JPS60172374A - Spray painting equipment - Google Patents

Abstract

PURPOSE:To maintain high performance in removing a paint mist, and to reduce sharply the power needed for ventilation by providing plural throttling flow passages in parallel with an air discharging passage, and passing selectively the gaseous discharge. CONSTITUTION:The number of exhaust fans 7 to be operated is controlled to control the amt. of air to be ventilated on the discahrge side, and the number of the second throttling flow passages 14 is accordingly increased as the amt. of air to be ventilated is increased. Consequently, the pressure difference between the upstream side and the downstream side of the second flow passage 14 can be continuously maintained in spite of the change in the amt. of air to be ventilated at a value wherein the second throttling flow passage 14 is most efficiently operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment for spray painting automobile bodies and home appliance cushioning, and more specifically, the present invention is provided with a work device for spray painting objects to be painted indoors, and removes excess spray paint from the interior. Provided with a ventilation device that can freely change the air volume to eliminate mist, and provided in the exhaust path of the ventilation device with a paint mist removal device having a flow path that causes the passing exhaust gas to collide with the cleaning water;
By using the description of the inertial mass of the exhaust gas and the paint mist contained therein when the exhaust gas is passed through the flow path of the throttle 9 at high speed, the contained paint mist is removed as the exhaust gas collides with the cleaning water. Concerning spraying equipment that separates and removes paint mist from exhaust gas by trapping it in washing water
To configure the FGP flow path, one or more throttle flow paths are interposed in the exhaust path so that the exhaust gas always passes through them, and the effective cross section of the FGP flow path is 1Jli8t, and the ventilation air volume is the design air volume ( (constant), so that the throttle channel is in the most efficient operating state, that is, as shown in Figure 5.
The mist removal efficiency (goods) is close to the upper limit value (Mmax), and the pressure difference (Δp) between the upstream and downstream sides of the throttle channel is kept as small as possible ( Δpa), thereby achieving both paint mist removal efficiency and power efficiency during continuous ventilation operation at a constant design air volume.

However, in order to further reduce the power consumption of the ventilation system from the point of view of energy conservation, as shown in Figure 4 (a) and (b), ventilation is controlled according to changes in the amount fGl of surplus spray paint mist in the spray painting room. When the air volume (Ql) is changed within the range where the design air volume is the maximum value, the pressure difference (Δp) between the upstream side and the downstream side of the throttle channel changes, and the paint mist removal efficiency increases accordingly. There was a problem with the paper.

An object of the present invention is to make it possible to control the ventilation air volume while maintaining high paint mist removal performance and suppressing an increase in pressure loss in the constriction flow path through rational improvements.

The characteristic configuration of the spray coating equipment according to the present invention is that a plurality of restrictive flow paths are provided in parallel with the exhaust path, and a flow path selection device selects one of the nine restricted flow paths through which the exhaust gas passes. The functions and effects are as follows.

It is possible to change the total effective passage cross-sectional area of the restrictor flow path according to the ventilation air volume by selection operation using the flow path selection device. The pressure difference (Δp) between the upstream side and the downstream side of
As shown in the figure, the pressure difference (Δp) resulting in pressure loss is as small as possible, and the mist removal efficiency (goods) is the upper limit (Mm
ax) can be maintained at a value (Δpa) close to

As a result, while maintaining high paint mist removal performance and suppressing pressure loss in the restrictor flow path, it is possible to control the ventilation air volume according to the amount of paint mist in the room, reducing the power required for ventilation. It has now been possible to significantly reduce this.

Next, embodiments will be described based on the drawings.

As shown in FIG.
1+ are provided in parallel, and each of the painting rooms fl) and 1liil post-processing sections (a) and (b) are connected by a conveyor (2) for conveying the object to be coated.

As shown in FIGS. 2 and 8, the sprayer (2) constitutes the painting room fi+, and the spray gun (3) is used while the object to be coated brought in by the conveyor (2) is stopped at a predetermined position indoors. Renovated articulated painting robots (3) that paint by spraying paint from 8A) are installed on both sides of the conveyance path, and each painting robot (3) paints by spraying paint from 8A). 3) A program controller (4) is provided which automatically performs the opening operations such as starting and stopping the spraying operation, changing the spraying position, and changing the direction of the spraying all at once.

