JPH0576554U - Paint waste liquid recovery device - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents the leakage of coating liquid waste. [Constitution] Inner tank (11) and discharge hose (13)
The bypass hose (31) communicates with the downstream side portion of the check valve installed position, and a negative pressure is provided on the downstream side of the check valve installed position of the discharge hose (13) in the middle of the bypass hose (31). The valve device (41) is provided to open the bypass hose (31) when it becomes low.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coating waste liquid recovery device. Specifically, it relates to a coating liquid waste collection device used for collecting and recycling coating liquid waste generated by color change cleaning or coating machine cleaning in an automobile coating booth.

[0002]

[Prior Art]

 FIG. 3 is a diagram showing a schematic configuration of a conventional coating waste liquid recovery device.

For example, an automobile coating booth is generally equipped with a coating waste liquid recovery device. The conventional coating waste liquid recovery device collects the coating waste liquid discharged from the coating machine 7 into the tray 3 in the coating booth 2 at the time of color change cleaning by the air suction to the collection tank 4 in the booth 1 and then the booth 1 It is generally configured such that it is sent to an external recovery tank 6 or the like, where the thinner component is extracted and separated, and sent to the preparation chamber for reuse, and the other is discharged to the waste liquid tank.

However, the above waste liquid recovery apparatus requires two types of tanks, a collection tank 4 and a recovery tank 6, so that the equipment becomes large, and the pipe 5 between the tanks 4 and 6 is clogged. It occurs relatively often and requires a considerable number of days to repair.

Therefore, in order to eliminate the above-mentioned inconvenience, the present applicant attaches the inner tank 11 for collecting the coating waste liquid to the inner side of the outer tank 12 as shown in FIG. 4 and FIG. A coating waste liquid recovery device having a structure in which the tank 11 is hermetically sealed and a discharge pump 14 is assembled has been previously proposed.

More specifically, the coating waste liquid recovery apparatus includes a recovery tank 10 including an inner tank 11 and an outer tank 12, a recovery tank 10 and an appropriate place below (eg, a mixing room 8 at a lower floor). A discharge hose 13 communicating with the discharge hose 13, a discharge pump 14 provided in the middle of the discharge hose 13, and a check valve 15 opened by the pump pressure. The discharge pump 14 is operated to collect and discharge the coating waste liquid to an appropriate place (blending chamber 8).

Here, the inner tank 11 is a cylindrical tank having a bottom opening 11 a attached inside the outer tank 12. To the inner tank 11, a dump hose 52, one end of which is connected to the color switching device 9, a collection hose 53, one end of which is connected to the tray 3 are connected. Further, the inner tank 11 is connected to a deaeration means (not shown) via a deaeration pipe 19 so that the inside of the tank 11 is decompressed. Therefore, the coating waste liquid sent from the color switching device 9 and the tray 3 is collected in the inner tank 11 by the depressurizing action.

Further, the outer tank 12 has a discharge port 12 a arranged at a position lower than the bottom opening 11 a of the inner tank 11, and a discharge hose 13 is connected to the discharge port 12 a, and the discharge hose 13 is connected through the hose 13. It communicates with the lower mixing chamber 8.

A liquid level detection device 21 is provided in the outer tank 12. The liquid level detection device 21 is a float type liquid level detection device, and is composed of a float 22, a detected body (magnet piece) 23, a detection sensor (magnetic sensor) not shown, and the like. In FIG. 5, h1 indicates the upper limit liquid level of the coating waste liquid in the recovery tank 10, and h2 indicates the lower limit height of the waste liquid. The liquid level of the coating waste liquid in the recovery tank 10 is set to a predetermined level between the upper limit (h1) and the lower limit (h2) (the detected body 23 of the liquid level detection device 21 is at the same level as the circulating position). Face controlled.

With this configuration, the piping between the tanks as in the conventional case is not required, and not only the device is downsized, but also clogging and failure are eliminated.

[0011]

By the way, in the above-mentioned coating waste liquid recovery apparatus, when the negative pressure is generated on the downstream side of the check valve 15 position of the discharge hose 13 for some reason, the discharge pump 14 is driven. Although it does not move, the painting waste liquid may be discharged from the outer tank 12 due to the siphon effect. When such a phenomenon occurs, the coating waste liquid collected in the inner tank 11 vigorously flows into the outer tank 12 and is jetted up, causing a portion of the upper portion of the tank 12 with insufficient sealing (for example, the liquid level detection device 21 and the outer tank). There is a risk of leaking from the connection part with the tank 12) and polluting the surrounding area.

In view of the above circumstances, an object of the present invention is to provide a coating waste liquid recovery device capable of preventing the coating waste liquid from leaking out of the recovery tank.

[0013]

[Means for Solving the Problems]

 The paint waste liquid recovery device according to the present invention comprises a recovery tank including an inner tank to which a dump hose, a recovery hose, etc. are connected and an outer tank provided with a liquid level detection device, and the recovery tank and an appropriate place below. Includes a communicating discharge hose, a discharge pump provided in the middle of this discharge hose, and a check valve that opens due to pump pressure, and operates the discharge pump when the liquid level in the recovery tank reaches a specified level. A paint drainage recovery device configured to collect and discharge paint wastewater in a proper place, wherein the inner tank and a portion of the hose downstream of the check valve installation position are connected by a bypass hose, and the bypass hose is connected. It is characterized in that a valve device is installed which opens when the negative pressure on the downstream side of the check valve installation position of the discharge hose becomes halfway.

