JPH07185409A - Two-part liquid mixing type spray device - Google Patents

Abstract

PURPOSE:To provide a two-part mixing type spray device which keeps the mixing ratio constant regardless of the discharge amount and prevents the defective curing because of the variation of mixing ratio. CONSTITUTION:A main agent pump 12 and a main agent flowmeter 16 are disposed on a main agent piping 1 extending from a main agent tank 11 to an atomizing head 3. A curing agent pump 22 and a curing agent flowmeter 26 are discharged in a curing agent piping 2 extending from the curing agent tank 21 to the atomizing head 3. The number of rotations of the curing agent pump 22 is set manually. Also the number of rotations of the main agent pump 12 is feed back controlled by a programmable controller 5 in a manner of keeping the flow rate ratio sensed by the main agent flowmeter 16 and the curing agent flowmeter 26 at the blend ratio set by a setting switch 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-liquid mixing type spraying device used for spraying a two-liquid type coating material such as polyurethane or polyester.

[0002]

2. Description of the Related Art Conventionally, as a two-liquid mixing type spraying device of this type, a main agent and a curing agent are respectively pressurized by pumps, then mixed using a static mixer, and an atomizer such as a spray gun is used. Are provided on the construction surface such as wall surface or floor surface (Japanese Patent Publication No. 5-4130).
(See Japanese Patent Publication No. 5).

[0003]

By the way, the above-mentioned 2
In the liquid mixing type spraying device, the discharge amount of both coating material of the main agent and the curing agent is fixed, so if the discharge amount of one of them changes for some reason, the mixing ratio of both However, there is a problem that the work itself will not be established due to the change in the curing rate.

An object of the present invention is to solve the above problems and to make it possible to adjust the discharge amount of each coating material and to keep the mixing ratio of both coating materials stable at a set value. An object of the present invention is to provide a two-liquid mixing type spraying device that keeps the mixing ratio constant regardless of the discharge amount, prevents the curing failure due to the fluctuation of the mixing ratio, and enables even an unskilled person to perform the spraying work. To do.

[0005]

In order to achieve the above object, the invention of claim 1 includes a main agent tank and a curing agent tank respectively containing two liquids of a main agent and a curing agent, and a main agent and a curing agent. An atomizing head equipped with a static mixer for mixing and spraying the mixed coating material onto the construction surface, and a main agent pump provided in the main agent pipe between the main agent tank and the atomizing head to take out the main agent from the main agent tank and pressurize it, A main agent flow meter installed in the main agent line to detect the flow rate of the main agent pressurized by the main agent pump, and a hardener provided in the hardener line between the hardener tank and the atomizing head, and the hardener is removed from the hardener tank. Set a target value of the hardener pump that pressurizes the hardener, a hardener flow meter that is installed in the hardener conduit to detect the flow rate of the hardener pressurized by the hardener pump, and the mixing ratio of the main agent and the hardener With the setting section A controller for performing feedback control of at least one of the main agent pump and the curing agent pump so that the ratio of the flow rates detected by the main agent flow meter and the curing agent flow meter matches the target value set in the setting unit. I have it.

The invention of claim 2 is characterized in that, in the invention of claim 1, the inner diameter of the main agent conduit is set larger than that of the hardening agent conduit.

[0007]

According to the structure of the first aspect of the present invention, the pressure feeding capability of at least one of the main agent pump and the hardener pump is fed back so that the flow rate ratio between the main agent and the hardener matches the target value set in the setting section. Since it is controlled, it is possible to stably maintain the mixing ratio of the main agent and the curing agent by setting the target value. That is, by setting a target value according to the mixing ratio of the main agent and the curing agent, it is possible to handle various coating materials having different mixing ratios, and always maintain the mixing ratio of the main agent and the curing agent at an appropriate ratio. Spraying work can be performed.

According to the second aspect of the invention, the inner diameter of the main material conduit is set larger than that of the hardening material conduit, and in general, a two-component type coating material such as polyurethane or polyester is used. Since the polyol, which is the main agent, has a higher viscosity than the curing agent, if the main agent conduit is formed to have a large diameter, the flow rate can be adjusted widely without abnormally increasing the internal pressure.

[0009]

EXAMPLE FIG. 1 shows the overall structure. Main agent is the main agent tank 1
1 and the curing agent is stored in the curing agent tank 21. Since it is necessary to keep the main agent and the curing agent at about 40 ° C., the heat retaining heaters 11a and 21a are provided on the outer walls of the main agent tank 11 and the curing agent tank 21, respectively, and power is supplied to the heat retaining heaters 11a and 21a. By providing a thermostat (not shown) inserted in the passage, power supply to the heat-retaining heaters 11a and 21a is controlled so that the main component and the curing agent are kept at about 40 ° C. The heat-retaining heaters 11a and 21a do not heat the main agent and the curing agent, but function to maintain the temperature of the main agent and the curing agent which are heated before being charged into the main agent tank 11 and the curing agent tank 21. Therefore, the heat retention heater 11
As a and 21a, it is possible to use inexpensive ones that generate a small amount of heat.

