JP5399350B2 - Odor detection system for painting equipment - Google Patents

Description

  The present invention relates to an odor detection system for a coating facility that detects an odor around the coating facility.

  In general, when atomization is applied to an object in a painting booth (painting equipment), contaminated air (gas) containing paint mist or volatile organic solvents fills the painting booth due to overspray. End up. Since some of the contaminated air may leak around the painting booth, the worker's health may be harmed by the paint mist and volatile organic solvent contained in the leaked gas. Therefore, it has been conventionally proposed to provide a sensor (odor sensor) for detecting leakage of contaminated air from the painting booth outside the painting booth. The odor sensor measures the odor intensity of the gas around the painting booth, thereby detecting the leakage of contaminated air.

  However, since the above sensor is constantly exposed to odor when measuring the odor intensity, the sensor deteriorates in a short period of time and the life of the sensor is reduced. Therefore, various techniques for shortening the usage time of the sensor have been proposed (see, for example, Patent Documents 1 and 2). Specifically, in the prior art described in Patent Document 1, since the operation frequency of the sensor (gas sensor) is adjusted based on the gas flow rate, it is possible to prevent the sensor from being always in use. It is possible to extend the service life. Moreover, in the prior art described in Patent Document 2, when a gas inflow signal is received from a gas meter, the sensor (gas sensor) of the gas alarm is driven, so that the life of the gas alarm can be extended.

Japanese Patent Laid-Open No. 2001-344673 (FIG. 1 etc.) JP 2001-141595 A (FIG. 2 etc.)

  However, in the conventional techniques described in Patent Documents 1 and 2, even if the measurement by the sensor is completed, the odor continues to stay in the detection unit of the sensor. As a result, since it is impossible to suppress the deterioration of the sensor in a short period of time, it is practically impossible to extend the life of the sensor.

  This invention is made | formed in view of said subject, The objective is to provide the odor detection system of the coating equipment which can suppress deterioration of an odor sensor reliably.

In order to solve the above-mentioned problems, in the invention described in means 1, in the system for detecting the odor around the coating equipment, the odor is installed outside the painting equipment, and the gas around the painting equipment is used as the gas to be measured. An odor sensor for measuring strength; a gas path in which the odor sensor is installed; and a first state in which the gas to be measured is introduced to the odor sensor on the gas path upstream of the odor sensor Switching means for switching to a second state in which an odor-removing or odorless replacement gas is introduced to the odor sensor, and the gas to be measured or the gas to be measured and gas introduction means for introducing a replacement gas into the odor sensor, and a switching control means for outputting a driving signal for switching the switching means to said first state or said second state For example, said gas to be measured is guided to the odor sensor intermittently measuring the intensity of odor, the every time to complete the measurement of the intensity of the odor due to the odor sensor, before Symbol substituted for the gas to be measured by directing the use gas to the odor sensor, said staying in the detecting portion of the odor sensor is replaced once the gas to be measured in the replacement gas, and maintains its state until the next measurement, odor by the odor sensor When the measurement of the strength of the gas is completed, the length of the pause time during which the introduction of the gas to be measured is paused is set, and the switching control means sets the length of the pause time according to the operating condition of the painting facility. The gist of the odor detection system for a painting facility, characterized in that is changed .

  Therefore, according to the invention described in the above means 1, every time the measurement of the odor intensity by the odor sensor is completed, the odor sensor or the odorless replacement gas is used instead of the gas to be measured instead of the gas to be measured. By leading to the odor sensor, the gas to be measured staying in the detection part of the odor sensor is temporarily replaced with a replacement gas. As a result, since the odor sensor is exposed to the odor (measured gas) only when measuring the odor intensity, the time during which the measured gas stays in the detector, that is, the time during which the odor sensor is exposed to the odor. Shorter. Therefore, deterioration of the odor sensor can be surely suppressed, and as a result, the life of the odor sensor can be extended.

Further , according to the invention described in the above means 1 , since the gas to be measured and the replacement gas flow through the gas path, all of the gas to be measured and the replacement gas are reliably supplied to the odor sensor installed in the gas path. Can lead to. Therefore, the odor intensity of the gas to be measured can be reliably measured.

The gist of the invention described in the means 2 is that the means 1 includes a deodorizing means for generating the replacement gas by taking in and deodorizing the gas around the painting facility.

Therefore, according to the invention described in the above means 2 , the replacement gas can be generated by using the gas around the painting facility, so that it is not necessary to prepare the replacement gas separately. Therefore, the running cost of the odor detection system of the painting facility can be suppressed.

