A uses the main agent discharged from the gear pump 28 exclusively for the main agent. An input state in which it flows out downstream from the flow path 25A and enters the common flow path 10, and a recirculation state in which the main agent discharged from the gear pump 28 is recirculated to the main agent regulator 27A without being input to the common flow path 10. Switch to

  Since the hardener on-off valve 29B has the same configuration as the main agent on-off valve 29A, detailed description thereof is omitted. When the opening / closing air is supplied from the control device 36 to the hardener opening / closing valve 29B, the two liquid agent outlets alternately open and close, and the hardener opening / closing valve 29B uses the hardener discharged from the gear pump 28 as the hardener. The flow-out state flows into the downstream side of the dedicated flow path 25B and flows into the shared flow path 10, and the hardener discharged from the gear pump 28 is not flowed into the shared flow path 10 and returned to the hardener regulator 27B. Switch to the reflux state

  The main agent sensor 30A is for detecting whether or not the main agent is flowing in the main agent dedicated flow path 25A, and a detection signal from the main agent sensor 30A is input to the control device 36. The curing agent sensor 30B is for detecting whether or not the curing agent is flowing in the curing agent dedicated flow path 25B, and the detection signal from the curing agent sensor 30B is the main agent sensor 30A. Like the detection signal from, the signal is input to the control device 36. Further, the control device 36 receives a detection signal (pulse signal) from the pump sensor 34 for detecting the rotational speed of the drive shaft 33 of the air motor 23.

  In the control device 36, a setting value for the main agent corresponding to the flow rate of the main agent per time for the common flow channel 10 and a setting value for the hardener corresponding to the flow rate of the hardener per time for the common flow channel 10. Is stored, and the ratio of the setting value for the main agent and the setting value for the curing agent is the same as the mixing ratio of the main agent and the curing agent. These set values are compared with the number of detection signals (pulse signals) from the pump sensor 34, and control is performed based on the comparison results and detection signals from the main agent sensor 30A and the hardener sensor 30B. From the device 36, a control signal for switching between the charging state and the recirculation state is output to the main agent on-off valve 29A, and a control signal for switching between the charging state and the recirculation state for the hardener opening / closing valve 29B. Is output.

  Next, the operation of this embodiment will be described. In a state in which the two-component paint is normally ejected from the coating gun 11, the main agent on-off valve 29A is turned on by the control signal from the control device 36, and the hardener on-off valve 29B is in the reflux state. Thus, the main agent charging process in which the main agent is introduced into the common flow path 10, and the main agent on-off valve 29 A is in a reflux state and the hardener on-off valve 29 B is in the input state, whereby the hardener is supplied to the common flow path 10. The curing agent charging process to be input is repeated alternately.

  In the main agent charging process, the number of pulses of the detection signal from the pump sensor 34 is compared with the main agent set value in the control device 36. When the number of input pulses reaches the main agent set value, the main agent on-off valve 29A is turned on. At the same time when the charging state is switched to the circulating state, the curing agent on-off valve 29B is switched from the circulating state to the charging state, and the charging operation becomes the curing agent charging process. In the curing agent charging process, the number of pulses of the detection signal from the pump sensor 34 is compared with the setting value for the curing agent, and when the number of pulses reaches the setting value for the curing agent, the on / off valve 29B for the curing agent is recirculated from the charged state. At the same time as switching to the state, the main agent on-off valve is switched from the reflux state to the charging state, and the charging operation becomes the main agent charging process. By alternately performing the above operations, the main agent and the curing agent are introduced into the common flow path 10 at an appropriate mixing ratio, and the two-component paint is supplied to the coating gun 11.

  While the two-component paint is supplied from the coating gun 11, the secondary pressure in the common flow path 10 is slightly smaller than the pressure of the comparison air supplied to the control valve 13. The drive air outlet 17 is opened, and the drive air pumped from the air supply source 21 through the drive air inflow passage 19 to the control valve 13 continues to be supplied to the air motor 23 through the drive air outflow passage 20. The two gear pumps 28 for the main agent and the hardener continue to drive stably.

  In a state where the main agent and the curing agent are stably fed into the common flow path 10 at an appropriate mixing ratio, the pressure value of the secondary side pressure in the common flow path 10 is a value corresponding to the pressure of the comparison air. Yes, it is the same value as the primary pressure regulated by the main agent regulator 27A and the curing agent regulator 27B. Since the comparison air supplied to the control valve 13 and the pressure adjusting air supplied to the regulators 27A and 27B have the same pressure, the primary side pressure in the main agent dedicated channel 25A and the hardener dedicated channel 25B The pressure value is a value corresponding to the pressure of the pressure adjusting air (a value smaller than the pressure of the pressure adjusting air).