The main agent and the curing agent are respectively taken out from the main agent tank 11 and the curing agent tank 21 by a main agent pump 12 and a curing agent pump 22 using a trochoid pump and pressurized. The main agent pump 12 and the hardening agent pump 22 are a continuously variable transmission 13 using a ring cone,
It is connected to the motor as a drive source through 23,
The continuously variable transmission 13 coupled to the main agent pump 12 has a built-in pilot motor, and the pumping ability of the main agent pump 12 can be adjusted by giving an adjustment signal to the pilot motor. Also, the curing agent pump 2
The continuously variable transmission 23 coupled to the two is adjusted by manual operation.

The main agent and the curing agent, which are respectively pressurized by the main agent pump 12 and the curing agent pump 22, are mixed by a static mixer 31 incorporated in the atomizing head 3, and the mixture is pumped into the atomizing head 3. It is atomized by the existing air and discharged to the outside. Further, the main agent line 1 from the main agent tank 11 to the atomizing head 3 and the hardener line 2 from the curing agent tank 21 to the atomizing head 3 are
Between the main agent pump 12 and the hardening agent pump 22 and the atomizing head 3, respectively, pressure gauges 15 and 25 for detecting the internal pressures of the main agent conduit 1 and the hardening agent conduit 2, respectively, and a number of pulses proportional to the flow rate. A main agent flow meter 16 and a curing agent flow meter 26 for outputting are disposed.

Further, between the main agent pump 12 and the hardening agent pump 22 and the main agent flow meter 15 and the hardening agent flow meter 25, the bypass pipes 18,
One end of each of the 28 is connected to the bypass pipe 1
A part of the main agent and the curing agent are returned to the main agent tank 11 and the curing agent tank 21 through 8, 28. With this configuration, the main agent line 1 and the curing agent line 2
The pulsation is reduced on the downstream side of the three-way valves 17 and 27 in FIG.

Further, the inner diameter of the main agent conduit 1 is set larger than the inner diameter of the hardening agent conduit 2. For example, the main agent line 1
When the inner diameter of the hardener pipe line 2 is 3/4 (inch), the inner diameter of the hardening agent conduit 2 is set to 3/8 (inch) or the like. Generally, the base resin has a higher viscosity than the curing agent,
By making the inner diameters of the main agent conduit 1 and the hardening agent conduit 2 different in this way, it becomes easy to set the internal pressures of the main agent conduit 1 and the hardening agent conduit 2 to desired values. That is, by forming the main agent conduit 1 to have a larger diameter than the hardening agent conduit 2, the flow rate can be adjusted widely without abnormally increasing the internal pressure of the main agent conduit 1. .

On the other hand, the air to the atomizing head 3 is supplied from the air compressor 41, and between the air compressor 41 and the atomizing head 3, the air compressor 41 and the atomizing head 3 are manually operated, respectively. Valves 42 and 4
3 is provided. In addition, a check valve (not shown) is provided in the main agent line 1 and the hardening agent line 2 near the atomizing head 3.
Is provided to prevent backflow of the main agent and curing agent. Further, the atomizing head 3 is also provided with an operation switch 32 for turning the device on and off.

By the way, the pilot motor for controlling the stepless speed reducer 13 provided in the main agent pump 12 is feedback-controlled by a programmable controller (hereinafter abbreviated as a sequencer) 5 as a control device. In the sequencer 5, the flow rate measured by the main agent flow meter 16 and the curing agent flow meter 26 is set for a predetermined time (for example, 4
Every second), and the ratio of the integrated values of the main agent flow meter 16 and the curing agent flow meter 26 is calculated. Thus, the integrated value per unit time is obtained in order to suppress the influence of the pulsation of the main agent pump 12 and the curing agent pump 22 and stabilize the detected value.

On the other hand, the sequencer 5 includes an operation switch 51 for setting the operation state of the sequencer 5, and the sequencer 5
It is connected to a display device 52 for displaying information input to. The operation switch 51 includes a setting switch as a setting unit for setting a numerical value, a mode selection switch for switching between a manual mode and an automatic mode, which will be described later, a display switching switch for switching the display content of the display 52, and a display content of the display 52. It is equipped with a reset switch and so on. Of the switches constituting the operation switch 51, the setting switch is a digital switch, and the other switches are push button switches. By observing the display contents of the indicator 52 using an LED indicator, the main agent and the curing agent can be detected. The integrated flow rate and the contents when an abnormality occurs can be confirmed.