Then, there is an air supply fan (6) that blows ventilation air downward from a filter-mounted Suita port (5A) installed over almost the entire ceiling of the spray painting room ill, and an iron grate that covers the entire surface of the spray painting room ill. A plurality of exhaust fans (7) are provided to forcibly exhaust the indoor air from the formed floor (6).
The blower constitutes the ventilation system (5), (7) that removes excess spray paint mist generated during painting from the room together with the exhaust air, and the exhaust system path (11) of the ventilation system (5), (7). During the process, the paint mist contained in the exhaust gas is removed by the cleaning water (Wl) as the exhaust gas collides with the cleaning water (W□), (Wl) by utilizing the inertial mass of the exhaust air and the paint mist. , (Wl), the first and second mist removal devices +8+ and +91 are interposed in series.

gtj No. 1 mist removal device (8) removes overflow water (WlO) from the No.
) and a first constriction flow path (11) that allows the exhaust gas to pass vertically toward the lower blade while flowing down along the inner circumferential surface;
The first recovery water tank +1 in which the high-speed discharged exhaust gas from the first constriction channels (l) collides with the water surface of the stored washing water (Wl) and the contained paint mist is captured in the stored washing water (Wl).
2).

Further, in configuring the second mist removing device (9), a first
A parallel exhaust path (r) that separately conducts exhaust gas from the mist removal device (8) to the exhaust fan (7) in a divided state.
At the same time, a second cleaning water circulation tank V field that receives the diverted exhaust gas on the water surface, and a second cleaning water circulation tank (13
) A second constriction flow path circle 1 that allows the branched exhaust gas to pass through the bent path while flowing down overflow water (W2) from the second constriction flow path 041, and a $2 recovery water tank 5 that receives the flow down from the second constriction flow path 041.
) are installed in each parallel exhaust path (r), so that
When passing along the curved route, the diverted exhaust gas is applied to the downstream cleaning water (W2), and the centrifugal action at that time causes the contained paint mist to be captured by the downstream cleaning water (W2).
i4L, temeru.

In the figure, the reference numeral ``-'' denotes a sieve plate that doubles the high-speed discharged material from the second constricted flow path H and causes paint mist to be captured more effectively in the accompanying flowing washing water (W2).

The air supply fan (5) and the exhaust fan (7) are controlled to control the rotation speed of the air supply fan (5), and the exhaust fan (7) is driven by a drive base to control the air supply and exhaust air inside the painting room. A fan controller 97) is provided to change the air volume of both fans (5) and (7), that is, the ventilation air volume to the room while maintaining the balance, and the painting robot (3)
Group spraying is determined by changing the amount of indoor surplus spray paint mist (Gl) from the program controller (4) as shown in FIG. Based on the robot's pre-operation status information, and based on the detection results, the ventilation air volume (Q) is adjusted to reduce the indoor surplus air blow Ivl' paint mist amount fG) as shown in Figure 4 (b). A control device (1@) is provided to self-helply issue an air volume control command to the fan controller Oη in order to change the air volume accordingly, thereby maintaining the indoor environment while reducing the amount of assistance required for ventilation. In addition, when performing the above ventilation air volume control, the exhaust side is controlled by the exhaust fan (7), thereby controlling the flow rate of the second constriction through which the exhaust gas passes through. By setting the height as tQl increases, the pressure difference (Δp) between the upstream side and the downstream side of the second throttle flow path (14J) can be adjusted to the highest level regardless of changes in ventilation air volume. The value (Δpa) that provides an efficient working state, that is, as shown in Fig.
It is possible to maintain the vertical sail at a value (Δpa) that makes the paint mist removal rate (1lJJ rate) close to the upper limit value (Mmax) by the throttle flow path (14), thereby reducing The ventilation air volume control layered in the second throttle channel Q
In addition, the mist removal performance of the second mist removal device (9), which is the final paint mist removal process, is still maintained. It is structured so that it can be done while

I will explain the example of a divorced husband.