  Further, when the discharge amount of the two-component paint from the coating gun 11 is reduced during painting, the value of the secondary pressure increases, so the opening degree of the drive air outlet 17 of the control valve 13 is reduced. The amount of drive air supplied to the air motor 23 is also reduced. As a result, the rotational speed of the air motor 23 decreases and the discharge amount from the gear pump 28 decreases, so that the amounts of the main agent and the curing agent input to the shared flow path 10 decrease, and as a result, the secondary pressure is normal. Decreases to a value (that is, the same value as the primary pressure).

  Further, when the discharge of the two-component paint from the coating gun 11 (that is, painting) is stopped, the secondary pressure also rises. At this time, the driving air outlet 17 is closed and the driving air to the air motor 23 is closed. Is stopped, and the air motor 23 is stopped. As a result, the discharge of the main agent and the curing agent from the gear pump 28 (that is, the introduction of the main agent and the curing agent into the common flow path 10) is stopped, so there is no possibility that the secondary pressure will rise abnormally. Further, when the discharge of the two-component paint from the coating gun 11 is stopped, the dedicated flow paths 25A and 25B for either the main agent or the curing agent are in communication with the shared flow path 10. Since the paths 25A and 25B are maintained at a predetermined primary pressure by the regulators 27A and 27B, the secondary pressure has the same value as the primary pressure.

  Therefore, when the discharge of the two-component paint from the coating gun 11 is resumed, the charging failure into the common flow path 10 (the amount of the main agent or the curing agent is charged) due to the secondary pressure becoming higher than the primary pressure. There is no risk that it will be less than the proper amount). Moreover, the damage of the common flow path 10 resulting from an abnormal rise in the secondary pressure is also prevented.

  In addition, when the flow of the main agent or the hardener stops due to the main agent or the hardener clogging in the dedicated flow paths 25A and 25B, based on the detection signal from the main agent sensor 30A or the hardener sensor 30B. The abnormality is notified and the driving of the air motor 23 and the gear pump 28 is stopped.

  As described above, the liquid agent supply apparatus according to the present embodiment includes the main agent dedicated channel 25A and the curing agent dedicated channel that individually supply the main agent and the curing agent to the upstream end (confluence 10P) of the common channel 10. 25B, gear pumps 28 are individually provided in the dedicated flow paths 25A and 25B, and the primary pressures in the main agent dedicated flow path 25A and the hardener dedicated flow path 25B are set as the main agent regulator 27A and the hardener regulator 27B. Thus, both the dedicated flow paths 25A and 25B are controlled so as to have the same pressure, and the primary side pressure and the secondary side pressure in the common flow path 10 are compared, and according to the comparison result, the primary side pressure is compared. The control valve 13 for controlling the driving of the gear pump 28 is provided so that the pressure and the secondary pressure are the same.

  According to this configuration, even if the secondary side pressure in the common flow path 10 fluctuates, the control valve 13 controls the drive of the gear pump 28, whereby the primary pressure of the dedicated flow paths 25 </ b> A and 25 </ b> B and the common flow path 10. Therefore, the amount of the main agent and the curing agent is not fluctuated illegally due to the pressure difference between the primary side pressure and the secondary side pressure. Is obtained.

  Further, the liquid supply device of the present embodiment compares the pressure adjusting air supplied to the main agent regulator 27A and the curing agent regulator 27B, and the comparison supplied to the control valve 13 in order to compare the primary side pressure and the secondary side pressure. A common air regulator 22 for making the same pressure as the working air, so that the primary side pressure corresponds to the pressure value of the pressure adjusting air, and the secondary side pressure corresponds to the pressure value of the comparison air It has become. According to this configuration, since the common air regulator 22 is used as means for making the pressure adjusting air and the comparison air the same pressure, the pressure difference between the primary side pressure and the secondary side pressure can be minimized. it can.

  In addition, an air motor 23 is provided as a pump driving means for shifting or stopping the gear pump 28. The air motor 23 controls the supply amount of driving air to the air motor 23 according to the pressure difference between the detection air and the secondary side pressure. The drive air inflow path 19 is connected to an air supply source 21 that is common to the pressure adjusting air and the comparison air. Thus, the structure of the entire apparatus is simplified by using the common air supply source 21 for driving air, pressure adjusting air, and comparative air.

