JPH032021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a coating substance removal device that removes coating substances adhering to objects to be removed by thermal decomposition.

[Prior art]

Generally, when spray painting, the object to be painted is held in a metal painting jig.
Since the coating jig is in a coating state along with the object to be coated, the more times it is used, the thicker the coating substance will adhere to the surface, which will impede its use. Therefore, in the past, the coating jig, which is the object to be removed and which has coating substances adhered to its surface, was put into a batch-type incinerator, for example, and the coating substances attached to the surface of the coating jig were incinerated and removed. There is.

However, with such conventional technology, it is difficult to control the temperature inside the incinerator because the coating material burns at a high temperature in the incinerator. Painting jigs tend to undergo thermal distortion and may become impossible to reuse, and the surface of the painting jigs after incineration is coated with residues of the incinerated coating material, and after cooling, painting jigs may not be able to be used again. The drawback was that it required scrubbing off the residue from the jig with a brush or the like.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to prevent the occurrence of thermal distortion on the object to be removed, and to remove the residue of coating substances adhering to the surface of the object to be removed. An object of the present invention is to provide a coating substance removing device that can eliminate the problem and improve work efficiency.

[Summary of the invention]

The present invention relates to a rotary furnace that accommodates a large number of ceramic granules and rotates around a substantially horizontal axis, and a rotary furnace that is provided on an inner circumferential wall of the rotary furnace and that rotates the granules as the rotary furnace rotates. The rotary furnace is characterized in that it includes a scraping member that scrapes up and drops the rotary furnace, and a hot air supply device that supplies hot air into the rotary furnace.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, the coating substance removal device will be described with reference to FIGS. 1 and 2. 1 is a base, and 2 is a substantially long cylindrical rotary furnace installed on the base 1 as described later. A large number of ceramic granules 3 are housed inside the rotary furnace 2, and these many granules 3 have cross-sections that are intermittently attached to the inner circumferential wall of the rotary furnace 2 over approximately the entire length. As the rotary furnace 2 rotates in the direction of arrow 5, it is scraped up and dropped by a large number of roughly L-shaped scraping members 4. 6
is the object to be removed to which the coating substance has adhered, and this is
It is inserted and supported by a cylindrical support member 8 (only the right end is shown) which is supported within both ends of the rotary furnace 2 via a plurality of support arms 7 . Reference numeral 9 denotes an exhaust cover that covers one end of the rotary furnace 2. An exhaust pipe 10 for discharging exhaust gas is provided on the upper surface of the exhaust cover 9, and an exhaust pipe 10 for discharging exhaust gas is provided on the back surface of the exhaust cover 9 to cover one end of the rotary furnace 2. A door 11 that opens and closes an inlet/outlet (not shown) for loading and unloading.
is provided. A loading/unloading device 12 for the object 6 to be removed is installed on the right side of the door 11 in FIG. Reference numeral 13 denotes an annular sealing member, and a flange 13a of this is attached to the right side surface of the exhaust cover 9, so that it comes into contact with the outer circumference of the rotary furnace 2. On the other hand, an annular rail 14 and a chain wheel 15 are fixed to the outer periphery of the right end of the rotary furnace 2, and the rail 14 is a rotatable support roller of a support stand 16 fixed to the base 1. 1
It is supported by 7. In this case, although not shown, a rail, a support stand, and a support roller similar to the rail 14, support stand 16, and support roller 17 are provided on the left end side of the rotary furnace 2, so that the rotary furnace 2
is rotatably installed on the base 1 so that its axial direction is substantially horizontal. In addition, support roller 1
7 and the support stand 16 are respectively on the left side and the support stand 16 as shown in FIG.
A right pair is provided, and flanges 18, 18 are formed on both sides of the support roller 17 to restrict movement of the rotary furnace 2 in the axial direction and in the left and right directions in FIG. . Reference numeral 19 denotes a drive device consisting of a motor, a speed reduction mechanism, etc. A small chain wheel 21 is fixed to its drive shaft 20, and a chain 22 is stretched between the small chain wheel 21 and the chain wheel 15. ,
Thus, the rotation of the drive shaft 20 is transmitted to the rotary furnace 2 via the small chain wheel 21, the chain 22, and the chain wheel 15 as rotation in the direction of the arrow 5.

