JP2018105516A - Paint drying equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide coating drying equipment where, even in the case exhaust heat from a high temperature furnace is fed to a low temperature furnace, the furnace temperature of the low temperature furnace can be easily regulated.SOLUTION: Hot wind heated by a heating furnace 22 is fed to a high temperature furnace 15 to heat the inside of the furnace, exhaust gas after the heating is purified by a filter box 25 and is fed to a low temperature furnace 16. External air is freely introduced into the filter box 25 via a second damper 34, and, by the opening degree of the second damper 34, the flow rate of the external air to be introduced into the filter box 25 is controlled, and it is mixed with exhaust has to regulate the quantity of the hot wind to be fed into the low temperature furnace 16.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a coating drying facility in which the inside of a low-temperature furnace is heated by exhaust of hot air heated in the high-temperature furnace.

  The main parts that make up the body of automobiles, etc., are often made of metal materials. However, from the viewpoints of weight reduction and design, etc., peripheral parts to be mounted on the body of the car body are changed from conventional metal parts to resin parts. Tend to switch to

  In this case, if the metal parts and the resin parts are dry-baked in the same dry-baking furnace, the resin material may be thermally deformed due to the difference in heat-resistant temperature. Must be done in a furnace.

  For example, in Patent Document 1 (Japanese Patent Publication No. 58-3191), exhaust from a high temperature drying baking furnace (high temperature furnace) is purified directly or after passing through an afterburner and a catalyst, and then a low temperature drying baking furnace (low temperature furnace). ) Has been disclosed in which thermal energy is effectively utilized by supplying to (1).

Japanese Patent Publication No.58-3191

  In the technique disclosed in the above-described document, the exhaust heat from the high temperature furnace is supplied to the low temperature furnace, so the temperature inside the low temperature furnace is determined by the exhaust heat supplied from the high temperature furnace side. It will be.

  However, the dry baking temperature range for resin parts in a low temperature furnace is predetermined, and if the exhaust heat temperature supplied from the high temperature furnace is high relative to this dry baking temperature, the temperature cannot be adjusted, The difference (color difference) between the hue of the resin part after predetermined drying and the hue of the metal part tends to be large. As a result, there is an inconvenience that the burden required for the hue adjustment after the completion of painting is increased and the production efficiency is lowered.

  In view of the above circumstances, the present invention can easily adjust the temperature in the furnace of the low-temperature furnace even when the exhaust heat from the high-temperature furnace is supplied to the low-temperature furnace, and is required for hue adjustment after the completion of painting. An object of the present invention is to provide a paint drying facility that can greatly reduce the burden and improve the production efficiency.

  The present invention includes a high-temperature furnace for drying and baking metal parts after applying a paint, a low-temperature furnace for drying and baking resin parts after applying a paint, a heating furnace for supplying hot air to the high-temperature furnace, A first exhaust passage for discharging the hot air that has heated the high-temperature furnace, a circulation passage for supplying the exhaust from the first exhaust passage to the low-temperature furnace, and a first circulation for circulating the exhaust from the low-temperature furnace to the heating furnace. In the paint drying facility having two exhaust paths, the mixing box to which the first exhaust path and the circulation path are connected, the outside air introduction path connected to the mixing box, and the outside air introduction path are interposed. An outside air flow rate adjusting means for adjusting the outside air flow rate introduced into the mixing box, a heat amount measuring means for measuring the amount of heat of hot air passing through the circulation path, a heat amount measured by the heat amount measuring means, and the preset low temperature The target furnace temperature in the furnace and Based further comprising a furnace temperature control means for adjusting the amount of heat of the hot by controlling the flow rate through the circulation path of the ambient air flow rate adjusting means.

  According to the present invention, the flow rate of the hot air that heats the inside of the low-temperature furnace is controlled by controlling the flow rate of the outside air introduced into the mixing box by the furnace temperature control means, so that the exhaust heat from the high-temperature furnace is transferred to the low-temperature furnace. Even in the case of supplying, the in-furnace temperature of the low-temperature furnace can be easily adjusted. As a result, even if the same paint is applied to the metal parts of the high temperature furnace and the resin parts of the low temperature furnace, the color difference after predetermined drying is reduced, and the burden required for hue adjustment Can be greatly reduced and production efficiency can be improved.

