JP3116737U - Switching valve for cleaning the paint supply path - Google Patents

Abstract

【Task】
The present invention eliminates the troublesomeness at the time of cleaning by switching the flow path of the cleaning liquid in the cleaning such as color change in the paint supply path to the coating spray gun.
[Solution]
A passage connected to the cleaning liquid container, the paint container, and the supply pump, a stator provided with a connection hole communicating with each of the passages and opening on the same circumference, and the circumference on the circumference matching the same circumference A rotor provided with an arc-shaped groove communicating two adjacent connection holes among the connection holes is combined so that the opening and the groove coincide with each other, and a valve in which the adjacent connection holes are switched by rotation of the rotor is configured.
[Selection] Figure 1

Description

The present invention relates to a switching valve capable of efficiently performing a cleaning operation when cleaning a paint supply line by color change or the like in a paint line supplying paint to a spray gun for painting.

When painting with a spray gun industrially, many provide paint supply lines, supply the necessary paint determined by the paint specifications with a pump, etc., and replace the paint if the paint specifications change. It will be painted again. In this case, it is necessary to discharge the paint used so far, clean the entire supply path with the cleaning liquid, and then supply a new paint to be used.

In these cleaning operations, it is natural that the painting operation is interrupted, the operator switches the flow of paint and cleaning liquid / thinner, and the entire supply path from the suction port placed in the paint in the paint container to the spray gun via the pump Need to be cleaned. After discharging the paint used in normal equipment, the paint supply container is replaced with a cleaning liquid container such as thinner, and the entire paint passage is cleaned through the cleaning liquid. After that, another paint is connected again and used.

In facilities where paint changes are scheduled regularly or frequently in advance, in most cases, the supply route is fixed or connected to each device due to the complexity of the work. In general, a cleaning liquid supply path is prepared, and a paint supply path to be used is switched to use paint and cleaning separately by a switching valve.

Depending on the number of types of paint to be changed, the paint container side is prepared, and the paint path to the switching valve may be exchanged. In this case, the cleaning liquid is configured to wash the downstream of the switching valve. It is uneconomical in terms of equipment to be equipped with only the change accompanying the change of the above, and eventually the paint container side needs to be cleaned, so cleaning the upstream side of the switching valve, that is, the paint suction side, It cannot be avoided as a method of cleaning through the cleaning liquid from the paint inlet. This cleaning is performed by flowing a cleaning liquid from the suction side to the spray gun, and the switching valve is in one direction to send paint or cleaning liquid to the spray gun side.

In addition, it is usually advantageous in terms of equipment and maintenance to use the necessary equipment such as pumps in the paint supply route, and it is required to use them as much as possible. In some cases, a pump for supplying paint is used. However, it is generally necessary to increase the cleaning effect by flowing a large amount of cleaning liquid in comparison with the paint, and it cannot be said that the use of the paint supply pump is suitable.

On the other hand, when accuracy is required in the supply amount of paint, a gear pump is often used as the supply pump. In this case, the supply amount of the paint is limited, and if a large amount of cleaning liquid is flowed, it is difficult to shorten the service life and shorten the cleaning time because of the durability of the pump. Accordingly, the work is interrupted for a long time, and there arises a problem that productivity is lowered.

As described above, using the paint supply pump to flow the cleaning liquid in the same way as supplying paint has problems in reducing the load on workers and improving productivity by shortening the cleaning time, and in particular, cleaning the paint suction side. Need to be improved so that it can be easily performed with simple equipment and operation.

The purpose of the present invention is to facilitate the cleaning of the entire area of the paint supply line, so that the cleaning liquid can be supplied from the pump to the spray gun for cleaning, and the same cleaning liquid can also be supplied to the suction side of the paint container for cleaning. A switching valve is provided. The switching valve can be operated with a single valve, which can be operated with a single touch, eliminating mistakes and complications, and reducing the burden on the operator, leading to improved productivity in painting operations. It is something to try.

A switch valve connected to the cleaning liquid container is provided between the paint supply pump and the paint container in the paint supply path, the switch valve is provided with a passage connected to the cleaning liquid container, the paint container, and the supply pump, respectively, A stator provided with a connection hole that communicates with the passage and opens on the same circumference, and an arc-shaped groove that communicates two adjacent connection holes among the connection holes on a circumference that coincides with the same circumference. A rotor is combined so that the opening and the groove coincide with each other, and a valve in which the adjacent connection holes are switched by rotation of the rotor is configured.

The discharge side has a passage connected to the inlet side of the pump connected to the spray gun, the paint suction passage side connected to the paint container, and the passage side connected to the cleaning liquid / thinner, and any two of these passages The paint valve side and the pump side are connected at the time of painting, and the paint is supplied to the spray gun, and when cleaning, the cleaning liquid side and the pump side are connected by switching. The cleaning liquid is washed from the pump to the spray gun supply path, and further switched so that the cleaning liquid side and the paint container side are connected to each other so that the cleaning liquid can be sent to the suction side of the paint container and the paint suction passage on the container side can be cleaned.

These switching operations can be performed with one touch by the rotation of the lever. Since the passages other than the connection passage do not communicate with each other at the time of switching, the switching can be surely performed. Previously, the paint that had been sent to the pump from the paint container was shut off by switching, and the cleaning liquid was sent to the pump side for cleaning, and there was no separate switching valve that sent the cleaning liquid back to the pump suction side. A single switching valve enables cleaning of each part with a simple operation. Therefore, it is possible to save the labor of color change and cleaning as before, and to increase productivity.

