JPH0148827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment for spray painting automobile bodies and home appliance casings, and more specifically, a work device is provided for spray painting objects to be painted in a room, and excess spray paint mist is removed from the room. A ventilation system that can freely change the air volume is provided, and a paint mist removal device is provided in the exhaust path of the ventilation system, and the paint mist removal device has a throttle channel that causes the passing exhaust gas to collide with the cleaning water, and the exhaust gas passes through the throttle channel at high speed. Utilizing the difference in inertial mass between the exhaust gas and the paint mist contained therein, the paint mist contained in the exhaust gas collides with the cleaning water is captured in the cleaning water, and the paint mist is separated and removed from the exhaust gas. This invention relates to spray painting equipment designed to do the following.

Conventionally, in the above-mentioned spray painting equipment, when configuring the paint mist removal device, one or more throttle channels are interposed in the exhaust route so that the exhaust gas can pass through them at all times, and the effective passage of the throttle channel is interrupted. The area is set so that when the ventilation air volume is the design air volume (constant), the throttling channel is in the most efficient operating state, that is, as shown in Figure 5, the mist removal efficiency M is close to the upper limit value (Mmax). In addition, in order to suppress the increase in power consumption due to pressure loss, the pressure difference (Δp) between the upstream side and the downstream side of the throttle is set to the smallest possible value (Δpa). During ventilation operation, the aim was to achieve both paint mist removal efficiency and power efficiency.

However, in order to further reduce the power consumption of the ventilation system from the perspective of energy conservation,
As shown in (b), when the ventilation air volume Q is changed within the range that makes the design air volume the maximum value according to the change in the amount G of excess spray paint mist in the spray painting room, the upstream and downstream sides of the throttle flow path pressure difference (Δp)
There was a problem in that the paint mist removal efficiency was significantly reduced due to the change in the paint mist removal efficiency.

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 throttle channel through rational improvements.

The characteristic configuration of the spray painting equipment according to the present invention is that a plurality of throttle channels are provided in parallel with the exhaust route, and a flow path selection device is provided for selecting one of the throttle channels through which the exhaust gas passes. In particular, its actions and effects are as follows.

In other words, it is possible to change the total effective cross-sectional area of the throttle channel according to the ventilation air volume by selecting the channel selection device, so regardless of the change in ventilation air volume, the upstream side of the throttle channel The pressure difference (∆p) with the downstream side is set to a value that allows the throttle channel to operate in the most efficient state, that is, as shown in Figure 5, the pressure chamber (∆p) itself, which causes pressure loss, is kept as small as possible. , and the mist removal efficiency M is the upper limit (Mmax)
It is possible to maintain a value (Δpa) that is close to the current value.

As a result, paint mist removal performance is maintained at a high level,
In addition, it is possible to control the ventilation air volume according to the amount of excess sprayed paint mist in the room while suppressing the pressure loss in the throttle channel, and it has become possible to significantly reduce the power required for ventilation.

Next, embodiments will be described based on the drawings.

As shown in FIG. 1, a plurality of spray painting chambers 1 are provided in parallel between a pre-painting treatment section a and a post-treatment section b for drying and baking. Processing sections a and b are connected by a conveyor 2 for conveying objects to be coated.

To configure the spray painting room 1, as shown in FIGS. 2 and 3, the object to be painted A brought in by the conveyor 2 is stopped at a predetermined position in the room, and paint is sprayed from the spray gun 3A. A plurality of articulated painting robots 3 that paint by spraying are arranged on both sides of the conveyance path, and each painting robot 3 starts and stops the spraying operation and changes the spraying position based on a preset time schedule. , and a program controller 4 that automatically performs various operations such as changing the direction of spraying at once.

An air supply fan 5 blows and supplies ventilation air downward from a filter-attached outlet 5A provided over almost the entire ceiling of the spray painting room 1, and a floor 6 whose almost entire surface is made of iron gratings. A plurality of exhaust fans 7 are provided for forcibly exhausting indoor air from the air, thereby configuring ventilation devices 5 and 7 that remove surplus spray paint mist generated during spray painting from the room together with exhaust air, and the ventilation device In the middle of the exhaust system route R of Nos. 5 and 7, the difference in inertial mass between the exhaust air and the paint mist is used to remove the paint mist contained in the exhaust gas as the exhaust gas collides with the cleaning water W ₁ and W ₂ . First and second mist removing devices 8 and 9 are interposed in series to trap mist in the cleaning waters W ₁ and W ₂ .

The first mist removing device 8 includes a plurality of first mist removers that allow exhaust gas to pass vertically downward while causing overflow water _W1 from a first wash water circulation tank 10 provided below the floor 6 to flow down along the inner peripheral surface. A first constriction channel 11 and a first channel that causes the high-speed discharged exhaust gas from the first throttle channel 11 to collide with the water surface of the stored cleaning water W ₁ to capture the paint mist contained in the stored cleaning water W ₁ .
It is composed of a recovery water tank 12.

Further, in configuring the second mist removing device 9,
Parallel exhaust paths r are provided to separately conduct the exhaust gas from the first mist removal device 8 to the exhaust fan 7 in a divided state, and a second cleaning water tank ring tank 13 receives the divided exhaust gas on the water surface; 2. A second constricted flow path 14 that allows the overflow water W ₂ from the ring water tank 13 to flow down while allowing the branched exhaust gas to pass through the bent path, and a second recovery water tank 15 that receives the flow down from the second constricted flow path 14. are installed in each parallel exhaust path r, and when the air is blown along the curved path, the branched exhaust gas collides with the flowing washing water _W2 , and the centrifugal action at that time removes the contained paint mist from the flowing washing water. It is configured to be captured by W ₂ .