Schematic configuration diagram of paint drying equipment according to the first embodiment Schematic plan view showing the heat source supply system for the high-temperature drying baking furnace and the low-temperature drying baking furnace The same configuration diagram showing the heat source supply system for the high temperature drying baking furnace and the low temperature drying baking furnace The simplified schematic diagram of the heat source supply system of FIG. Same configuration diagram of furnace temperature control unit Same as above, high-temperature drying baking furnace temperature control routine Same as above, low temperature drying baking furnace temperature control routine Schematic explanatory drawing which shows the coating drying line by 2nd Embodiment of this invention. Sectional view showing the heat source supply system of the paint drying equipment Schematic explanatory diagram corresponding to FIG. 8 according to a third embodiment of the present invention

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 7 show a first embodiment of the present invention. A painting facility 1 shown in FIG. 1 includes a vehicle body 2 as an example of a metal part constituting a vehicle body M1 as a part to be painted, and a front bumper 3 and a rear bumper as examples of resin parts attached to the vehicle body 2. 4, the same paint is applied, and the applied body 2 and the bumpers 3 and 4 are separately dried and baked in parallel.

  This coating equipment 1 is placed on the conveying jigs Jt1 and Jt2 (see FIG. 3) from the previous process, and the same paint is applied to the vehicle body M1 composed of the vehicle body 2 and the bumpers 3 and 4 which are conveyed by the conveyor. Are applied at once, and a separation drying baking process 13 is provided.

  The separation drying baking process 13 is a process for drying and baking the paint applied to the vehicle body 2 and the bumpers 3 and 4 in the coating process 12, and includes a vehicle separation unit 14 and a high temperature drying baking furnace (hereinafter referred to as "high temperature furnace"). (Abbreviation) 15, a low-temperature drying baking furnace (hereinafter abbreviated as “low-temperature furnace”) 16, a hue collation unit 17, a hue adjustment unit 18, and a vehicle body assembly unit 19. The vehicle body separation unit 14 separates the vehicle body M1 conveyed from the coating process 12 by moving the conveyance jigs Jt1 and Jt2 on which the vehicle body M1 is mounted on the vehicle body 2 and the bumpers 3 and 4, respectively.

  The high-temperature furnace 15 dry-bakes the metal body body 2 that has been carried in at a high temperature (for example, 170 °) for a preset time. The low-temperature furnace 16 dry-bakes the loaded resin bumpers 3 and 4 at a temperature (for example, 120 °) lower than that of the high-temperature furnace 15 for a preset time.

  The hue matching unit 17 compares the hues (Lab values) of the vehicle body 2 and the bumpers 3 and 4 that have been dry-baked, and checks whether the difference (color difference) is within an allowable range. Further, when the color difference is out of the allowable range, the hue adjusting unit 18 adjusts the hue of the vehicle body 2 or the bumpers 3 and 4 so that the color difference is within the allowable range. Accordingly, when the color difference is within the allowable range, the vehicle body 2 and the bumpers 3 and 4 pass through the hue adjusting unit 18 as they are.

  In addition, the vehicle body assembly unit 19 attaches bumpers 3 and 4 to the vehicle body 2 that has been conveyed from the hue adjustment unit 18 to collect the vehicle body M1. Then, the assembled vehicle body M1 is carried out to a subsequent process (imitation process).

  As shown in FIG. 2, the high temperature furnace 15 and the low temperature furnace 16 have a predetermined line length for drying and baking when the vehicle body 2 and the bumpers 3 and 4 are moved at a constant speed. As shown in FIG. 2, hot air inlets 15a, 16a are opened at predetermined intervals along the length of the furnace at both lower portions of the high-temperature furnace 15 and the low-temperature furnace 16. Exhaust ports 15b and 16b are opened above the hot air inlets 15a and 16a at predetermined intervals along the furnace length.

