JPH0263577A - Coating material supplying mechanism - Google Patents

Abstract

PURPOSE:To allow immediate discharging of a coating material at a required discharge quantity when a coater is started by interposing an inch spraying valve which is temporarily opened only before the discharge of the coating material at the prescribed discharge quantity from the coater is started to a bypass piping. CONSTITUTION:A color change valve 9 which supplies the coating material of the next color is changed over from a tube piping 13 side to a tube piping 11 side when the coater 5 is started. A trigger valve 14 is then opened simultaneously and the inch spraying valve 17 interposed to the bypass piping 15 is temporarily opened so that the coating material fed by a pressure through a coating material feed pipeline 3 from a coating material supply source 1 is supplied through a regulator 16 interposed to the bypass piping 15 at the prescribed high pressure corresponding to the discharge quantity thereof directly to the coater 5. The coating material of the next color is packed instantaneously from the tube piping 11 into the coater 5 in this way and the coating material is simultaneously inch-sprayed from the coater 5. The discharge of the required amt. of the coating material is, therefore, rapidly started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating agent supply mechanism that supplies a coating agent to a coating machine, which is pumped from a coating agent supply source.

[Conventional technology]

Conventionally, in a general coating material supply mechanism, coating material is pumped from a coating material supply source through a coating material feeding pipe line with a circulation pump interposed therein, and the coating material is applied through a coating material supply pipe that is branched and connected to the coating material feeding pipe line. The coating agent that is supplied to the coating machine and discharged from the coating machine, and which is not discharged from the coating machine, is returned to the coating agent supply source through the coating agent return pipe (see Utility Model Application Publication No. 57-82973). reference).

The coating agent that is pressure-fed from the coating agent supply source through the coating agent feed pipe is adjusted to a predetermined pressure according to the discharge amount of the coating machine by a regulator (pressure adjustment valve) installed in the coating agent supply pipe. It has become so.

However, the viscosity of coating agents varies depending on the type of coating agent and the type and amount of solvent contained in it, and the viscosity of the same coating agent also changes depending on the temperature difference between morning and evening, so it is not possible to simply adjust the pressure of coating agent using a regulator. There was a problem in that it was not possible to delicately control the discharge amount of the coating material.

For this reason, in automotive painting, which requires high-quality coating, a regulator and a metering pump are interposed in the coating agent supply pipe branched into the coating agent feed line, and the rotation of the metering pump is controlled by an inverter. A method of strictly controlling the amount of coating agent discharged is adopted (Utility Model Opening in 1983-
(See Publication No. 58869).

[Problem to be solved by the invention]

However, metering pumps that are configured to delicately control the amount of coating agent discharged have poor responsiveness because the amount of coating agent that can be delivered is very small, and the amount of coating agent that can be delivered to the applicator from the time the applicator is started is very low. There was a drawback that it took time for the liquid to be filled and to start discharging at the required discharge amount.

In addition, flexible tube piping is used to connect the coating agent supply piping equipped with a metering pump and the applicator, taking into consideration the operability of the applicator. 5 to 6 times until the tube pipe receives the pressure of the coating agent sent by the metering pump and reaches an expanded state according to the pressure.
The amount of coating material discharged over a period of seconds is lower than the required value, resulting in a problem of insufficient coating, in which the coating is thinner in the areas coated during this period than in other areas. In addition, in the case of a two-component hot-mix paint, there is a problem that the mixing ratio of the base agent and the curing agent changes, resulting in poor coating film quality.

Therefore, it is not possible to immediately fill the coating agent with the coating agent and discharge it at the required discharge amount at the same time as the coating machine is started. It took a long time to start applying the paint, making it impossible to quickly change colors.

Therefore, the technical problem of the present invention is to immediately fill the applicator with a coating agent when the applicator is started and to start dispensing at the required amount. The purpose is to improve film quality and shorten color change time in multi-color painting.

[Means to solve the problem]

In order to achieve this object, the present invention includes a regulator for adjusting the pressure of the coating agent in a coating agent supply pipe that supplies the coating agent fed under pressure from a coating agent supply source to a coating machine, and a regulator for adjusting the pressure with the regulator. In the coating agent supply mechanism, the regulator and the metering pump are interposed in the coating agent supply piping, and the coating agent supplying mechanism is provided with a metering pump that supplies the coating agent to the coating machine at a predetermined flow rate according to the discharge amount of the coating agent. Bypass piping is provided to bypass the area where the coating material is removed, and the bypass piping is provided with a temporary temporary pipe that operates at the same time as the applicator is started and until the applicator starts discharging the coating agent at a predetermined amount. It is characterized by being equipped with a quick-release valve that is opened at the same time.

(Function) According to the present invention, the blow valve installed in the bypass pipe is opened at the same time as the applicator is started, and the applicator pumped from the applicator supply source is directly supplied to the applicator at a predetermined high pressure. The coating agent is supplied and instantaneously filled up to the applicator, and the coating agent that starts being discharged from the applicator quickly reaches a predetermined discharge amount, so that coating can be started immediately after checking the discharge state.

In addition, when the discharge amount of the coating agent reaches a predetermined value, the blow valve closes and the bypass piping is cut off, and from then on, the coating agent supplied by the metering pump installed in the coating agent supply piping is supplied by the pump. The coating machine discharges the coating material at a predetermined controlled discharge amount.

Therefore, it is possible to immediately start discharging the required amount of coating agent from the applicator at the same time as the applicator is started, and it is possible to reliably prevent insufficient coating at the start of painting and improve the quality of the coating. At the same time, in multi-color painting, the color change time from finishing the painting of the previous color paint to starting painting the next color paint can be significantly shortened.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a flow sheet showing an example of a coating agent supply mechanism according to the present invention, and FIG. 2 is a time chart showing its operation.