Among the gradients of the second throttle flow path, the one through which the exhaust gas passes is selected.The second throttle flow 1+I! Instead of controlling the exhaust fans (7) separately connected to 011, a second throttle flow path is connected in parallel to one exhaust fan (7) whose air volume can be freely controlled. The exhaust gas supply to each of (14) may be configured to be intermittent by damper control, and the device that performs these selection operations is collectively referred to as a flow path selection device 97).

Further, instead of performing the above selection operation only on the second throttle channel (I4), it may also be configured to be performed on the parallel first throttle channel (11).

By selecting parallel restrictor channels for passing exhaust gas,
Regardless of changes in ventilation air volume, the pressure difference (Δp) between the upstream and downstream sides of the restrictor flow path (+4J) is maintained at an almost constant value (Δpa).
Parallel throttle flow path 04 through which exhaust gas passes while maintaining
) instead of selecting the throttle flow path 04) which has an effective passage cross section determined by the ventilation air volume tQl from among the parallel throttle flow paths 04) each having a different effective passage cross section. You can also make 8.

Ventilation devices (5) and (7) that can freely control the landscape and landscape are suitable for forced air supply only or forced exhaust only as long as the indoor exhaust air is forced to pass through the parallel throttle flow path 54). It's okay to do that.

Furthermore, instead of automatically operating the flow path selection device (17) as the ventilation air volume changes, the flow path selection device η may be configured to be manually operated.

The present invention is particularly effective for a stationary painting type painting equipment that paints objects to be coated that are not being transported in a painting room, but the blowing as a partition narrow space is particularly effective for painting equipment that uses a stationary coating method to coat objects to be coated that are not being conveyed in a painting room. It goes without saying that it can also be applied to painting equipment that uses a continuous painting method that paints while scraping.

[Brief explanation of the drawing]

The drawing shows an example of the spray painting equipment according to the present invention, and shows the first embodiment of the painting equipment.
The figure is a layout of the spray painting room, Figure 2 is a vertical cross-sectional view of the same, Figure 8 is a schematic ventilation route diagram, and Figure 4 (a) is a graph showing changes over time in the amount of indoor surplus spray paint mist (G). , Figure 4 (b)
FIG. 5 is a graph showing the historical state of the ventilation airflow rate (IQ), and FIG. 5 is a graph showing the correlation between the paint mist removal efficiency and the pressure (Δp) on the upstream and downstream sides of the throttle channel. (1)...room, (3)...work equipment,
(5), (7)... Ventilation equipment, (9)...
...Paint mist removal device, 1J4J... Throttle channel, (I7)... Channel selection device, prisoner...
・Object to be painted, (8)... Exhaust route, +01...
...Excess blowing is paint mist amount, IQ)...Ventilation air volume, (W2)...Washing water. Agent Patent attorney Kitamura Osamu 1 Figure] Acceptable 3151!1 Part 2 ■

Claims (1)

[Scope of Claims] ■ Work equipment for spray painting the shed to be painted in room+ll
F31 is installed, and a ventilation system that can freely change the air volume to remove excess paint mist from inside the room fl1 +51, t
A paint mist removal device (9) having a throttle p-flow I6α that causes the passing exhaust gas to collide with the cleaning water (W2) in the exhaust path (8) of the ventilation device +6), 17).
A blower provided with a paint mist removing device (9) is provided with a plurality of said constriction passages (14) arranged in parallel to said exhaust passage (8). , a spray coating equipment equipped with a flow path selection device for selecting which of these flow paths through which the exhaust gas is passed. (2) The flow path selection device η is replaced with the ventilation device (6). For (7), it is a mistake to spray excess paint) -m IGI
The ventilation air i of the ventilation devices (5) and (7) due to the increase in
The spray coating equipment according to claim 0, wherein the number of the throttling streams* (14) through which the exhaust gas passes increases as tfQ) increases.