JPS6068084A - Removal of stuck scraps of paint - Google Patents

Abstract

PURPOSE:To remove easily paint scraps from a member to which the uncured paint scraps the stuck by conducting the hot air discharged from a furnace to said member to dry and cure the paint scraps then subjecting said member to a shot blasting or chipping treatment. CONSTITUTION:A material A to be treated such as sludge or the like is charged from a sludge feeder 2 into a rotary kiln 6. When the waste gas from the kiln 6 is introduced into a paint curing furnace 14, the paint scraps sticking in an uncured state to a member B is thoroughly dried and cured in 1-2hr, by which the paint scraps are denatured and brittled and easily removable. The paint scraps sticking to the taken out member B are hard and brittle. Said paint scraps are easily removed when the member is subjected to a shot blasting or chipping treatment. The removed paint scraps are charged into the kiln 6 and is thus utilizable as fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies to members such as drainboards and rails in painting equipment (
The present invention relates to a method for removing adhering paint debris that can easily remove uncured paint debris adhering to a member (hereinafter referred to as a member).

Generally, painting equipment is equipped with a painting room and a drying oven, and the painted object that has been spray-painted in the painting room is put into the drying oven to harden the paint.

However, the floor of the painting room is layered with members such as metal drainboards, and the remaining paint debris that did not adhere to the object to be painted remains soft and adheres to them without hardening. It grows each time it is painted.

For this reason, it is necessary to periodically remove the paint debris adhering to the member, but it is extremely difficult to remove it because it is soft and cannot be easily peeled off.

Conventionally, as a method for removing this type of adhering paint debris, a method has often been used in which the paint debris is transformed into sludge by boiling it with a caustic soda solution and then removed.

However, this method has the drawbacks of being extremely dangerous and requiring a great deal of labor.

Therefore, as a means to overcome the above-mentioned difficulties,
As described in Japanese Patent No. 15311, a method of incinerating paint waste using an auxiliary combustion burner is used in some cases.

However, this method also had the disadvantage that the parts were burned out due to the high temperature, and that it required auxiliary fuel of many π°.Also, after incineration, the adhered paint layer was removed with a brush, etc. However, it is difficult to completely remove the finely powdered paint chips, and when the treated parts are reused, the remaining paint chips tend to rise as dust.

The present invention was devised in view of the problem of slanting and to solve this problem, and its purpose is to at least dry the treated material such as sludge from the furnace and utilize the exhaust gas. To provide a method for removing adhering paint debris by thermally curing the paint debris adhering to the member without burning out the member, and by which the paint debris can be easily removed from the member.

The method for removing adhered paint debris of the present invention involves directing hot air discharged from a furnace to a member to which uncured paint debris has adhered, drying and hardening the paint debris adhering to the member, and then subjecting the hindlimb member to shot blasting. Another feature is that paint debris is removed from the member by chiseling.

For example, a treatment facility that processes sludge or the like includes at least a drying furnace that dries the processed material and a deodorizing furnace that deodorizes exhaust gas from the drying furnace.

High-temperature gas is introduced into the drying oven for auxiliary combustion, and the drying temperature is about 200
~300°C exhaust gas is discharged. Since the exhaust gas contains odor components from the processed material, it is introduced into a deodorizing furnace, auxiliary combustion is performed again, and the temperature is raised to approximately 700° C. or higher, thereby deodorizing the exhaust gas.

The temperature of the exhaust gas from the drying furnace is approximately 200 to 300°C, which is a temperature suitable for drying and hardening paint chips and making them brittle, and also a temperature that does not burn out parts such as metal drainboards. . .

Therefore, by simply guiding the exhaust gas to a member to which uncured paint debris has adhered, the paint debris can be dried and cured without burning out the member.

The paint debris thus dried and hardened becomes brittle and can be removed from the member very easily by well-known shot blasting or sharpening.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram showing an example of equipment for removing adhered paint debris in which the present invention is implemented.

The attached paint debris removal equipment 1 includes a sludge feeder 2. Auxiliary burner 3. Drying oven4. a rotary kiln 6 equipped with an incinerator 5;
It utilizes a deodorizing furnace 8 equipped with a deodorizing burner 7, a waste heat boiler 9, an electric precipitator 10, an induced fan 11, a chimney 12, etc., and a processing equipment 13 for materials to be treated such as sludge,
In addition, a paint curing furnace 14, a three-way switching damper 15, a three-way switching damper 16, etc. are added.

A treated material A such as sludge is fed into the rotary kiln 6 from the sludge feeder 2 .

The rotary kiln 6 is a combination of a drying furnace 4 and an incinerator 5 for the material to be processed, and the heat lag of the auxiliary burner 3 and the material to be processed are
It dries the processed material by its own combustion heat.

The exhaust gas temperature at the outlet of the rotary kiln 6 is approximately 200 to 3
00°C and contains the odor of processed material A.