The coating agent supply mechanism shown in this example includes a coating agent supply pipe (3) in which a circulation pump (2) that pumps the coating agent at high pressure from a coating agent supply source (1) is inserted. ), and a gear pump, etc. that supplies the pressure-regulated coating agent from the regulator (4) to the applicator (5) at a predetermined flow rate depending on its discharge amount. A coating agent supply pipe (7) interposed with a metering pump (6)
is connected to the branch.

The coating agent supply pipe (7) and the coating machine (5) are connected by tube pipes 0ω and (i) that are connected to each other via a color change valve (9) attached to the manifold (8). There is.

The tube piping 00) connected between the coating agent supply piping (7) and the color changing valve (9) applies the coating agent that is not discharged from the coating machine (5) by switching the color changing valve (9). It is connected to a tube piping 03) connected to a coating agent return conduit θ which returns to the agent supply source (1).

In addition, a manifold (8) with a color change valve (9) attached is also included.
) and the coating machine (5).
1) is connected to a trigger valve ring that opens and closes in conjunction with the operation of starting and stopping the coating machine (5).

In addition, the manifold (8) includes a color change valve (9) that supplies a coating agent of another color, and a valve (not shown) that remains in the tube piping (10) and the coating machine (5) when changing colors. A solvent supply valve and an air supply valve are attached to supply a cleaning solvent and cleaning air to remove the coating agent.

A regulator (4) is connected to the coating agent supply pipe (7).
) and the metering pump (6) are provided, and 0 bypass pipes are provided to bypass the part where the metering pump (6) is installed.

This bypass piping θ includes a regulator 06) that directly supplies the coating agent pumped from the coating agent supply source (1) to the coating machine (5) at a predetermined high pressure according to the discharge amount, and a coating machine (5). ) is activated at the same time as the applicator (5) starts, and is temporarily opened until the applicator (5) starts discharging the applicator at a predetermined amount. There is.

The above is an example of the configuration of the coating agent supply mechanism according to the present invention, and the operation thereof will next be explained with reference to FIG. 2.

While the coating agent of the previous color supplied to the color change valve (9) is being discharged from the applicator (5), it is supplied to the color change valve (9) by the metering pump (6) which is rotated at low speed on standby. The coating agent of the next color to be applied is circulated from the tube pipe 03) to the coating agent supply source (1) through the coating agent return line 02).

When stopping the supply of coating agent from the color change valve (9) and changing the color to the next color coating agent, first, the solvent supply valve and the air supply valve (both of which are attached to the manifold (8)) should be stopped. (not shown) are alternately opened and closed to wash and remove the coating agent of the previous color remaining in the manifold (8), tube piping (11), and coating machine (5).

Next, when the applicator (5) is started, the color change valve (9) that supplies the next color coating agent switches from the tube piping θ side to the tube piping (11) side, and at the same time, the trigger valve circle opens. Then, the blow valve θ installed in the bypass pipe (15) is temporarily opened, and the coating agent supply source (
The coating agent that is pressure-fed from 1) through the coating agent feed pipe (3) is directly delivered to the coating machine (5) at a predetermined high pressure according to its discharge amount through the regulator 06) installed in the bypass piping (15). (T, in Figure 2).

As a result, the coating agent of the next color is instantly filled from the inside of the tube piping to the inside of the coating machine (5), and at the same time, it is sprayed at a predetermined amount from the coating machine (5), so that The cleaning solvent remaining in the inside (middle) is completely squeezed out and removed, and the discharge status of the next color coating material can be confirmed.

When the discharge amount of the coating agent reaches a predetermined value, the blow valve θ is closed and the bypass pipe θ■ is shut off, and at the same time, the color change valve (9) and trigger valve θ4 are temporarily closed, and then When the coating machine (5) is started, the trigger valve θ4 and the color change valve (9) are opened, and at the same time, the metering pump (6) installed in the coating agent supply pipe (7) is activated according to the discharge amount of the coating agent. The coating machine (5) then discharges the coating agent at a predetermined rate and starts painting (the second
Figure'rz).

〔Effect of the invention〕

As described above, according to the present invention, the coating agent is immediately filled into the coating machine at the same time as the coating machine is started,
Since the required amount of coating agent can be quickly started, it is possible to reliably prevent insufficient coating at the start of painting and improve the quality of the coating. This has the very valuable effect of being able to significantly shorten the time required to change colors from the end of painting to the start of painting the next color paint.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing an example of a coating agent supply mechanism according to the present invention, and FIG. 2 is a time chart showing its operation. Explanation of symbols (1) - Coating agent supply source, (4) - Regulator, (5
)--Coating machine, (6) Fixed amount pump, (7)--Coating agent supply piping, (+53--Bypass piping, 07)--Small blow valve. Patent applicant Trinity Industries Co., Ltd.

Claims (1)

[Claims] The coating agent pumped from the coating agent supply source (1) is transferred to the coating machine (5).
) is provided with a regulator (4) for adjusting the pressure of the coating agent, and a coating agent whose pressure is regulated by the regulator (4) is supplied to the coating agent supply pipe (7) at a predetermined flow rate according to the discharge amount. In a coating agent supply mechanism in which a metering pump (6) for supplying to a coating machine (5) is interposed, the regulator (4) and metering pump (6) are connected to the coating agent supply pipe (7).
Bypass piping (15
) is provided in the bypass piping (15), and the bypass pipe (15) is temporarily operated until the applicator (5) starts discharging the coating agent at a predetermined amount. A coating agent supply mechanism characterized by being equipped with a quick blow valve (17) that is opened automatically.