The setting switch is a switch for setting the flow rate of the main agent, and changes the meaning of the set value depending on whether the manual mode or the automatic mode is selected by the mode selection switch. That is, the numerical value set by the setting switch means the rotation speed of the main agent pump 11 in the manual mode, and the mixing ratio of the main agent to the curing agent in the automatic mode. Here, the numerical value that can be set with the setting switch has the allowable range set in each of the manual mode and the automatic mode, and if you try to set a value larger than the upper limit value of the allowable range, the upper limit value will be selected and the upper limit value will be selected. Also, when trying to set a small value, the lower limit value is selected. For example, in the manual mode, the rotation speed of the main agent pump 12 can be set in the range of 60 to 360 RPM, and in the setting of 60 RPM or less, 60 RPM and 360 R
In the setting above PM, it is set to 360 RPM. Also,
In the automatic mode, the mixing ratio of the main agent to the curing agent is 5
It can be set in the range of 0 to 150%, and is set to 50% when the setting is 50% or less and 150% when the setting is 150% or more.

In the manual mode, the number of revolutions of the main agent pump 12 is set by the setting switch, and the main agent pump 12 is operated regardless of the detected values of the main agent flow meter 16 and the curing agent flow meter 26. On the other hand, in the automatic mode, the setting value of the setting switch is the mixing ratio of the main agent to the curing agent, so that the output values of the main agent flow meter 16 and the curing agent flow meter 26 that detect the flow rates of the main agent and the curing agent, respectively. The ratio is obtained, this ratio is compared with the target value set by the setting switch, and the pilot motor is feedback-controlled so as to reduce the error between them, and the pumping capacity of the main agent pump 12 is adjusted. In addition, in feedback control,
Since the dead time of the system is large and the fluctuation in a short time is relatively large, it is desirable to add not only proportional control but also differential control and integral control.

As described above, the flow rate of the hardener is set by manually operating the continuously variable transmission 23 connected to the hardener pump 22, and the flow rate of the main agent in the manual mode is the main agent. It is set as the number of rotations of the motor 12, and in the automatic mode, it is set as the mixing ratio of the main agent and the curing agent. Especially, in the automatic mode, the flow rate of the main agent is adjusted according to the flow rate of the curing agent so as to correspond to the mixing ratio set by the setting switch.
In other words, set the flow rate of one of the main agent and the curing agent,
For the other, the flow rate is determined by specifying the mixing ratio, so if you set the flow rate of the curing agent as a guide for the spray amount per unit time and set the mixing ratio according to the operating conditions (temperature, humidity, etc.). Since the flow rate of the main agent is automatically set, it is more practical than the case where both the flow rates of the main agent and the curing agent are set by the flow rates. Further, only the main agent pump 12 is subjected to feedback control of the pumping ability, and the curing agent pump 22 is manually operated to set the pressure feeding ability.
The control becomes easier than the case where the feedback control is performed for both the hardener pump 22 and the hardener pump 22.

The display changeover switch causes the display 52 to selectively display the integrated value of the flow rate of the main agent, the integrated value of the flow rate of the curing agent, or the integrated value of the total flow rate of the main agent and the curing agent. A selection switch and a second selection switch that is operated when the flow rate of the main agent is displayed to cause the display unit 52 to display the mixing ratio of the main agent to the curing agent are provided. By operating the reset switch in each selection state of the first selection switch, only the displayed numerical value can be reset to zero. For example, if the reset switch is operated while the integrated value of the flow rate of the main agent is displayed, only the flow rate of the main agent is reset to 0. The display value is updated every 4 seconds. Further, the display 52 also displays the instantaneous flow rate detected by the main agent flow meter 16 and the curing agent flow meter 26. The instantaneous flow rate is always displayed and is constantly fluctuated due to the pulsation of the main agent pump 12 and the curing agent pump 22 and is not stable, but serves as a guide for the flow rates of the main agent and the curing agent.

The sequencer 5 performs not only feedback control of the main agent pump 12 as described above but also system abnormality monitoring. That is, the pressure gauges 15 and 25 monitor the internal pressures of the main agent pipeline 1 and the curing agent pipeline 2, and when the internal pressures of the main agent pipeline 1 and the curing agent pipeline 2 reach a predetermined upper limit value, the operation is stopped. In this case, the notification is made acoustically or visually. Further, when the allowable range with respect to the target value set by the setting switch is deviated or when the main agent or the curing agent runs out of liquid, an acoustic or visual notification is given. Other abnormalities are also notified using the display device 52 or the like according to each type.