Further , according to the invention described in the above means 1 , the length of the pause time for stopping the introduction of the gas to be measured, that is, the length of the measurement interval of the odor intensity is changed according to the operating condition of the coating equipment. doing. Therefore, when the measurement gas has a weak smell, if the measurement interval is increased by extending the pause time, the state in which the measurement gas is replaced with the replacement gas is maintained longer. That is, since the time during which the odor sensor is exposed to the gas to be measured is shortened, deterioration of the odor sensor can be suppressed more reliably. On the other hand, when the measurement gas has a strong odor, if the measurement interval is shortened by shortening the pause time, the introduction of the measurement gas is restarted quickly. Can be measured. As a result, since the measurement by the odor sensor is not overlooked, the measurement accuracy of the odor intensity is improved.

The invention described in means 3 is that in the above means 1 or 2 , the operating condition of the coating equipment is a pause in which the painting of the coating object is suspended during the operation in which the coating object is coated in the painting equipment. And the maintenance of the coating equipment, the switching control means makes the suspension time during the suspension longer than the suspension time during the operation, and sets the suspension time during the maintenance during the suspension during the operation. The gist is to make it shorter than time.

Therefore, according to the invention described in the means 3 , the pause time when the coating of the coating object is paused is longer than the pause time during the operation when the coating of the coating object is performed. Moreover, the downtime at the time of the maintenance of the painting equipment is made shorter than the downtime at the time of operation. In other words, the longer the measurement interval is extended by extending the pause time as the odor tends to be weakened, the longer the measurement gas is replaced with the replacement gas. In this case, since the time during which the odor sensor is exposed to the gas to be measured is shortened, deterioration of the odor sensor can be more reliably suppressed. On the other hand, the shorter the measurement interval is shortened by shortening the downtime as the operating condition is likely to increase the smell, the introduction of the gas to be measured will be resumed quickly, and the odor intensity of the gas to be measured Can be measured frequently by the odor sensor. As a result, since the measurement by the odor sensor is not overlooked, the measurement accuracy of the odor intensity is improved.

As described above in detail, according to the first to third aspects of the invention, it is possible to provide an odor detection system for a painting facility that can reliably suppress deterioration of the odor sensor. In particular, according to the invention described in claim 1, it is possible to reliably measure the intensity of the odor of the gas to be measured.

The schematic block diagram which shows the odor detection system of the coating booth in this embodiment. The timing chart which shows the measurement frequency of odor intensity. The timing chart which shows the relationship between operation | movement of a switching valve and the output of an odor sensor. Explanatory drawing which shows an odor sensor.

  Hereinafter, an embodiment embodying the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the odor detection system 1 includes a painting booth 2 (painting equipment) and an odor measurement control panel 3, and detects the odor around the painting booth 2. The painting booth 2 is for forming a coating film on the surface of the automobile body 10 by spraying a paint on the automobile body 10 (object to be coated). This painting booth 2 is provided on the upper side of the painting chamber 11 for painting the automobile body 10 and for supplying air of a downflow (a certain direction from the upper side to the lower side) to the painting chamber 11. An air supply chamber 12 and an exhaust chamber 13 provided on the lower side of the painting chamber 11 for exhausting air in the painting chamber 11 are provided.

  In the coating chamber 11, the automobile body 10 is painted by spraying a paint mist (atomized paint), which is a mixture of air and atomized paint, from the rotary atomizing type coating machine 14. At this time, the paint mist oversprayed and scattered from the coating machine 14 is guided from the coating chamber 11 to the exhaust chamber 13 by the downflow air. The exhaust chamber 13 sucks the contaminated air in the coating chamber 11 including the paint mist by the suction force of the exhaust fan 15 and processes the sucked contaminated air. The air purified in the exhaust chamber 13 is released to the atmosphere by the exhaust fan 15.

  As shown in FIG. 1, the odor measurement control panel 3 is installed outside the painting booth 2 and includes air to be measured (measuring gas) that is air (gas) around the painting booth 2 and air to be measured. There is also provided an air supply passage 21 (gas path) through which replacement air (substitution gas) having weak odor and no odor flows. The air supply channel 21 branches on the upstream side into a first supply pipe 21a through which air to be measured flows and a second supply pipe 21b through which replacement air flows. The air to be measured according to the present embodiment is air that has leaked or discharged from the painting booth 2 and can include air in the painting booth 2 and paint mist that has not adhered to the automobile body 10. .