  The branched downstream ends of the first air supply duct 21 serving as the first air supply path are respectively connected to the hot air inlets 15a opened in the high temperature furnace 15, and the first air supply duct 21 is assembled. The upstream side is connected to the heating furnace 22. In addition, a first blower fan 23 that supplies hot air in the direction of the hot air introduction port is interposed in the assembly portion of the first air supply duct 21.

  An upstream end of a first exhaust duct 24 serving as a first exhaust path is connected to an exhaust port 15 b opened in the high-temperature furnace 15, and the downstream side of the first exhaust duct 24 is gathered into a filter box 25. A second blower fan 26 that is connected and feeds exhaust gas in the direction of the filter box 25 is interposed in the collective portion. The filter box 25 purifies the exhaust discharged from the high temperature furnace 15.

  Further, the upstream end of a circulation duct 27 as a circulation path is connected to the filter box 25, the middle of the circulation duct 27 is branched into a plurality of parts, and each downstream end is connected to the hot air inlet 16 a of the low temperature furnace 16. . In addition, a third blower fan 28 for sending hot air from the filter box 25 side toward the hot air introduction port 16a is interposed in the assembly portion of the circulation duct 27.

  Further, the branched upstream end of a second exhaust duct 29 as a second exhaust path is connected to the exhaust port 16b of the low temperature furnace 16, and the downstream side of the second exhaust duct 29 is assembled and connected to the heating furnace 22. Has been. Further, a fourth blower fan 30 for sending exhaust gas to the heating furnace 22 side is interposed in the gathering portion of the second exhaust duct 29.

  Reference numeral 31 denotes an outside air introduction duct as an outside air introduction path. The downstream side of the outside air introduction duct 31 is branched into a first branch duct 31a and a second branch duct 31b, and the first branch duct 31a is connected to the heating furnace 22. The second branch duct 31b is connected to the filter box 25. In addition, a fifth blower fan 32 for supplying outside air to the branch ducts 31 a and 31 b is interposed in the outside air introduction duct 31. In addition, first and second dampers 33 and 34 as external air flow rate adjusting means for adjusting the flow rate of external air are interposed in the branch ducts 31a and 31b, respectively.

  The heating furnace 22 includes a burner 35 and heats the air passing through the burner 35. In addition, a filter 36 for purifying hot air passing therethrough is built in the heating furnace 22. Further, as shown in FIGS. 3 and 4, a first temperature sensor 37 that detects the temperature of the passing hot air is connected to the upstream side of the first blower fan 23 of the first air supply duct 21. Further, a temperature sensor 38 that detects the temperature of hot air passing therethrough and a flow rate sensor 39 that measures the flow rate of hot air are connected to the circulation duct 27 downstream of the third blower fan 28. The two sensors 38 and 39 constitute the heat quantity measuring means of the present invention.

  As shown in FIG. 5, the opening degree of the first and second dampers 33 and 34 described above is controlled by a furnace temperature control unit 41 as furnace temperature control means. The in-furnace temperature control unit 41 performs control based on the hot air temperature detected by the first and second temperature sensors 37 and 38 and the hot air flow rate measured by the flow rate sensor 39. That is, the hot air temperature after heating by the heating furnace 22 detected by the first temperature sensor 37 is read, the opening degree of the first damper 33 is controlled so that the hot air temperature falls within the set temperature range, and the inside of the high temperature furnace 15 Adjust the temperature. Further, the temperature of the hot air discharged from the filter box 25 by the second temperature sensor 38 and sent to the low temperature furnace 16 is detected, and the flow rate of the hot air is measured by the flow rate sensor 39. Based on the result, the second damper 34 is measured. And the temperature of the hot air supplied to the low temperature furnace 16 is adjusted to keep the temperature inside the low temperature furnace 16 within a certain range.

  The in-furnace temperatures of the high temperature furnace 15 and the low temperature furnace 16 controlled by the in-furnace temperature control unit 41 are specifically the high temperature furnace temperature control routine shown in FIG. 6 and the low temperature shown in FIG. It is adjusted according to the furnace temperature control routine. Both routines are executed in parallel. The body 15 and the bumpers 3 and 4 to which the same paint is applied in the coating process 12 are continuously fed into the furnaces 15 and 16 at predetermined intervals. , 30 and 32 are operated continuously, whereby hot air is supplied to the furnaces 15 and 16.