Now, the configuration of the entire system including the coating substance removal device will be described with reference to FIG. 23 is a substantially cylindrical hot air supply device, and a first burner 24 as a heating device is disposed at one end (left end) of this, and a turbo blower (not shown) is provided inside. There is. Then, the hot air supply device 23 generates high-speed hot air from the air sucked in from the outside by the turbo blower and the heat from the burner 24, and supplies it from the other end to an intake cover 9' having substantially the same configuration as the exhaust cover 9. It is designed to be supplied to the rotary furnace 2 via. 25 is a cyclone dust collector, which separates the residue of the thermally decomposed coating material from the exhaust gas discharged from the rotary furnace 2 through the exhaust stack 10. 26 is cyclone dust collector 25
This is a forced fan that sends the exhaust gas from the heat exchanger 27 to the combustion furnace 28 through one of the flow paths of the heat exchanger 27.
A second burner 29 as a heating device is disposed at one end of the combustion furnace 28, and the exhaust gas discharged from the other end is passed through the other flow path of the heat exchanger 27 to the wet scrubber 30. sent to. Although not shown, a wet filter is provided inside the wet scrubber 30, and a water tank 31 is provided in the lower part. A portion of the exhaust gas that has passed through the other flow path of the heat exchanger 27 is sent into the hot air supply device 23 by a force fan 32. Reference numeral 33 denotes an induction fan, which sucks exhaust gas from the wet scrubber 30, sends it into the chimney 34, and discharges it to the outside.

Next, the operation of the above configuration will be explained. In this embodiment, the object to be removed 6 is, for example, an automobile painting trolley.
This is precisely provided with supporting unevenness and metal fittings for mounting and supporting the automobile, and must not cause thermal distortion. The coating substance adhering to the object to be removed 6 is obtained by adding an inorganic substance such as a pigment or dye as a coloring agent to a base material mainly made of an organic polymer material such as vinyl, acrylic, or polyester, and further adding a hardening agent, Stabilizers, plasticizers, and solvents are added to this product, and when it is dried and baked after painting, most of the solvent contained inside has evaporated, solidified, and is applied to the surface of the object to be removed 6. It's attached. The object to be removed 6 with the coating substance adhered to it is carried into the rotary furnace 2 from the carry-in/out device 12 through the exhaust cover 9 with the door 11 open, and is supported by the support member 8 . Then, the door 11 is closed and the first burner 2 is closed.
By igniting 4 and operating a turbo blower (not shown), the temperature of 550°C to 600°C is supplied from the hot air supply device 23.
℃ hot air is generated, this hot air is supplied to the rotary furnace 2, and the drive device 19 is operated to rotate the rotary furnace 2 in the direction of the arrow 5, for example, 30 times per minute. As a result, the hot air supplied to the rotary furnace 2 heats the ceramic granules 3 housed in the rotary furnace 2, and the heated ceramic granules 3 emit far infrared rays to heat the object 6 to be removed. . Furthermore, as the rotary furnace 2 rotates, the ceramic granules 3 are scraped up by the scraping member 4 and fall onto the object 6 to be removed, so that the granules 3 surround the object 6 to be removed. collide like that. Due to the synergistic effect of the far-infrared thermal energy emitted by the granular material 3 and the hot air, the coating material adhering to the surface of the object 6 to be removed is thermally cracked (cracking) from the surface part and thermally decomposed. combustible gas (for example, CHn, _H2, etc.) is generated, but the ceramic granules 3 are removed from the object 6.
Because of its uniform presence in sequence around the air, its blocking action and the speed of the hot air prevent the flammable gas from being ignited, and the flammable gas is mixed into the hot air. On the other hand, after the coating material is thermally decomposed, a residue is generated on the surface of the object to be removed 6, but the ceramic granules 3 dropped by the scraping member 4 constantly collide with the surface of the object to be removed 6. Therefore, the residue is peeled off from the surface of the object 6 to be removed and mixed with the hot air. Thereafter, the exhaust gas mixed with flammable gas and residue enters the cyclone dust collector 25 by the suction action of the forcing fan 26. Here, only the residue is removed, and the flammable gas is mixed with the exhaust gas and reaches the combustion furnace 28 through one of the flow passages of the heat exchanger 27 by the suction action of the forcing fan 26. This combustion furnace 28 is controlled by a second burner 29 so that the internal temperature is approximately 700°C, and the flammable gas that has entered the combustion furnace 28 is blown by the flame of the second burner 29. It is then ignited and completely combusted in the combustion furnace 28. Thereafter, a part of the exhaust gas from the combustion furnace 28 is sucked in by the forced fan 32 and passed through the other flow path of the heat exchanger 27 to the hot air supply device 23.
supplied to Further, the remainder of the exhaust gas that has passed through the other flow path of the heat exchanger 27 passes through the wet scrubber 30 that is sucked in by the induction fan 33. During this passage, the exhaust gas is discharged to the outside from the chimney 34 after the dust and smoke contained therein are captured.

