JPH0233898Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a paint mixing and supplying device, and is a paint mixing system that enables accurate and rapid adjustment of the mixing ratio of each component paint forming the paint and the mixing amount per unit time. Regarding the supply device.

Various devices have been developed as paint mixing and supply devices. Figure 1 shows its standard configuration, in which paint A to be mixed is pumped.
P _A supplies paint B to mixer C through flow rate adjustment valve V _A and flow meter F _A , and paint B is supplied to mixer C by pump P _B through flow rate adjustment valve V _B and flow meter F _B , where both are mixed. The paint D thus formed is fed under pressure to a desired location through a flowmeter F. In addition, the mixing ratio of paint A and paint B and the supply amount of paint D are normally controlled by flow rate regulating valves V _A ,
This is done by adjusting the opening of _VB .

Therefore, when the viscosity of both paints A and B to be mixed is low and the mixing ratio and supply amount of both paints are approximately constant, the paint mixing and supplying device can operate smoothly without any particular problem. Can be done.

However, if paint A and paint B to be mixed have a relatively high viscosity, the flow regulating valves V _A and V _B may become clogged, or the flow of paint flowing through the valves V _A and V _B may become pulsating. This often occurs, and there are problems in that the mixed components of paint D become non-uniform and that it takes a lot of effort to repair the equipment. Furthermore, when the viscosity of paints A and B increases, the accuracy of flowmeters F _A and F _B deteriorates extremely, and paint D with a predetermined mixing ratio
formation becomes difficult. Particularly when the amount of paint D to be discharged and supplied is small, it becomes almost impossible to accurately control the mixing ratio, which is a major drawback.

Furthermore, in order to adjust the discharge supply amount of paint D, it is necessary to adjust the opening degrees of both regulating valves V _A and V _B , so there is a risk that the mixing ratio will change each time, making it difficult to control the discharge amount of paint D. The problem is that it becomes difficult.

The present invention aims to solve the above-mentioned problems in conventional paint mixing and supplying devices.
The purpose of the present invention is to provide a paint mixing and supplying device that can control the paint mixing ratio extremely accurately regardless of the paint viscosity, and can continuously control the amount of paint discharged and supplied without causing fluctuations in the mixing ratio. That is.

The present invention includes a gear pump installed in each pipeline for supplying paint to be mixed; a transmission that sets and adjusts the rotational speed of the gear pump; and a prime mover that simultaneously drives each gear pump via each of the transmissions. The basic configuration includes a mixer for mixing the paint discharged from each of the gear pumps.

Hereinafter, details will be explained based on an embodiment of the present invention shown in FIGS. 2 and 3.

FIG. 2 shows a case where the paint mixing and supplying device according to the present invention is used as a lining machine for the inner wall surface of a pipe. In the figure, 1 is a paint mixing supply device, 2 is a compressor, 3 is an air mixer, 4 is an accelerator, 5 is a pipe to be treated, 6 is a paint recovery device, 7 is a pressure regulator, 8 is a flow meter,
In the paint mixing and supplying device 1, the main ingredient A and the curing agent B of the epoxy resin paint are sent in fixed amounts at a time to a paint mixer 10 by a quantitative pressure feeder 9, where a so-called two-component mixed type epoxy resin paint D is formed. With,
The air is supplied to the air mixer 3 at a predetermined flow rate.

In the air mixer 3, the paint mixing supply device 1
Compressed air E is mixed with the paint D that has been pumped from the pump, and the mixed fluid G is subsequently sent to the accelerator 4. Compressed air E is further added to the mixed fluid G in the accelerator 4, and a mixed fluid H of the particulate paint D and air E is ejected from the pipe end into the inside of the pipe 5 to be treated. The paint particles in the mixed fluid H that is injected into the pipe are deposited and layered on the inner wall surface of the pipe inlet end, and are swept forward by the airflow of the mixed fluid H that is continuously injected from behind. As a result, a lining coating film is formed on the inner wall surface of the pipe.

On the other hand, the coating film thickness is controlled by changing the flow rate of the mixed fluid H (mainly the flow rate of the air flow E), the supply amount of the paint D, the viscosity of the paint D, etc.
Further, the amount of the paint D to be pumped and its viscosity are controlled by adjusting the rotation ratio of each gear pump forming the metering pump 9 of the paint mixing and supplying device 1 and the rotation speed of the driving motor.

FIG. 3 is a system diagram of the paint mixing and supplying apparatus 1, in which 11 is a tank for the main agent A for forming a two-component epoxy resin paint, and 12 is a tank for the curing agent B. Also, 13 is a strainer, 14a, 14
b is a pressure gauge, 15a, 15b are pressure switches, 1
6 is a check valve, and 17 is a paint outlet valve.