  First, the high temperature furnace temperature control routine will be described. In this routine, the exhaust gas heated in the low temperature furnace 16 by the operation of the fourth blower fan 30 in step S <b> 1 is supplied to the heating furnace 22 through the second exhaust duct 29. In step S 2, outside air is introduced into the heating furnace 22 through the outside air introduction duct 31 by the operation of the fifth blower fan 32. The opening degree of the first damper 33 interposed in the outside air introduction duct 33 is adjusted when the previous routine is executed.

  Then, the process proceeds to step S <b> 3, the exhaust gas from the low temperature furnace 16 side and the outside air are mixed in the heating furnace 22, and the mixture is heated to a predetermined temperature by heating the burner 35. The heating furnace 22 is provided with a filter 36, and when passing through the filter 36, coarse dust such as paint mixed in an air-fuel mixture, particularly exhaust gas from the low-temperature furnace 16, or volatile organic matter. Impurities such as compound (VOC) are removed and purified.

  And it progresses to step S4, and the hot air heated by the heating furnace 22 passes through the 1st air supply duct 21 of the high temperature furnace 15 by the operation | movement of the 1st ventilation fan 23 interposed by the 1st air supply duct 21. Air is supplied into the furnace through a plurality of hot air inlets 15a that open to the lower portion and heated.

  Meanwhile, in step S5, the temperature of the hot air passing through the first air supply duct 21 detected by the first temperature sensor 37 is read. In step S6, whether the hot air temperature is within a preset allowable range, that is, It is checked whether or not it has a quantity of heat sufficient to maintain the inside of the high temperature furnace 15 in the set temperature range.

  If the hot air temperature is within the allowable range, the process proceeds to step S8. If the hot air temperature is out of the allowable range, the process branches to step S7. For example, the center value of the allowable range is set as the target hot air temperature, and the target hot air temperature and the hot air temperature detected by the first temperature sensor 37 are set. Based on the difference, the opening degree of the first damper 33 is controlled and adjusted so that the hot air temperature falls within the allowable range. That is, when the hot air temperature detected by the first temperature sensor 37 is below the allowable range, the opening ratio of the first damper 33 is reduced, and the ratio of the outside air to the exhaust from the low temperature furnace 16 side of the mixture heated by the burner 35 Lower. As a result, the temperature drop of the air-fuel mixture due to the outside air is suppressed, and the temperature of the hot air is increased accordingly, and feedback control is performed so that the hot air temperature falls within the allowable range. On the other hand, when the hot air temperature exceeds the allowable range, the opening degree of the first damper 33 is increased, the flow rate of the outside air supplied to the heating furnace 22 is increased, and the temperature of the air-fuel mixture is actively reduced, so that the hot air Feedback control is performed so that the temperature falls within the allowable range.

  As a result, the temperature in the high temperature furnace 15 (furnace temperature) is maintained at a predetermined high temperature by the hot air blown from the plurality of hot air inlets 15a.

  Then, the process proceeds to step S8, and the exhaust gas heated in the high temperature furnace 15 is supplied to the filter box 25 by the operation of the second blower fan 26 interposed in the first exhaust duct 24 from the exhaust port 15b. Exit. The filter box 25 removes and purifies impurities such as coarse dust such as paint and volatile organic compounds (VOC) mixed in the exhaust from the high temperature furnace 15 and mixes the exhaust and the outside air. Therefore, the filter box 25 has a function as a mixing box of the present invention.

  Next, the low temperature furnace temperature control routine will be described. In this routine, first, the exhaust air from the high temperature furnace 15 supplied to the filter box 25 and the outside air introduced through the outside air introduction duct 31 are mixed and generated by the operation of the third blower fan 28 in step S11. The heated hot air is sent to the plurality of hot air inlets 16 a opened at the bottom of the low temperature furnace 16 through the circulation duct 27. Then, the inside of the furnace is heated by the hot air blown out from the plurality of hot air inlets 16a.