  Further, a switching valve 22 (switching means), an odor sensor 23, and a suction pump 24 (gas introduction means) are installed on the air supply flow path 21. The switching valve 22 is installed upstream of the odor sensor 23 on the air supply flow path 21 and at a connection portion between the first supply pipe 21a and the second supply pipe 21b. The switching valve 22 is configured to switch the air supply passage 21 between a first state and a second state. The switching valve 22 is configured to be able to supply air to be measured to the odor sensor 23 when switched to the first state. The switching valve 22 can supply replacement air to the odor sensor 23 when switched to the second state. Note that the switching valve 22 of this embodiment is a valve that is operated by a two-position switching motor 22a.

  Further, the odor sensor 23 shown in FIG. 1 is installed outside the painting booth 2 and on the downstream side of the switching valve 22 on the air supply passage 21. The odor sensor 23 is turned on when the intensity of the odor of the air flowing through the air supply passage 21 (measured air or replacement air) is measured by a detection unit (not shown), and the odor measurement signal is output. It is designed to output. On the other hand, the odor sensor 23 is turned off when the odor intensity is not measured, and does not output an odor measurement signal.

  In addition, as FIG. 4 shows, the odor sensor 23 is provided with two sensor parts (1st sensor part 23a and 2nd sensor part 23b). Further, a switching valve (not shown) is installed at a location where the air supply channel 21 branches into the first sensor portion 23a side and the second sensor portion 23b side. The switching valve switches between a state in which measured air or replacement air can be supplied to the first sensor unit 23a and a state in which measured air or replacement air can be supplied to the second sensor unit 23b. ing. Note that the switching valve of this embodiment is a valve that is operated by a two-position switching motor (not shown). In the present embodiment, the odor intensity is usually measured using only the first sensor unit 23a. And when exchanging the 1st sensor part 23a, or when calibrating the 1st sensor part 23a, the intensity of an odor is measured using the 2nd sensor part 23b.

  As shown in FIG. 1, the suction pump 24 is installed on the downstream side of the odor sensor 23 on the air supply channel 21. The suction pump 24 sucks air (measured air or replacement air) flowing through the air supply passage 21 and guides it to the odor sensor 23.

  An adsorbent 25 (deodorizing means) is installed on the second supply pipe 21b. The adsorbent 25 takes in the air around the painting booth 2 and deodorizes it, thereby generating replacement air.

  Next, the electrical configuration of the odor detection system 1 will be described.

  As shown in FIG. 1, the odor detection system 1 includes a control device 30 that comprehensively controls the entire device. The control device 30 is constituted by a known computer including a CPU 31, a memory 32, an input / output port 33, and the like. The CPU 31 is electrically connected to the coating machine 14, the exhaust fan 15, the switching valve 22, the odor sensor 23, and the suction pump 24, and controls them according to various drive signals. For example, the CPU 31 has a signal indicating that the painting booth 2 is activated or stopped, a signal indicating whether or not the paint mist is discharged from the painting machine 14, and the exhaust fan 15 during normal operation or low speed operation. A signal indicating that it is present is input.

  Then, the CPU 31 performs control for guiding the air to be measured to the odor sensor 23 and intermittently measuring the odor intensity. Specifically, the CPU 31 has a function as a switching control means, and outputs a switching valve opening / closing signal (driving signal) to the switching valve 22 so as to perform control for switching the switching valve 22 to the first state. It has become. In addition, the CPU 31 performs control to output a drive signal to the suction pump 24 and start suction of air by the suction pump 24. As a result, since the air to be measured passes through the first supply pipe 21a and the air supply flow path 21 in order and is guided to the odor sensor 23, the odor intensity of the air to be measured can be measured. The odor sensor 23 is configured to output an odor measurement signal when the intensity of the odor is measured. Further, the CPU 31 sets (stores) the odor intensity measurement time t1 (see FIGS. 2 and 3) by the odor sensor 23 in the memory 32 as a measurement timer, and whether or not the odor measurement signal is input from the odor sensor 23. Start detection. In addition, the measurement time t1 is set to the shortest time (1 minute in this embodiment) which can measure the intensity of smell.

  Further, the CPU 31 shown in FIG. 1 subtracts the set measurement timer. Then, the CPU 31 outputs a switching valve open / close signal to the switching valve 22 every time the measurement of the odor intensity by the odor sensor 23 is completed, specifically, every time the measurement timer reaches 0 ms. Control to switch to the second state is performed. As a result, the gas around the coating booth 2 is taken into the second supply pipe 21b and guided to the adsorbent 25, and the introduced gas is deodorized by the adsorbent 25 to become replacement air. Then, the replacement air passes through the second supply pipe 21b and the air supply flow path 21 in order, is guided to the odor sensor 23, and the measured air staying in the detection unit of the odor sensor 23 is temporarily replaced with the replacement air. It is done. This state is maintained until the next measurement. Specifically, the CPU 31 is triggered by outputting a switching valve opening / closing signal to the switching valve 22, and any one of pause times T1 to T3 (see FIGS. 2 and 3) for stopping the introduction of air to be measured. Is set (stored) in the memory 32 as a pause timer, and the subtraction of the pause timer is started. In the present embodiment, the suspension time T1 during operation is set to 10 minutes, the suspension time T2 during suspension is set to 20 minutes, and the suspension time T3 during maintenance is set to 5 minutes. Thereafter, the CPU 31 performs control to start the next measurement every time the pause timer reaches 0 ms.