In the figure, reference numeral 16 denotes a collision plate for colliding the high-speed discharged matter from the second constricted flow path 14 and causing paint mist to be captured more effectively in the accompanying flowing washing water W ₂ .

The supply air fan 5 and the exhaust fan 7 are controlled by controlling the rotation speed of the intake fan 5 and by controlling the number of exhaust fans 7 driven, while maintaining the air supply and exhaust balance in the spray painting room. In addition, a fan controller 17 is provided to change the amount of air supplied to the room, that is, the amount of ventilation air into the room. The change in the indoor surplus spray paint mist amount G, such as A control device 18 is provided that automatically gives an air volume control command to the fan controller 17 to change the amount G of sprayed paint mist to match the change, thereby reducing the power required for ventilation while maintaining the indoor environment. It is configured to do so.

Furthermore, when controlling the ventilation air volume, the number of exhaust fans 7 driven on the exhaust side is controlled, thereby creating a second throttle flow path 14 through which the exhaust gas passes.
By increasing the number of pieces as the ventilation air volume Q increases, the second throttle flow path 1 is increased regardless of changes in ventilation air.
The pressure difference (Δp) between the upstream side and the downstream side of 4 is expressed as the second
The value (∆pa) at which the throttle channel 14 is in the most efficient working state, that is, the pressure difference (∆p) that causes pressure loss is as small as possible, as shown in Fig. 5, and
The paint mist removal efficiency M by the second throttle flow path 14 can be continuously maintained at a value (Δpa) close to the upper limit value (Mmax), and the ventilation air volume can be controlled according to the indoor surplus sprayed coating mist amount G. without increasing power consumption due to increased pressure loss in the second throttle flow path 14, and maintaining high mist removal performance of the second mist removal device 9, which is the final paint mist removal process. It is designed so that you can do it while

Next, another embodiment will be described.

When selecting which of the second throttle channels 14 allows the exhaust gas to pass, instead of controlling the number of exhaust fans 7 connected to each second throttle channel 14, substantially one air volume control is performed. Flexible exhaust fan 7
The exhaust gas supply to each of the second throttle channels 14 connected in parallel to each other may be configured to be interrupted by damper control, and the device that performs these selection operations is collectively referred to as a channel selection device 17.

Furthermore, instead of performing the above-mentioned selection operation only on the second throttle channel 14, the configuration may be such that it is performed also on the parallel first throttle channel 11.

By selecting the parallel throttle channel 14 through which exhaust gas passes, the pressure difference (Δp) between the upstream side and the downstream side of the throttle channel 14 can be maintained at a substantially constant value (Δpa) regardless of changes in the ventilation air volume. , instead of selecting the number of parallel throttle channels 14 through which exhaust gas passes, a throttle channel having an effective passage cross-sectional area corresponding to the ventilation air volume Q is selected from among the parallel throttle channels 14 each having a different effective passage cross-sectional area. 14 may be selected.

Further, the ventilation devices 5 and 7 that can freely control the air volume may be ventilators that only force air supply or force exhaust, as long as they force the indoor exhaust gas to pass through the parallel throttle flow path 14.

In addition, the flow path selection device 1
Instead of automatically operating the flow path selection device 17
It is also possible to configure it into a transaction type.

The present invention is particularly effective for stationary painting equipment that paints objects to be coated that are not being transported in a spray painting room as a partitioned space. Needless to say, the present invention can also be applied to painting equipment that uses a continuous painting method.

[Brief explanation of drawings]

The drawings show an embodiment of the spray painting equipment according to the present invention, in which Fig. 1 is a layout of a spray painting room, Fig. 2 is a vertical sectional view thereof, Fig. 3 is a schematic ventilation route diagram, and Fig. 4 A is a diagram of the interior of the room. A graph showing the change over time in the amount of surplus spray paint mist G. Figure 4 (b) is a graph showing changes in the ventilation air volume Q. Figure 5 is a graph showing the change in the ventilation air volume Q over time. It is a graph showing the correlation of paint mist removal efficiency M. 1... Room, 3... Work equipment, 5, 7... Ventilation system, 9... Paint mist removal device, 14... Throttle channel, 17... Channel selection device, A... Object to be painted, R
... Exhaust route, G ... Excess spray paint mist amount, Q
...Route air volume, W ₂ ...Washing water.

Claims (1)

[Scope of Claims] 1. A working device 3 is provided for spray painting the object A to be coated in the chamber 1, and ventilation devices 5 and 7 are provided that can freely change the air volume to remove excess spray paint mist from the chamber 1, The spray painting equipment is provided with a paint mist removing device 9 having a throttle channel 14 in which the passing exhaust gas collides with the cleaning water W ₂ in the exhaust route R of the ventilation devices 5 and 7, the paint mist removing device 9 , a plurality of the throttle channels 14 are connected to the exhaust route R.
The spray painting equipment is provided with a flow path selection device 17 that is provided in parallel with the flow paths 14 and selects the flow path selection device 17 that selects the flow path through which the exhaust gas passes among the throttled flow paths 14. 2. The flow path selection device 17 is connected to the ventilation device 5,
7, the number of the throttle channels 14 through which the exhaust gas passes is increased as the ventilation air volume Q of the ventilation devices 5 and 7 increases due to the increase in the amount G of excess sprayed paint mist. Spray coating equipment according to claim 1, which is associated with.