  Meanwhile, in step S12, the temperature of the hot air passing through the circulation duct 27 is detected by the second temperature sensor 38, and in step S13, the flow rate per unit time of the hot air passing is measured by the flow rate sensor 39. Then, the process proceeds to step S14, and the low temperature furnace is set based on the preset temperature difference between the target furnace temperature of the low temperature furnace 16 and the temperature of the hot air passing through the circulation duct 27 and the flow rate per unit time passing through the circulation duct 27. The amount of heat supplied to 16 is calculated, and it is checked whether this amount of heat is within a predetermined range. In other words, it is examined whether or not the amount of heat supplied can maintain the low temperature furnace 16 in a predetermined temperature range with respect to the target furnace temperature.

  And when this calorie | heat amount is settled in the tolerance | permissible_range, it progresses to step S16 as it is. If it is outside the allowable range, the process branches to step S15, the target flow rate for reducing the amount of heat by the outside air is calculated, the opening degree of the second damper 34 is controlled, and the outside air supplied to the low temperature furnace 16 is calculated. Adjust the flow rate to the target flow rate.

  When the temperature and flow rate of the exhaust gas after heating the inside of the high-temperature furnace 15 is stable, the opening degree of the first damper 33 is maintained in a substantially constant state. Accordingly, the exhaust temperature and flow rate flowing into the filter box 25 are also substantially constant.

  As a result, the hot air temperature detected by the second temperature sensor 38 and the hot air flow rate detected by the flow sensor 39 depend on the opening degree of the second damper 34, and the flow rate increases if the opening degree of the second damper 34 is increased. However, the hot air temperature decreases. On the other hand, if the opening degree of the second damper 34 is reduced, the flow rate decreases and the hot air temperature rises. For example, when the temperature of the hot air for heating the high temperature furnace 15 is 170 ° and the temperature of the hot air for heating the low temperature furnace 16 is set to 120 °, the temperature of the exhaust heat exhausted from the high temperature furnace 15 is naturally low. The temperature inside the furnace of the furnace 16 is higher. Therefore, by controlling the opening degree of the second damper 34, it is possible to obtain the amount of hot air necessary for supplying the low temperature furnace 16.

  In step S15 described above, the second damper 34 is opened so that the amount of heat supplied to the low temperature furnace 16 is within an allowable range by calculation or map search based on the heat amount obtained in step S14 and the target furnace temperature of the low temperature furnace 16. Adjust the degree. Thereafter, when the process proceeds from step S14 or step S15 to step S16, the exhaust gas after the inside of the low temperature furnace 16 is heated is sent to the heating furnace 22 to be refluxed and the routine is exited.

  As described above, in this embodiment, when the exhaust heat from the high temperature furnace 15 is supplied to the low temperature furnace 16 and heated, the exhaust heat is cooled by mixing with the outside air, and the low temperature furnace 16 is optimally heated. Since the temperature is adjusted to the hot air temperature, the temperature inside the low temperature furnace 16 can be easily adjusted. As a result, the temperature inside the low-temperature furnace 16 can be easily managed, and the hues of the bumpers 3 and 4 after the completion of painting can be kept within a certain range. The color difference between 3 and 4 can be within an allowable range. Therefore, the burden required for hue adjustment can be greatly reduced, and the production efficiency can be improved.

[Second Embodiment]
8 and 9 show a second embodiment of the present invention. In the present embodiment, the high-temperature furnace 15 and the low-temperature furnace 16 are arranged adjacent to each other, and both the furnaces 15 and 16 are integrated, a heat source supply system is formed in both the furnaces 15 and 16, and the high-temperature furnace 15 In contrast, hot air is blown out from above. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 8, the high-temperature furnace 15 and the low-temperature furnace 16 are adjacent to each other with a passage space therebetween. Moreover, as shown in FIG. 9, the 1st adjustment part 15c is provided in the upper part of the high temperature furnace 15, and the 2nd adjustment part 15d is provided in the lower part. Further, a third adjustment unit 16 c is provided at the lower part of the low temperature furnace 16.