The quantitative pressure feeder 9, which constitutes the main part of the paint mixing and supplying device 1, includes a gear pump 19a installed in the pipeline 18a for the base agent A, a gear pump 19b installed in the pipeline 18b for the curing agent B, and both. A variable speed motor serving as a driving motor 20 for the gear pumps 19a and 19b, and a transmission 2 for both gear pumps.
1a and 21b. That is, transmissions 21a and 21 are installed at both ends of the drive shaft 22 of the motor 20.
b is arranged, and the transmissions 21a, 21b are
The configuration is such that both gear pumps 19a and 19b are driven simultaneously through the gear pumps 19a and 19b. Incidentally, the transmission 21a,
21b may be any type of transmission as long as it can continuously change the rotational speed of the gear pumps 19a, 19b. Furthermore, although this embodiment describes the mixing of a two-component epoxy resin consisting of main agent A and curing agent B, it goes without saying that any type of paint may be mixed.
Furthermore, although two types of paint are mixed in this example, when mixing two or more types of paint, for example, three types of paint, the gear pump and transmission are
It may be possible to use a configuration in which these are all driven simultaneously by the same prime mover.

Next, the functions and effects of the paint mixing and supplying device will be explained.

When supplying the paint D, the temperatures of the base agent A and curing agent B are controlled by a heater (not shown) and maintained at a predetermined temperature. Next, the transmissions 21a, 21b of both gear pumps 19a, 19b are adjusted, and the respective rotational speeds of gear pumps 19a, 19b are adjusted.
That is, the respective discharge amounts are set to be at a predetermined ratio. The mixing ratio is determined based on the desired viscosity of the mixed coating material D, and in a two-component mixed epoxy resin coating for pipe inner wall lining, the main ingredient A
The ratio of hardening agent B and curing agent B is set to approximately 2:1. Once the mixing ratio has been set, the motor 20 is started and adjusted to a predetermined rotation speed. Gear pump 19a, 19
The main agent A and curing agent B, which are pumped in fixed amounts according to the rotation speed from b, are delivered to the relief valves 23a and 23b.
The paint is forced into the mixer 10 through the paint outlet valve 17, where it is mixed and then forced to the outside through the paint outlet valve 17.

Normal adjustment of the supply amount of paint D is performed mainly by controlling the rotation speed of the motor 20, and when increasing the discharge amount, the rotation speed of the gear motor is increased.
In addition, when reducing the discharge amount, the rotation speed of the gear motor is lowered. In this case, the opening degree of the paint outlet valve 17 is kept approximately constant, but if the change in the amount of paint supplied is relatively small, the paint outlet valve 17 is adjusted by keeping the motor rotation speed constant. It is also possible to control the flow rate.

Mixer 1 with main agent A and curing agent B in a predetermined ratio.
If the pressure is being fed to 0, the pressure gauges 14a, 1
4b indicates a constant pressure value depending on the mixing ratio.
On the other hand, if the mixing ratio of both changes for some reason, the pressure gauges 14a, 14b
The indication varies from the pressure value in the steady state, and this variation is detected by the pressure switches 15a and 15b, and an abnormality in the mixture ratio is notified to the outside. In FIG. 3, 24 is a supply port for cleaning thinner.

In this invention, paint A to be mixed, paint B
... are pumped to the mixer 10 by gear pumps 19a, 19b, respectively, and each gear pump 19a, 19b... is connected to a transmission 21a, 21b...
Since the configuration is such that they are driven all at once by a single prime mover through Can be set to a value. Furthermore, compared to setting the mixture ratio by adjusting the valve, it is possible to set the mixture ratio more accurately, and there is no possibility that the mixture ratio will fluctuate during operation even if the amount of paint supplied is extremely small. .

In addition, by controlling the rotational speed of the prime mover, the amount of paint D that is pumped can be adjusted extremely accurately and continuously, making it possible to adjust the amount of paint D to be pumped extremely accurately and continuously. It is especially effective in such cases.

As mentioned above, the present invention has excellent practical utility.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional paint mixing and supplying device. FIG. 2 is an operational system diagram when the paint mixing and supplying device according to the present invention is used for pipe lining. FIG. 3 is a system diagram of the paint mixing and supplying device according to the present invention. A... Paint to be mixed (main ingredient), B... Other paint to be mixed (curing agent), D... Paint formed,
10... Mixer, 11, 12... Tank, 18
a...Base agent line, 18b...Curing agent line, 1
9a, 19b... Gear pump, 20... Prime mover,
21a, 21b...Transmission, 22...Motor drive shaft.

Claims (1)

[Scope of utility model registration request] Pipelines 18 for the respective supply of paint to be mixed
a, 18b... gear pump 19a,
19b... and the gear pumps 19a, 19b...
Transmissions 21a, 21b...
...; a prime mover 20 that drives the gear pumps 19a, 19b all at once via the transmissions 21a, 21b; and the gear pumps 19a, 19b...
A paint mixing and supplying device comprising a mixer 10 that mixes paints A, B, etc. discharged from...