  Further, the CPU 31 performs control to change the length of the pause times T1 to T3 when the measurement of the odor intensity is completed according to the operation status of the painting booth 2. In addition, there are three operating conditions in the present embodiment, that is, when the car body 10 is painted in the painting booth 2, when the painting of the car body 10 is stopped, and when the painting booth 2 is maintained. It is divided. During maintenance, since a large amount of thinner (volatile organic solvent) is used for cleaning the painting booth 2, the odor is strongest. On the other hand, at the time of a stop, since the work using the thinner (painting of the automobile body 10 and cleaning in the painting booth 2) is not performed at all, the odor is the weakest.

  The CPU 31 shown in FIG. 1 indicates that the paint booth 2 is stopped, a signal that paint mist is not being discharged from the paint machine 14, and the exhaust fan 15 is operating at low speed. When the signal indicating is input, it is determined that the current operation status is during maintenance. Further, the CPU 31 receives a signal indicating that the painting booth 2 is activated, a signal indicating that the paint mist is not being discharged from the coating machine 14, and a signal indicating that the exhaust fan 15 is operating at a low speed. If it is, it is determined that the current driving situation is at rest. Further, the CPU 31 receives a signal indicating that the painting booth 2 is activated, a signal indicating that the paint mist is being discharged from the coating machine 14, and a signal indicating that the exhaust fan 15 is in normal operation. If it is, it is determined that the current driving situation is during driving.

  Then, when the CPU 31 shown in FIG. 1 determines that the current operation state is during maintenance, the CPU 31 performs control to change the suspension time to a suspension time T3 that is shorter than the suspension time T1 during operation. The measurement frequency of the odor sensor 23 is increased (see “high frequency” shown in FIG. 2). In this way, since the odor intensity is frequently measured at the time of maintenance with a strong odor, the measurement accuracy of the odor intensity is improved. In addition, when the CPU 31 determines that the current driving situation is a pause, the CPU 31 performs control to change the pause time to a pause time T2 that is longer than the pause time T1 during operation, thereby measuring the odor sensor 23. The frequency is lowered (see “low frequency” shown in FIG. 2). Further, when the CPU 31 determines that the current driving state is driving, the CPU 31 performs a control to change the pause time to the pause time T1, thereby making the measurement frequency of the odor sensor 23 moderate. (Refer to “medium frequency” shown in FIG. 2). Note that the CPU 31 always performs control for guiding the replacement air to the odor sensor 23 at the end of the operation, and expels the air to be measured that stays in the detection unit of the odor sensor 23.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the odor detection system 1 of the present embodiment, each time the measurement of the odor intensity by the odor sensor 23 is completed, the odor sensor 23 detects the odor sensor 23 by introducing the odorless replacement air to the odor sensor 23. The air to be measured staying in is temporarily replaced with replacement air. As a result, the odor sensor 23 is exposed to the odor (measuring air) only when the odor intensity is measured, so the time during which the odor sensor 23 is exposed to the odor is shortened. Therefore, the deterioration of the odor sensor 23 can be reliably suppressed, and as a result, the life of the odor sensor 23 can be extended.

  (2) In this embodiment, since the time during which the odor sensor 23 is exposed to odor is shortened, the energization time of the odor sensor 23 can be shortened, so that power consumption can be reduced. Further, since the odor sensor 23 is deteriorated by energization, if the energization time can be shortened, the life of the odor sensor 23 can be extended.

  (3) Since the adsorbent 25 of this embodiment can generate replacement air using the air around the coating booth 2, it is not necessary to separately prepare a gas cylinder filled with replacement air. Therefore, the running cost of the odor detection system 1 can be suppressed.

  In addition, you may change this embodiment as follows.