  Each of the dedicated flow paths 25A and 25B is provided with a main agent on-off valve 29A and a hardener on-off valve 29B for controlling the charging and stopping operations of the main agent and the curing agent with respect to the common flow channel 10, and the main agent. The discharge amount per cycle of the gear pump 28 for use and the hardener is set to the same amount in both gear pumps 28, and both gear pumps 28 are driven in the same cycle by a common air motor 23 (pump drive means). It is like that. According to this configuration, the primary pressures in the two dedicated channels 25A and 25B can be matched with high accuracy.

  The air motor 23 is provided with a pump sensor 34 that outputs a detection signal every time the gear pump 28 is driven for one cycle. Based on the detection signal from the pump sensor 34, the main agent opening / closing valve 29 </ b> A and the hardener opening / closing valve are provided. By opening and closing 29B, the amounts of the main agent and the curing agent are individually controlled. Since the amounts of the main agent and the hardener are proportional to the discharge cycle of the gear pump 28, the main agent and the hardener are cured by opening and closing the main agent on-off valve 29A and the hardener on-off valve 29B based on the detection signal from the pump sensor 34. It is possible to obtain a highly accurate mixing ratio by accurately controlling the amount of the agent charged. Further, the mixing ratio can be arbitrarily changed.

  In addition, in the state where the supply of the liquid agent (main agent or curing agent) from the dedicated channels 25A and 25B to the common channel 10 is stopped in the main agent dedicated channel 25A and the curing agent dedicated channel 25B, An annular flow path 35 for circulating the liquid agent (main agent or curing agent) upstream from the gear pump 28 is provided. According to this configuration, it is possible to avoid that the pressure on the upstream side of the on-off valves 29A and 29B in the dedicated flow paths 25A and 25B becomes illegally (abnormally) high.

  In addition, the common flow path 10 is provided with a first mixer 12 that is located upstream of the control valve 13 and that stirs the main agent and the hardener charged in the common flow path 10. According to this construction, the main agent and the curing agent introduced into the common flow path 10 are agitated by the first mixer 12 and mixing proceeds. Therefore, even if the difference in viscosity between the main agent and the curing agent is large, the control can be performed. The viscosity of the mixed liquid agent (two-component paint) at the time when it reaches the valve 13 is stabilized. Thereby, the fluctuation | variation of the secondary side pressure resulting from the difference in a viscosity can be avoided.

  Further, whether or not the main agent and the curing agent are flowing at the downstream positions (positions near the confluence 10P, which is the downstream end) in the main agent dedicated flow path 25A and the hardener dedicated flow path 25B, respectively. Since the main agent sensor 30A and the curing agent sensor 30B for detection are provided, it is possible to detect an abnormality in the flow state of the main agent or the curing agent in each of the dedicated flow paths 25A and 25B.

<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 rotary gear pump is used as the positive displacement pump. However, according to the present invention, the positive displacement pump may be a rotary pump other than a gear pump such as a screw pump or a vane pump, or a diaphragm pump. A reciprocating pump such as a piston pump or a plunger pump may be used.
(2) In the above embodiment, the rotation speed of the two gear pumps is detected every cycle, and the amount of each liquid that is introduced into the common flow path is controlled, so that the change in the mixing ratio can be accommodated. When there is no need to change the mixing ratio of the two liquids, two types of gear pumps having a discharge rate ratio corresponding to the mixing ratio of the liquids are used. May be set.
(3) Although the discharge amount per cycle of the two gear pumps is the same in the above embodiment, two types of gear pumps having different discharge amounts may be used.
(4) In the above embodiment, the case where two kinds of liquids are alternately introduced into the common channel and mixed has been described. However, the present invention is a case where three or more kinds of liquids are sequentially introduced into the common channel and mixed. It can also be applied to.
(5) In the above embodiment, the liquid regulator is arranged at a position upstream of the positive displacement pump (gear pump) in the dedicated flow path. However, the liquid regulator is downstream of the positive displacement pump in the dedicated flow path. You may arrange in a position.
(6) In the above embodiment, the two positive displacement pumps are driven in the same cycle by the common pump drive means (air motor), but the two positive displacement pumps are driven by separate dedicated pump drive means. May be.
(7) In the above embodiment, the pressure adjusting air supplied to the liquid regulator and the comparison air supplied to the pump control means are set to the same pressure by one common air regulator. The air may be set to the same pressure by a dedicated air regulator.
(8) In the above embodiment, the positive displacement pump (gear pump) is driven by the air motor, but the positive displacement pump may be driven by a driving means other than the air motor.
(9) In the above embodiment, the driving air, the pressure adjusting air, and the comparative air driving source are shared, but these three types of air driving sources may be different from each other.
(10) In the above-described embodiment, in the dedicated channel that is not charged into the shared channel among the plurality of dedicated channels, the liquid agent is circulated to the dedicated channel while the charging is stopped. The liquid agent whose charging has been stopped may be returned not to the dedicated flow path but to the supply source of the liquid agent.
(11) In the above embodiment, a mixer for stirring a plurality of liquid agents introduced into the shared flow path is provided at a position upstream of the pump control means (control valve) in the shared flow path. The mixer may not be provided with a mixer.
(12) In the above embodiment, the case where the two-component paint obtained by mixing the main agent and the curing agent is applied to a coating liquid supply device that supplies the coating gun is described. The present invention can also be applied to a liquid supply device used for the purpose.