[0014]

[Action]

 According to the present invention having the above-described configuration, when a negative pressure is provided on the downstream side of the check valve installation position of the discharge hose, the bypass hose is opened by the valve device, and the downstream side and the inner tank communicate with each other through the bypass hose. It becomes the same pressure. Therefore, the coating waste liquid collected in the inner tank will not forcefully enter the outer tank and spout out, preventing the coating waste liquid from leaking out from the location where the ceiling on the outer tank is insufficient. To be done.

[0015]

【Example】

 FIG. 1 is a diagram showing a main part of an embodiment of the present invention, and FIG. 2 is a diagram showing an overall configuration of the present coating waste liquid recovery device. As shown in FIGS. 1 and 2, the coating liquid waste collecting apparatus according to the present embodiment is provided with a tray 3, a collecting tank 10 (inner tank 11, outer tank 12), a discharge hose 13, a discharge pump 14, a check valve 15 and a book. It is configured to include a bypass hose 31 and a valve device 41, which are characteristic parts of the device. The same components as those shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the bypass hose 31 is a means for connecting the inner tank 11 and a portion of the discharge hose 13 on the downstream side of the check valve 15 installation position.

Further, the valve device 41 is mounted in the middle of the bypass hose 31, and opens the hose 13 when the pressure downstream of the check valve 15 of the discharge hose 13 becomes negative. It is configured. In this embodiment, the valve device 41 includes a check valve 42 and a pressure adjusting valve 43. The valve device 41 (pressure adjusting valve 43) is configured to be pressure-controlled by the control device 45 so that high pressure is not applied to the discharge hose 13 side from the inner tank 11 side.

A check valve 16 is provided at a portion of the discharge hose 13 downstream of the check valve 15 in order to prevent backflow of the coating waste liquid more effectively.

Next, the operation will be described. When negative pressure occurs in the discharge hose 13 downstream of the check valve 15 position, the bypass hose 31 is opened by the valve device 41, and the downstream side of the discharge hose 13 and the inner tank 11 passes through the bypass hose 31. They are connected and have the same pressure.

Therefore, the coating waste liquid collected in the inner tank 11 does not vigorously enter the outer tank 12 and blow up, and a portion (for example, the liquid It is possible to prevent the coating waste liquid from leaking out from the surface detection device 21 and the upper part of the outer tank 12).

When the discharge pump 14 is operated and the coating waste liquid is sent to the lower mixing chamber 8 via the discharge hose 13, the bypass hose 31 is closed by the check valve 42 of the valve device 41. Therefore, it does not return to the inner tank 11.

Therefore, according to this embodiment, the inner tank 11 and the portion of the discharge hose 13 on the downstream side of the position where the check valve 15 is installed are communicated with each other by the bypass hose 31, and the reverse hose is provided in the middle of the bypass hose 31. Since the valve device 41 for opening the bypass hose 31 is provided when the downstream side from the position where the stop valve 15 is installed has a negative pressure, the coating waste liquid collected in the inner tank 11 is stored in the outer tank 12. It is possible to prevent the coating waste liquid from leaking to the outside of the recovery tank 10 because it does not forcefully enter and blow up.

Further, since the bypass hose 31 and the valve device 41 cooperate to eliminate the pressure imbalance between the inner hose 11 and the portion of the discharge hose 13 downstream of the check valve 15 interposed position, The structure does not become complicated or large.

[0024]

[Effect of the device]

 According to the present invention, the inner tank and the portion of the discharge hose downstream of the check valve installed position are connected by the bypass hose, and a negative pressure is provided in the middle of the bypass hose on the downstream side of the check valve installed position. In the event of a spillage, the valve device that opens the bypass hose is provided.Therefore, the coating waste liquid collected in the inner tank will not forcefully enter the outer tank and spurt out, and will not be discharged outside the collection tank. It is possible to prevent the coating waste liquid from leaking.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing an overall configuration of the present coating waste liquid recovery device.

FIG. 3 is a diagram showing a schematic configuration of a conventional coating waste liquid recovery device.

FIG. 4 is a diagram showing a schematic configuration of a coating liquid waste recovery device having a recovery tank including an inner tank and an outer tank.

FIG. 5 is a diagram for explaining a recovery tank of the coating waste liquid recovery device of FIG.

[Explanation of symbols]

 10 Recovery Tank 11 Inner Tank 12 Outer Tank 13 Discharge Hose 14 Discharge Pump 15 Check Valve 21 Liquid Level Detector 31 Bypass Hose 41 Valve Device

Claims (1)

[Scope of utility model registration request] 1. A recovery tank comprising an inner tank to which a dump hose, a recovery hose and the like are connected and an outer tank provided with a liquid level detection device, and a discharge hose which connects the recovery tank and a proper place below. Includes a discharge pump provided in the middle of this discharge hose and a check valve that opens by pump pressure.When the liquid level in the recovery tank reaches a specified level, the discharge pump is operated to collect the coating waste liquid in the proper place. A coating waste liquid recovery device formed to discharge, wherein the inner tank and a portion of the discharge hose downstream of the check valve installation position are connected by a bypass hose, and the discharge hose is connected in the middle of the bypass hose. A coating waste liquid recovery device equipped with a valve device that opens when a negative pressure is generated on the downstream side of the check valve installation position.