JPS58186461A - Washing mechanism of mixing part of liquid mixing-feeding device - Google Patents

Abstract

PURPOSE:To wash a mixing part quickly with a small amount of washing liquid, by connecting a washing liquid supplying piping or a compressed air supplying piping to a flow-in piping, through which raw liquids to be mixed are flowed into a confluent chamber, by changing them alternately each other. CONSTITUTION:When washing is performed, raw liquids supplying pipings (a), (b) are closed and a washing liquid supplying piping 26 is opened through three- way type valves 8, 17. And firstly, a pressurized air supplying piping 29 is connected to the piping 26 by operating a three-way type valve V to push out a residue, remaining in a confluent manifold 19 and a mixing piping 20-, by the pressurized air. Next, a solvent supplying piping 24 is connected to the piping 26 to dissolve and remove the stuck residue. Said operations are repeated according to demand.

Description

[Detailed description of the invention] The present invention relates to a mixing section cleaning mechanism for a liquid mixing and supplying device.

For mixing and supplying equipment such as synthetic resin paints that are cured by mixing the base agent and curing agent, after use, cleaning liquid (solvent) is flowed into the converging mixture passage to remove the remaining mixture. It is necessary to wash and remove.

This cleaning consumes a relatively large amount of solvent and requires a relatively long time. Additionally, when reusing the device,
It is necessary to push out the solvent remaining downstream from the merging chamber through the merging mixed paint, and this has to be visually confirmed, which is a hassle.

An object of the present invention is to provide a liquid mixing and supplying device that can be quickly and reliably cleaned after use with a relatively small amount of solvent, and does not require confirmation of completion of solvent discharge at the beginning of use. There is a particular thing.

A feature of the present invention is that the upstream end of the cleaning solvent supply pipe is connectable to either the solvent supply pipe or the compressed gas supply pipe, so that the solvent and compressed gas (usually air) can be connected to each other. When used in combination, the mixing section passage of the liquid mixing and supplying device is cleaned.

Figure 11i1 is a system diagram of a two-liquid heating and supplying device used in the practice of the present invention. The main agent A is produced by air pressure acting from the air pressure source 1 through the entire pipe line 2), from the storage tank 3 to the pipe line 4, through the pilot type metering-bypass switching valve 5, the measuring cylinder 6, the pipe line 7, and the three-way switching valve 8. Through the inlet pipe 1 of the mixing supply device 9
Sent to 0. The curing agent B is transferred by air pressure acting through the pipe 11 from the storage tank 12 to the pipe 13, to the pilot metering/bypass switching valve 14, to the metering cylinder 15, to the pipe 16.
, through the three-way switching valve 17 to the inlet line 1 of the mixing supply device 9
Sent to 8th. The base agent A and the curing agent B are delivered to the spray gun 21 through the mixer manifold 19 and static mixer 20 of the mixing supply device 9 .

The flow of base agent A and curing agent B through metering cylinders 6 and 15 is as follows. In the illustrated state,
The main agent enters the left chamber of the metering cylinder 6 through the pilot type metering-bypass switching valve 5 due to the action of air pressure in the storage tank 3, and the pressure pushes the piston 30 to the right, so that the metering cylinder 6 The main agent in the right chamber of the body is sent to conduit 7. Similarly, the hardening agent B is delivered from the right chamber of the metering cylinder 15 into the conduit 16. Measuring cylinder 6.15
is pivoted at one end to a fixed shaft.

A piston that reciprocates within the measuring cylinder 6.15/30.3
The outer end of one piston rod 32, 33 is pivotally connected to a swing lever 34. The swing lever 34 is pivotally attached to the fixed shaft 41 and swings around its nine end.

The mounting position of the outer end of the piston rod 32, 33 with respect to the swing lever 34 can be changed, and by changing the mounting position, the mixing ratio of the main agent A and the curing agent B can be changed.

The pilot metering-bypass switching valve 5.14 is operated by air pressure acting through the air vent valve 35 and the switching valve 36. The switching valve 36 is attached to the metering lever 34,
Switching is performed by a switching frame 37 that reciprocates along with this. Pilot type metering by switching the switching valve 36
The bypass switching valve 5.14 is switched, so that the direction of movement of the piston 30.31 of the metering cylinder is reversed.

A cleaning fluid inflow pipe 26 serves as a mechanism for cleaning the mixing section.
A solvent supply pipe 24 is connected to one of the upstream ends of the pipe 24 through a valve 25, and a compressed air supply pipe 29 is connected to the other end through a check valve 28 and a valve 27 with a bleed. The valves 25 and 27 are configured so that when one opens, the other closes, and in the middle, both close.

The check valve 28 is for preventing the good solvent leaking from the valve 25 from entering the compressed air supply pipe 29.

After finishing using the mixing supply device (after finishing painting work), valve 27
If the pressurized air supply pipe 29 is first connected to the cleaning fluid feed pipe 26 by operating the
8 into the confluence manifold 19 and into the mixing line 20, with the residue present in that passage passing through its downstream opening).
It is squeezed out.

Next, by operating the valves 27 and 25' to connect the solvent supply pipe 24 to the cleaning fluid feed pipe 26, the solvent will flow into the passage of the mixing supply device, and no residual adhesion will occur in the passage. The scales of the mixed paint are removed.

Then, when the compressed air supply pipe 29 is connected to the cleaning fluid inflow pipe 26 again, the pressurized air flows at high speed in the passage of the mixing supply device, and the residual agent B present in the passage is removed from the opening. Once discharged 1, cleaning of the passageway of the mixing supply device is completed. By alternately repeating the high-speed flow of pressurized air and the flow of the solvent within the passage of the mixing supply device, cleaning can be carried out more effectively. - Fig. 2 shows another embodiment, in which a three-way switching valve V is provided at the upstream end of the cleaning fluid inflow pipe 26, one of the three-way switching valve V is connected to the solvent supply pipe 24, and the other is checked. It is connected via a valve 28 to a compressed air supply line 29 . After using the device,
By operating the three-way switching valve V, you can switch between cleaning solvent and air blow with a single touch.

As is clear from the above description, in the mixing section cleaning mechanism of the present invention, when cleaning the mixing supply passage, most of the mixing residue present in the passage is first forced out by high-speed air circulation. Since it can be removed, the solvent only needs to be used to wash the mixture adhering to the inner wall of the pipe, and only a small amount of solvent can be used. Furthermore, since the inside of the mixing supply passage of the mixing supply device of the present invention is emptied at the end of its use, unlike the conventional mixing supply device 1, the solvent remaining in the mixing supply passage before the start of its use is There is no need to worry about confirming the completion of release.

[Brief explanation of the drawing]

FIG. 1 shows the implementation example of the present invention! The two-liquid heating supply device to be used, tX2 diagram shows another example.

Claims (1)

[Claims] A substitute pipe for the liquids to be mixed (through the operation of one valve for each inflow pipe for each of the plurality of inflow pipes for causing the liquids to be mixed to flow into the merging chamber), and a mixing pipe for mixing the merging liquids flowing out from the merging chamber. In the liquid mixing and supplying device having a cleaning fluid, the cleaning fluid supply pipe is connected with K so that the cleaning fluid can be further supplied,
The cleaning mechanism is configured such that either the cleaning fluid supply pipeline or the compressed gas supply pipeline is connected to the upstream end of the cleaning fluid supply pipeline by operating a valve.