To use the spraying device described above, the procedure is as shown in FIG. First, the main agent and the curing agent are introduced into the main agent tank 11 and the curing agent tank 21, respectively, with the main power supply turned on. At this time, as the main agent and the curing agent, those heated to about 40 ° C. are added. The introduced main agent and curing agent are kept at a substantially constant temperature by the heat-retaining heaters 11a and 21a and the thermostat. Next, the operation mode is selected and a desired target value is set by the setting switch. Here, usually select the automatic mode,
A mixture ratio is set as the target value. Then valve 4
2, 2 and 43 are opened and the operation switch 32 is turned on, the main agent pump 12, the curing agent pump 22 and the air compressor 41 are operated (S1), and the coating material is blown out from the atomizing head 3. Here, immediately after the operation switch 32 is turned on, since the main agent and the curing agent have not reached the main agent flow meter 16 and the curing agent flow meter 26, after a predetermined time (for example, 4 seconds) for stabilizing the system has elapsed. From (S2), the outputs of the pressure gauges 15 and 25, the main agent flow meter 16, and the curing agent flow meter 26 are taken into the sequencer 5 at regular intervals (S3). Also, the discharge amount of the coating material is 2
By manually adjusting 3 to adjust the discharge amount per unit time, the mixing ratio of the main agent and the curing agent is maintained. When an abnormality is detected by the output values of the pressure gauges 15 and 25, the main agent flow meter 16, and the curing agent flow meter 26 (S4, S5), the abnormality is notified (S4).
6) The main agent pump 12 and the curing agent pump 22 are stopped (S7). If there is no abnormality, the pumping capacity of the main agent pump 12 is feedback-controlled as described above (S8).

[0023]

According to the first aspect of the present invention, the pressure feed capability of at least one of the main agent pump and the curing agent pump is feedback-controlled so that the flow rate ratio between the main agent and the curing agent matches the target value set in the setting section. Therefore, if the target value is set, there is an effect that the mixing ratio of the main agent and the curing agent can be stably maintained. That is, if a target value is set according to the mixing ratio of the main agent and the curing agent, various coating materials with different mixing ratios can be dealt with, and the mixing ratio of the main agent and the curing agent is always a proper ratio. Therefore, there is an advantage that the spraying work can be carried out while the temperature is kept at the above value, and as a result, the worst failure such as the curing failure can be prevented. In addition, since the curing failure can be prevented by setting the blending ratio according to the coating material, even a skilled person can perform the spraying work without causing the curing failure.

According to the second aspect of the present invention, the inner diameter of the main material conduit is set to be larger than that of the hardening material conduit. Therefore, if the main material conduit is formed to have a large diameter, the main material having high viscosity will pass through. This has the advantage that the flow rate adjustment range can be widened without abnormally increasing the internal pressure of the pipeline.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment.

FIG. 2 is a flowchart showing the operation of the embodiment.

[Explanation of symbols]

 1 Main Agent Pipeline 2 Hardener Pipeline 3 Atomization Head 5 Programmable Controller 11 Main Agent Tank 12 Main Agent Pump 16 Main Agent Flowmeter 21 Hardener Tank 22 Hardener Pump 26 Hardener Flowmeter 31 Static Mixer

Claims (2)

[Claims] 1. An atomizing head for spraying a mixed coating material onto a construction surface, which comprises a main agent tank and a curing agent tank respectively containing two liquids of a main agent and a curing agent, and a static mixer for mixing the main agent and the curing agent. And a main agent pump provided in the main agent line between the main agent tank and the atomizing head to take out the main agent from the main agent tank and pressurize it, and detect the flow rate of the main agent pressurized by the main agent pump provided in the main agent line With the main agent flow meter, a curing agent pump installed in the curing agent conduit between the curing agent tank and the atomizing head to take out and pressurize the curing agent from the curing agent tank, and a curing agent pump installed in the curing agent conduit. A curing agent flow meter that detects the flow rate of the pressurized curing agent, a setting unit that sets the mixing ratio of the main agent and the curing agent as a target value, and the flow rate detected by the main agent flow meter and the curing agent flow meter, respectively. ratio 2. A two-liquid mixing type spraying device, comprising: a control device that feedback-controls the pumping ability of at least one of the main agent pump and the curing agent pump so that the value matches the target value set by the setting unit. 2. The two-liquid mixing type spraying device according to claim 1, wherein the main agent pipe line has an inner diameter larger than that of the hardening agent pipe line.