10 ... Common channel 12 ... First mixer (mixer)
13 ... Control valve (pump control means)
18 ... Comparison air inflow passage (comparison air passage)
19: Drive air inflow path (drive air flow path)
21 ... Air supply source 22 ... Air regulator 23 ... Air motor (pump drive means)
25A ... Main agent dedicated channel (dedicated channel)
25B: Dedicated flow path for hardener (dedicated flow path)
27A ... Main agent regulator (Liquid agent regulator)
27B ... Curing agent regulator (Liquid agent regulator)
28 ... Gear pump (positive displacement pump)
29A ... Opening / closing valve for main agent (open / close valve)
28B ... Curing agent open / close valve (open / close valve)
30A ... Main agent sensor (Liquid agent sensor)
30B ... Curing agent sensor (liquid agent sensor)
32 .. Pressure adjusting air inflow path (pressure adjusting air flow path)
34 ... Sensor for pump 35 ... Ring channel

Claims (8)

A liquid supply apparatus for supplying a plurality of liquid agents alternately or sequentially into a common flow path and mixing them,
A plurality of dedicated flow paths connected to the upstream end of the common flow path and individually supplying the plurality of liquid agents;
A plurality of positive displacement pumps individually provided in the plurality of dedicated flow paths;
A liquid regulator for controlling the primary side pressure in the plurality of dedicated channels to be the same pressure in all the dedicated channels;
The primary pressure and the secondary pressure in the shared flow path are compared, and the plurality of positive displacement pumps are configured so that the primary pressure and the secondary pressure are equal to each other according to the comparison result. And a pump control means for controlling the driving of the liquid agent supply device.   Common air for adjusting the pressure adjusting air supplied to the liquid regulator and the comparison air supplied to the pump control means for comparing the primary pressure and the secondary pressure. The liquid supply apparatus according to claim 1, further comprising a regulator. An air motor is provided as a pump driving means for shifting or stopping the positive displacement pump,
The pump control means is configured to control a supply amount of driving air to the air motor according to a pressure difference between the detection air and the secondary pressure,
The liquid agent supply device according to claim 2, wherein the flow path of the driving air is connected to an air supply source common to the pressure adjusting air and the comparison air. The plurality of dedicated flow paths are provided with a plurality of on-off valves for controlling a plurality of liquid agent charging operations and charging stop operations with respect to the common flow path,
The plurality of positive displacement pumps are designed to be driven in the same cycle by a common pump driving means,
The liquid supply according to any one of claims 1 to 3, wherein a discharge amount per cycle of the plurality of positive displacement pumps is the same for all of the positive displacement pumps. apparatus. The pump driving means is provided with a pump sensor that outputs a detection signal every time the positive displacement pump is driven for one cycle,
5. The liquid agent according to claim 4, wherein the input amounts of the plurality of liquid agents are individually controlled by opening and closing the plurality of on-off valves based on detection signals from the pump sensors. Feeding device.   The dedicated channel is provided with an annular channel that circulates the liquid agent to the upstream side of the positive displacement pump in a state where charging of the liquid agent from the dedicated channel to the common channel is stopped. The liquid supply device according to claim 4 or 5, wherein   2. The shared flow path is provided with a mixer that is located upstream of the pump control means and that stirs the plurality of liquid agents charged into the shared flow path. The liquid supply device according to any one of claims 6 to 6.   The liquid agent sensor for detecting whether or not the liquid agent is flowing is provided at a downstream position in the dedicated flow path. The liquid supply apparatus according to item.

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