According to this embodiment, the following effects can be obtained. That is, the object to be removed 6 to which the coating substance has adhered is housed and supported in the rotary furnace 2, and the rotary furnace 2
While supplying high-velocity hot air heated to 550°C to 600°C, the rotary furnace 2 is rotated 30 times per minute to scrape the ceramic granules 3 stored in the rotary furnace 2 with the scraping member 4. The scraped material was dropped onto the object 6 to be removed, thereby thermally decomposing the coating material adhering to the object 6 to be removed, and preventing the flammable gas generated by the thermal decomposition from igniting in the rotary furnace 2. So,
Unlike the case of incineration in a conventional batch type incinerator, there is no thermal distortion in the object 6 to be removed.
All of the objects 6 to be removed can be reused. Also,
Since the rotary furnace 2 is rotated 30 times per minute and the ceramic granules 3 housed in the rotary furnace 2 are scraped up by the scraping member 4 and dropped onto the object 6 to be removed, the ceramic granules 3 are removed by thermal decomposition. The residue can be automatically peeled off and removed from the object to be removed 6, and unlike the conventional method, there is no need to perform work such as scrubbing the residue off the object to be removed with a brush or the like after cooling, and work efficiency can be improved. Furthermore, since the flammable and harmful gases generated in the rotary furnace 2 are combusted in the combustion furnace 28, air pollution problems such as the release of black smoke and harmful gases can be solved. Moreover, since a part of the exhaust gas with extremely low oxygen concentration from the combustion furnace 28 is supplied to the hot air supply device 23, the hot air supplied into the rotary furnace 2 has a low oxygen concentration and high velocity. Therefore, ignition within the rotary furnace 2 can be further suppressed, and the intended purpose can be fully achieved.

FIG. 4 shows a second embodiment of the present invention,
The same parts as in the previous embodiment are given the same reference numerals and the explanation thereof will be omitted, and only the different parts will be explained below. That is, 35 is a drive device for rotating the rotary furnace 2 in forward and reverse directions, and 36 is a scraping member having a shape symmetrical to the scraping member 4, that is, an inverted L-shape, which corresponds to the arrow 5 indicating the reverse rotation of the rotary furnace 2. The direction means that when rotating in the reverse direction, the ceramic granules 3 are scraped up and dropped. Therefore, in the second embodiment, the ceramic granules 3 are placed more closely to the object to be removed 6 than in the first embodiment.
It has the advantage of being able to fall evenly.

In each of the above embodiments, the temperature of the hot air supplied to the rotary furnace 2 was controlled to be 550°C to 600°C, but the temperature and speed of the hot air may vary depending on the type of coating substance attached to the object 6. Accordingly, it may be selected as appropriate so that the coating material is thermally decomposed in the rotary furnace 2 and the flammable gas generated by the thermal decomposition is not ignited.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be implemented with appropriate modifications within the scope of the gist, for example, the object to be removed may be an instrument used for painting. Of course it is possible.

〔Effect of the invention〕

As is clear from the above description, the present invention accommodates a large number of ceramic granules in a rotary furnace, and as the rotary furnace rotates, a scraping member provided on the inner circumferential wall of the rotary furnace disposes of the granules. Since the body is raised and dropped, and the hot air supply device supplies hot air into the rotary furnace, it is possible to prevent thermal distortion from occurring in the object to be removed stored in the rotary furnace. In addition, the residue of the coating material that occurs on the surface of the object to be removed is automatically removed, eliminating the need for removal work.
This has the effect of increasing work efficiency.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is a partial side view showing a main part in section, and FIG. 3 is an overall view. 4 is a block diagram of a processing system, and FIG. 4 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention. In the drawings, 1 is a base, 2 is a rotary furnace, 3 is a ceramic granule, 4 is a scraping member, 6 is an object to be removed, 8 is a support member, 23 is a hot air supply device, and 36 is a scraping member. .

Claims (1)

[Claims] 1. A rotary furnace that accommodates a large number of ceramic granules and is rotated around a substantially horizontal axis, and a rotary furnace that is provided on the inner circumferential wall of the rotary furnace and scrapes up the granules as the rotary furnace rotates. and a hot air supply device that supplies hot air into the rotary furnace. A paint substance removal device characterized in that it operates.