  In the above-described embodiment, the adsorbent 25 takes in air around the painting booth 2 and deodorizes it to generate odorless replacement air, and the generated replacement air is supplied to the odor sensor 23. It was. However, the adsorbent 25 may be omitted, and the replacement air may be supplied to the odor sensor 23 from a gas cylinder filled with the replacement air. Further, the adsorbent 25 may be omitted, and fresh air taken from the outside of the painting booth 2 may be supplied to the odor sensor 23 as replacement air as it is. In addition, when using fresh air as replacement air, it is preferable to take in the air of the location away from the coating booth 2. If the air around the painting booth 2 is taken in, the odor strength of the taken-in replacement air is almost the same as the odor strength of the air to be measured, so every time the odor strength measurement is completed, Even if the air to be measured staying in the detection unit of the odor sensor 23 is replaced with the replacement air, the possibility that the odor sensor 23 is exposed to the odor increases.

  The odor sensor 23 of the above embodiment includes two sensor units 23a and 23b, and usually measures the odor intensity using the first sensor unit 23a, and replaces or calibrates the first sensor unit 23a. At that time, the second sensor unit 23b is used to measure the odor intensity. However, you may make it use the 2nd sensor part 23b also at the time of normal. For example, you may make it use the 1st sensor part 23a and the 2nd sensor part 23b alternately, whenever it measures the intensity of smell. In this way, since the measurement frequency of the first sensor unit 23a (or the measurement frequency of the second sensor unit 23b) is halved, the deterioration of the first sensor unit 23a (or the second sensor unit 23b) is more reliably suppressed. be able to. Note that either one of the first sensor unit 23a and the second sensor unit 23b may be omitted.

  -The suction pump 24 of the said embodiment was installed in the downstream rather than the odor sensor 23 on the air supply flow path 21. FIG. However, the suction pump 24 may be installed on the air supply channel 21 on the downstream side of the switching valve 22 and on the upstream side of the odor sensor 23.

  In the above embodiment, the object to be coated in the painting booth 2 is the automobile body 10. However, the article to be coated may be an automotive component such as an aerodynamic addition (such as a spoiler) or a bumper. The article to be coated does not necessarily have to be an automotive part.

  In the above-described embodiment, the painting facility is embodied in the painting booth 2. However, the painting facility may be embodied in another facility such as a drying furnace or a pond.

  Next, the technical ideas grasped by the embodiment described above are listed below.

  (1) In any one of said means 1 thru | or 5, said to-be-measured gas can contain the air in the said coating equipment, and the atomization coating material which did not adhere to the said to-be-coated object, The said fog An odor detection system for coating equipment, wherein the paint is a mixture of the air and the atomized paint.

  (2) In any one of said means 1 thru | or 5, the said replacement gas is the air taken in from the exterior of the said coating equipment, The odor detection system of the painting equipment characterized by the above-mentioned.

DESCRIPTION OF SYMBOLS 1 ... Odor detection system 2 ... Painting booth 10 as coating equipment ... Automobile body 21 as to-be-coated object ... Air supply flow path 22 as gas path ... Switching valve 23 as switching means ... Odor sensor 24 ... As gas introducing means Suction pump 25 ... adsorbent 31 as deodorizing means ... CPU as switching control means
T1 to T3 ... Rest time

Claims (3)

In the system that detects the odor around the painting equipment,
An odor sensor that is installed outside the painting facility and measures the odor intensity of the gas around the painting facility as a gas to be measured ;
A gas path in which the odor sensor is installed;
A first state where the gas to be measured is installed on the upstream side of the odor sensor on the gas path and the gas to be measured is guided to the odor sensor, and a replacement gas having a weaker odor or odorless than the gas to be measured is Switching means switched to a second state guided by the odor sensor;
A gas introduction means installed on the gas path, for guiding the gas to be measured or the replacement gas to the odor sensor;
Switching control means for outputting a drive signal for switching the switching means to the first state or the second state ;
The measurement gas is guided to the odor sensor to measure the odor intensity intermittently,
Every time the odor sensor measure the intensity of the odor due to the completion, by directing the front Symbol replacement gas instead of the gas to be measured in the odor sensor, the measured gas staying in the detecting portion of the odor sensor Is replaced with the replacement gas once, and the state is maintained until the next measurement ,
When the measurement of odor intensity by the odor sensor is completed, set the length of the pause time for stopping the introduction of the gas to be measured,
The odor detection system for a painting facility, wherein the switching control means changes the length of the downtime according to the operating condition of the painting facility. The odor detection system for a painting facility according to claim 1 , further comprising a deodorizing unit that generates the replacement gas by taking in and deodorizing a gas around the coating facility. The operation status of the painting facility includes an operation in which painting of an object is performed in the painting facility, a pause in which painting of the object is suspended, and a maintenance time of the painting facility.
Said switching control means, according to claim 1, wherein the pause time at rest as well as longer than downtime during the operation, and wherein the downtime during the maintenance to be shorter than the pause time during the operation Or the odor detection system of the coating equipment of 2 .

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