As shown in FIG. 3, a typical example using the switching valve of the present invention is that the switching valve 1 includes a paint container 2 on the paint suction side, a cleaning liquid container 3 on the cleaning liquid supply side, and a paint pump 5 on the paint supply side to the spray gun. It is provided at a position connected to each. The outlet side of the pump is connected to the spray gun 4 for painting. In the case of this embodiment, the cleaning liquid container is a pressurized tank type pressure feeding container, and is provided with an air source 6 for pressurization. The implementation is not limited to this example, and a plurality of paint containers may be connected.

FIG. 1 shows the structure of the switching valve 1 of the present invention as a partial sectional view. The valve body 10 is provided with a rotor 13 which is cylindrical and rotates inside, and the rotor 13 is configured to be rotatable by a shaft 12 fixed to an external shaft handle 11. In the structure according to the illustrated example, a rotor receiver 14 is fixed to the lower end of the shaft 12, and the rotor 13 can be rotated by engaging a pin 18 so as to rotate integrally with the rotor receiver 14. The rotor 13 itself is made of a fluorine-based resin having lubricity and sealing properties, and two arc-shaped grooves 28 are provided on the lower surface as shown in FIG.

In addition, a spring 17 is inserted so that the rotor 13 is pressed downward, and the rotational resistance between the thrust bearing 15 and the inner surface of the valve body 10 is reduced to reduce the rotational resistance caused by the pressing, thereby ensuring the rotational position accuracy. The bearing 16 for carrying out is incorporated.

The valve body 10 is fixed to the stator 20 with a set screw 23 with a spacer 24 interposed therebetween. The stator 20 is provided with three connection ports 22 on the outer peripheral portion, and each connection port 22 communicates with a passage 21 that opens on the upper surface that contacts the rotor. These passages 21 are provided at equal intervals on the same circumference as the grooves 28 provided on the lower surface of the rotor, that is, at intervals of 120 °.

Therefore, when the rotor is rotated, the groove 28 always rotates on the opening of each passage 21. The O-ring 19 disposed outside the opening is provided to prevent leakage from the passage 21 to the outside. However, as described above, the rotor 13 is made of a material having a sealing property, so that the groove is formed in close contact with the stator 20. The passage 21 communicated at 28 and the blocked passage are structured to prevent leakage.

As shown in FIGS. 2A, 2B and 2C, the connection ports communicating with the respective passages are connected to the passage 21A connected to the paint container, the passage 21B connected to the cleaning liquid, and the passage 21C connected to the inlet of the supply pump. As for the communication relationship, the paint container 2 and the supply pump 5 communicate with each other for coating, the cleaning liquid container 3 and the supply pump 5 communicate with each other for cleaning the pump 5 and the spray gun 4 side, and the cleaning liquid. It is possible to switch to a state in which the container 3 and the paint container 1 side communicate with each other and the paint suction passage is cleaned.

In the case of the present embodiment, a gear pump is used in order to obtain an accurate amount of paint to be supplied with a structure in which the paint in the paint container is sucked up and sent to the spray gun by a pump at the time of painting. Further, as described above, the cleaning liquid is supplied by the thinner pressurized by the pressurized tank system through the switching valve 1 to the spray gun. At this time, the gear pump has a bypass passage by pressurization input, and has a structure that allows a larger amount of liquid to flow than during normal operation, so that the paint path to the spray gun can be cleaned in a short time.

Furthermore, the cleaning liquid can be made to flow in the direction opposite to the direction of painting through the switching valve 1 to the paint container side by the switching valve operation, and the suction passage side can be easily cleaned, and the paint supply pump is low. Cleaning in a short time is possible without efficient cleaning. Further, it can be understood that a pressure feeding device by pressure supply dedicated to cleaning can be employed, and by supplying flushing air between the cleaning liquids, it is possible to perform cleaning with less cleaning liquid in a shorter time.

For the positioning in the switching of these connection positions, for example, as shown in FIG. 1, a structure that is fixed when the ball 26 pressed by the spring 25 is fitted in the groove 27 provided in the shaft 12 is adopted. This type of positioning mechanism is selected from existing technologies and is not limited to this example.

It is a half sectional view showing the structure of the switching valve of the present invention. The schematic diagram which shows the positional relationship of the groove | channel which connects the channel | path inside a valve | bulb, and each channel | path. The connection diagram which shows the relationship with the other apparatus at the time of connecting a switching valve to a paint supply line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switching valve 2 Paint container 3 Cleaning liquid container 4 Spray gun 5 Supply pump 6 Air source 10 Valve body 11 Handle 12 Shaft 13 Rotor 14 Rotor receiver 15 Bearing 16 Thrust bearing 17 Spring 18 Pin 19 O-ring 20 Stator 21A, 21G, 21S passage 22A, 22G, 22S Connection port 23 Set screw 24 Spacer 25 Spring 26 Ball 27 Locking groove 28 Groove

Claims (1)

A connection port connected to the suction passage side connected to the paint container, the cleaning liquid supply side and the paint supply side connected to the spray gun, and a stator provided with a passage communicating with each of these connection ports and opening on the same circumference; A rotor provided with an arc-shaped groove that communicates two adjacent passages among the connection holes on a circumference that coincides with the same circumference is combined so that the opening passage and the groove coincide with each other. A switching valve configured to block other passages when the adjacent passages are connected.

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