JPS632221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning thinner recovery device that can recover as much of the cleaning thinner used to clean the paint gun when changing the paint color and can even reuse it as recycled thinner. It is.

Conventionally, in order to recover cleaning thinner used to clean the inside of a paint gun when changing paint colors in a topcoat booth, for example, it is stored in a vacuum tank via a relay tank installed in the middle of the recovery circuit, and then the recovered thinner is When a certain amount was reached, a transfer pump was used to send it to the collection drum.

However, this method has the following problems: (a) If there is even a slight gap in the tank seal of the vacuum tank, the necessary negative pressure cannot be obtained and cleaning thinner cannot be sucked out. While the recovered thinner is temporarily stored, the paint solids in the thinner settle and clog the tank outlet. (c) In order to sense the amount of thinner stored in the vacuum tank, An electrostatic sensitive level meter is attached to the vacuum tank that captures the amount of thinner through a glass tube that communicates with the bottom of the vacuum tank. (d) It is impossible to clean the recovery circuit, which consists of hoses such as Teflon tubes, without disassembling the hoses, which requires tens of hours per month to maintain the circuit. There were things I needed to do, etc.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a cleaning thinner recovery device at the time of color change, which improves the recovery rate and maintainability.

The present invention provides a recovery circuit from a hopper to a recovery drum for recovering cleaning thinner spouted from a paint gun, and a relay tank, a strainer, and a transfer pump are provided in sequence from the hopper to the recovery drum, and the cleaning thinner is collected in a recovery circuit from a hopper to a recovery drum. activating the transfer pump in conjunction with the spray from the paint gun to enable cleaning thinner to be collected in the collection drum;
The apparatus for recovering cleaning thinner at the time of color change is characterized in that a backwash circuit is connected to the upstream circuit of the strainer to send cleaning thinner from the thinner pipe connected to the paint gun to the recovery circuit.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in the figure, in a top coating booth (not shown) whose interior is partitioned into upper and lower chambers by a grating 1, cleaning thinner A is sprayed from an electrostatic coating gun 2 into the chamber above the grating 1. A hopper 3 for accommodating is provided, and a relay tank 4 provided in a chamber below the drainboard 1 is provided with a relay hose 5.
It communicates with the inside of the filter 6 in the hopper 3 via.

The relay tank 4 is connected via a relay hose 8 to a strainer 7 installed outside the booth. This strainer 7 is for removing paint contained in the cleaning thinner. A backwash circuit 10 is provided between a relay hose 8 near the strainer 7 and a thinner pipe 9 connected to the coating gun 2. This backwash circuit 10 includes a hose 1
1 and valves 12 and 13, and is used to clean the recovery circuit (hose) upstream and downstream of the strainer 7 with thinner sent from the thinner pipe 9.

A transfer pump 15 is provided downstream of the strainer 7 via a relay hose 14. The transfer pump 15 is in communication with a thinner blowing needle signal transmitter (not shown) attached to the paint gun 2 via a delay timer 16, and is connected to a thinner blowing needle signal transmitter (not shown) attached to the paint gun 2. It's starting to work. The relay hose 14 and the relay hose 8 between the strainer 7 and the joint of the backwash circuit 10 are each provided with valves 17 and 18 for opening and closing the circuit.

Then, a relay hose 1 is connected downstream of the transfer pump 15.
A collection drum 20 is disposed via 9.

Next, the operation of the cleaning thinner recovery device having the above structure will be explained.

When changing the paint color, thinner is sent from the thinner pipe 9 to the paint gun 2. The cleaning thinner A spouted from the coating gun 2 is collected in a hopper 3, and after foreign matter is removed by a filter 6, it passes through a relay hose 5 by gravity and accumulates in a relay tank 4. At the same time, a transmitter (not shown) on the painting gun 2 side
The needle signal emitted from the transfer pump 1
5 is activated, the cleaning thinner flows from the relay tank 4 through the relay hose 8, the paint is removed by the strainer 7, and passes through the transfer pump 15 to the collection drum 20.
sent to. In addition, when collecting cleaning thinner,
The backwash circuit 10 is disconnected from the relay hose 8 by a valve 12.

When cleaning the inside of the circuit of the recovery device, cleaning thinner is sent into the circuit of the recovery device from the thinner pipe 9 through the backwash circuit 10 by operating the valves 12 and 13 and the valves 17 and 18. .

The recovery rate of cleaning thinner using the above recovery device is 70
%, which is surprising compared to the recovery rate of about 4% in the conventional device in which a vacuum pump was interposed between the relay tank 4 and the transfer pump 15 in the illustrated example. In addition, in the conventional apparatus described above, the time required for maintenance to maintain the function of the apparatus was 20 hours/month, whereas in the apparatus of the present invention, the maintenance time can be reduced to 0 hours/month.

The present invention is a recovery device having the above-mentioned configuration, in which a relay tank and a transfer pump are connected through a strainer, and the transfer pump is operated in conjunction with the spraying of cleaning thinner from a paint gun. Therefore, the cleaning thinner that is ejected from the painting gun and collected in the relay tank can be directly transferred to the collection drum, and the solid content in the cleaning thinner can be removed using a strainer. Therefore, the cleaning thinner can be used as recycled thinner. The recovery rate can be greatly improved compared to conventional recovery equipment equipped with a storage tank. In addition, in the recovery device of the present invention, a backwash circuit connected to the thinner pipe for cleaning is provided in the recovery circuit, so the recovery circuit can be easily cleaned, and the maintainability of the device is significantly improved compared to the conventional device described above. can be improved.

Furthermore, it is preferable from the viewpoint of preventing environmental pollution by recovering the cleaning thinner with the apparatus of the present invention.

[Brief explanation of the drawing]

The figure is a schematic diagram showing one embodiment of the present invention. 2... Paint gun, 3... Hopper, 4... Relay tank, 7... Strainer, 9... Thinner piping, 10
...Backwash circuit, 15...Transfer pump, 20...Recovery drum, 5, 8, 14, 19...Relay hose (recovery circuit).

Claims (1)

[Claims] 1. In the recovery circuit from the hopper to the recovery drum for recovering the cleaning thinner ejected from the painting gun, a relay tank, strainer, and transfer pump are installed in order from the hopper to the recovery drum, and the cleaning thinner is removed from the painting gun. The transfer pump is operated in conjunction with the spouting of the paint so that the cleaning thinner can be collected in the recovery drum, and the upstream circuit of the strainer is supplied with cleaning thinner from the thinner piping connected to the painting gun to the recovery circuit. A device for recovering cleaning thinner at the time of color change, characterized by being connected to a backwashing circuit for sending it.