  The lower part of the flow path space formed between the furnaces 15 and 16 is a first exhaust duct 24, and the upper part through the filter box 25 is a circulation duct 27. Furthermore, a flow path space formed between the high temperature furnace 15 and the low temperature furnace 16 above the circulation duct 27 from the outer wall of the low temperature furnace 16 is used as a second exhaust duct 29. The downstream end of the first air supply duct 21 is connected to the first adjustment unit 15 c, while the downstream end of the second exhaust duct 29 is communicated with the heating furnace 22.

  The first and second adjustment units 15c and 15d have an adjustment function, and further adjust the humidity, VOC concentration, dust cleanliness, etc. of hot air flowing into or out of the high temperature furnace 15 (inside air). . The third adjusting unit 16c has a physical filter and an adjusting function for removing foreign matters mixed in the hot air after heating the low temperature furnace 16, and the adjusting function is as follows. Steam and VOC are recovered utilizing the fact that the saturation density is higher than the saturation density at high temperature.

  Although not shown, a first temperature sensor 37 is connected to the first air supply duct 21, and a second temperature sensor 38 and a flow rate sensor 39 are connected to the circulation duct 27. In addition, the first to fifth blower fans 23, 26, 28, 30 and 32 are interposed in the ducts 21, 24, 27, 29 and 31. Furthermore, the temperature control inside the high temperature furnace 15 and the low temperature furnace 16 is the same as that in the first embodiment described above, and thus the description thereof is omitted.

  In such a configuration, when the outside air whose flow rate is adjusted by the opening degree of the first damper 33 and the exhaust gas after flowing through the second exhaust duct 29 after heating the low temperature furnace 16 passes through the heating furnace 22. The hot air is mixed and heated to a predetermined temperature, and blown out through the first air supply duct 21 to the first adjusting portion 15c.

  In the 1st adjustment part 15c, the humidity of the inflowing hot air (inside air), VOC density | concentration, a dust clean degree, etc. are adjusted, it blows off to the high temperature furnace 15, and the high temperature furnace 15 is heated predetermined. Then, the heated exhaust is sent to the second adjusting unit 15d, and after adjusting the humidity, VOC concentration, dust cleanness, etc., the exhaust is sent to the first exhaust duct 24, and the flow rate is controlled by the opening of the second damper 34. It is sent to the filter box 25 together with the adjusted outside air.

  The air-fuel mixture of the exhaust gas and the outside air sent to the filter box 25 is mixed in a predetermined manner and purified by removing impurities, and then blown out to the adjacent low-temperature furnace 16 through the circulation duct 27 to pass through the inside of the furnace. Heat. Further, since the low temperature furnace 16 is adjacent to the high temperature furnace 15 through the duct space, the low temperature furnace 16 is also heated by radiant heat of hot air passing through the first exhaust duct 24 and the circulation duct 27.

  The hot air heated to a predetermined temperature in the low-temperature furnace 16 removes foreign matter by the third adjusting unit 16c, collects water vapor and VOC, and returns to the heating furnace 22 from the second exhaust duct 29.

  As described above, in this embodiment, the high temperature furnace 15 and the low temperature furnace 16 are adjacent to each other through the duct space, and the first exhaust duct 24 and the circulation duct 27 are formed in the duct space. The inside of the low-temperature furnace 16 can be heated also by the radiant heat of the hot air passing through the heating chamber, and the heating efficiency in the low-temperature furnace 16 is improved. In addition, since the second exhaust duct 29 is formed on the outer wall of the low temperature furnace 16 and the high temperature furnace 15, the entire equipment can be made compact.

[Third Embodiment]
FIG. 10 shows a third embodiment of the present invention. This embodiment is a modification of the second embodiment described above. In addition, about the component same as 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the present embodiment, the downstream end of the first air supply duct 21 connected to the heating furnace 22 and the upstream end of the second exhaust duct 29 connected to the low temperature furnace 16 are viewed in a plan view of the high temperature furnace 15 and the low temperature furnace 16. It is opened at a position biased on the one side (upstream side with respect to the line flow in the figure).

  Further, the upstream side of the first exhaust duct 24 and the downstream side of the circulation duct 27 provided in the duct space formed between the high-temperature furnace 15 and the low-temperature furnace 16 adjacent to each other are shown in plan view in the other (downstream of the line in the figure). The high temperature furnace 15 and the low temperature furnace 16 are connected at a position biased to the side).