If the member B to which paint debris has adhered is not to be dried and cured, the drying oven 4 of the rotary kiln 6 is removed via the three-way switching damper 15.
The exhaust gas is directly introduced into a deodorizing furnace 8, heated to approximately 700°C or higher by a deodorizing burner 7, and deodorized. After heat recovery is performed by a waste heat boiler 9, dust is removed by an electric precipitator 10, and an induced blower is used. It is released from the chimney 12 through 1 unit.

When drying and curing component B with paint debris attached,
By operating the three-way switching damper 15 and the three-way switching damper 16, the exhaust gas from the drying oven 4 of the rotary kiln 6 is passed through the paint curing oven 14 and then introduced into the deodorizing oven 8.

In the paint curing furnace 14, the member B to which paint debris has adhered is placed on a pallet 17 in advance.

When the exhaust gas from the rotary kiln 6 is introduced into the paint curing furnace J4, the paint debris adhering to the component B in an uncured state will be completely dried and hardened in about 1 to 2 hours, becoming brittle and easy to remove. state.

After about 1 to 2 hours have passed after introducing the exhaust gas, return the three-way switching damper 15 and the three-way switching damper 16 to their original positions, take out the member B along with the 7N6 let 17 from the paint curing furnace 14, replace it with the next one, and do the same. Repeat the steps.

The paint chips adhering to the removed part B will harden and become n'
6: It is easily removed by shot blasting or chipping.

The removed paint waste can be put into the rotary kiln 6 and used as fuel.

In addition, when curing paint scraps, an odor may be generated or
Since the exhaust gas itself is inherently odorous, the addition of the odor from paint chips has no effect, and deodorization can be carried out under the same conditions.

Next, the paint curing furnace will be explained.

FIG. 2 is a longitudinal sectional front view showing the general structure of the paint curing furnace. FIG. 3 is a longitudinal sectional side view thereof.

Exhaust gas from the drying oven 4 of the rotary kiln 6 is uniformly introduced into the oven from above one side of the paint curing oven main body 18 through a baffle plate J9 having a large number of holes.

The exhaust gas that has crossed the furnace is passed through a similar baffle plate 1 on the opposite side.
9 and is discharged from the upper side of the other side, and is led to the deodorizing furnace 8.

In the paint curing furnace 14, the member B with paint debris attached is placed.In this case, the member B is inserted into the pallet 17 so that gaps are formed between the many members, and is then placed on the cart 2o9. The container is placed on a vehicle and carried into the furnace, and the door 21 is closed to allow the exhaust gas to flow.

By doing this, the exhaust gas can pass uniformly between the members 8 and evenly dry and harden the adhering paint debris.

In addition, in the previous example, drying and
Although the curing and paint waste removal are performed in a so-called batch manner, they are not limited to this, and can also be performed continuously.

In addition, if the temperature of the exhaust gas from the rotary kiln's drying oven is low and the paint chips are sufficiently hardened and do not become brittle or deteriorate, a dedicated auxiliary burner is installed, and a portion of the auxiliary fuel used in the deodorizing burner is used in the auxiliary burner. It is also possible to raise the temperature of the exhaust gas by doing this before introducing it into the paint curing furnace. in this case,
Since a part of the auxiliary fuel used in the deodorizing burner is used, effective treatment can be performed without the need for special auxiliary fuel.

According to the present invention, adhering paint debris is removed by dry blasting or chiseling after drying and curing, so the paint debris becomes uniform particles or lumps and is easily removed from the member, unlike the conventional method. does not turn into powder. For this reason, even if the temporary member is reused with paint debris still attached to it, the paint debris is uniformly granular or clumpy as described above, so it cannot be the most important dust to be removed by painting equipment.

Furthermore, since exhaust gas is used as a heat source, there is no risk of paint debris igniting.

Furthermore, the amount of heat required to harden the paint chips is extremely small, as it is only necessary to raise the temperature of the member to which the paint chips are adhered to approximately 200 to 300°C. In other words, in the conventional method of incinerating paint waste, about 70
Since the temperature had to be raised above 0℃, a large amount of heat was required, and for example, approximately 40 to 60 J of heavy oil was required to dispose of one ton of paint chips or adhered parts. According to the invention, only about 10 J is required.

In addition, according to the present invention, for example, the original treatment of tη mud and the like can be combined with the heat curing treatment of paint debris adhering to parts, which is rational and energy-saving, and the effect is tremendous. be.

However, the removed paint debris can be effectively used as fuel, resulting in further energy savings.

[Brief explanation of the drawing]

Figure 1 shows attached paint debris removal equipment d1i that implements the present invention.
A schematic diagram showing an example. FIG. 2 is a longitudinal sectional front view showing the general structure of the paint curing furnace. FIG. 3 is a longitudinal sectional side view thereof. 1... Equipment for removing adhering paint debris 4... Drying oven 8... Deodorizing oven J3... Treatment equipment 14... Paint curing oven A...・Processed material B・・・・Parts

Claims (1)

[Claims] The hot air discharged from the furnace is directed to parts with uncured paint chips attached to them, drying and curing the paint chips attached to the parts.
A method for removing adhering paint debris, characterized in that the dried and hardened paint debris is removed from the hindlimb member by subjecting the member to shot blasting or sharpening treatment.