Thereby, the hot air blown out from the first air supply duct 21 to the high temperature furnace 15 flows obliquely in the high temperature furnace 15 from the upper part to the lower part, so that the inside of the furnace can be efficiently heated. Similarly, since the hot air blown out from the circulation duct 27 to the low temperature furnace 16 flows obliquely from the lower part to the upper part in the furnace, the inside of the furnace can be efficiently heated in this case as well. For example, the heating furnace 22 may be provided with a vent to adjust the pressure increase of the outside air introduced from the outside air introduction duct 31 via the dampers 33 and 34.

1 ... painting equipment,
2 ... Body body,
3 ... Front bumper,
4 ... Rear bumper,
12 ... coating process,
13: Separation drying baking process,
14 ... body separation part,
15 ... high temperature drying baking furnace,
15a, 16a ... hot air inlet,
15b, 16b ... exhaust port,
15c ... 1st adjustment part,
15d ... 2nd adjustment part,
16 ... Low-temperature drying baking furnace,
16c ... 3rd adjustment part 17 ... Hue collation part,
18 ... Hue adjustment section,
19 ... Body assembly part,
21 ... First air duct,
22 ... heating furnace,
23. First blower fan,
24. First exhaust duct,
25 ... Filter box,
26 ... the second blower fan,
27 ... circulation duct,
28. Third fan,
29 ... second exhaust duct,
30 ... Fourth fan,
31 ... outside air introduction duct,
31a ... 1st branch duct,
31b ... the second branch duct,
32 ... Fifth fan
33 ... first damper,
34 ... The second damper,
35 ... Burner,
36 ... filter,
37 ... first temperature sensor,
38 ... second temperature sensor,
39 ... Flow sensor,
41 ... Furnace temperature controller,
Jt1, Jt2 ... Conveying jig,
M1 ... Body

Claims (4)

A high-temperature furnace for drying and baking metal parts after applying paint,
A low-temperature furnace for drying and baking resin parts after applying paint;
A heating furnace for supplying hot air to the high temperature furnace;
A first exhaust path for discharging the hot air that heated the high-temperature furnace;
A circulation path for supplying exhaust from the first exhaust path to the low temperature furnace;
In the paint drying facility having a second exhaust passage for circulating the exhaust from the low temperature furnace to the heating furnace,
A mixing box to which the first exhaust path and the circulation path are connected;
An outside air introduction path connected to the mixing box;
An outside air flow rate adjusting means that adjusts an outside air flow rate that is interposed in the outside air introduction path and is introduced into the mixing box;
A calorific value measuring means for measuring the calorific value of the hot air passing through the circulation path;
In the furnace, the flow rate of the outside air flow rate adjusting means is controlled based on the heat quantity measured by the heat quantity measuring means and the preset target furnace temperature in the low temperature furnace to adjust the heat quantity of the hot air passing through the circulation path A paint drying facility, further comprising a temperature control means. The high temperature furnace and the low temperature furnace are adjacent to each other through a flow path space,
The first exhaust path and the circulation path are formed in the flow path space, and the mixing box is interposed between the first exhaust path and the circulation path. Item 1. A paint drying facility according to item 1. The first exhaust path is formed in the lower part of the flow path space and the upstream is connected to the lower part of the high temperature furnace,
The circulation path is formed in the upper part of the flow path space and the downstream is connected to the upper part of the low temperature furnace,
The mixing box is interposed between the first exhaust path and the circulation path in the flow path space,
A first air supply path for blowing hot air from the heating furnace to the high temperature furnace is connected to an upper portion of the high temperature furnace,
The paint drying facility according to claim 2, wherein an upstream side of the second exhaust passage is connected to a lower portion of the low-temperature furnace. The downstream end of the first air supply path and the upstream end of the first exhaust path are connected to the high temperature furnace at different positions in the line flow direction,
The coating according to claim 2 or 3, wherein a downstream end of the circulation path and an upstream end of the second exhaust path are connected to the low temperature furnace at different positions in a line flow direction. Drying equipment.

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