JP2016017925A - Dust leakage monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust leakage monitoring system that can prevent an improper dust leakage monitoring state which intentionally or unintentionally occurs to consistently and reliably monitor the presence or absence of dust leakage from an exhaust port of a dust collection exhaust device.SOLUTION: A dust leakage monitoring system 1 includes: a cylindrical duct fixture 10 that is connected to another end of a duct 12 connected to an exhaust port of a dust collection exhaust device; a dust measuring device 20; a wind velocity measuring device 30; and an alarm device 40. When the dust measuring device 20 or the wind velocity measuring device 30 indicates an abnormal value, the alarm device 40 issues an alarm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system for monitoring the leakage of dust such as asbestos. More specifically, the present invention provides a warning when the detection of dust leakage is not performed properly, and can always detect dust leakage reliably. It relates to a leakage monitoring system.

  It is widely known that inhalation of asbestos dust causes health damage such as lung cancer. To date, the Ministry of Health, Labor and Welfare has been working to enhance the prevention of asbestos exposure by workers by establishing and amending rules. As part of this, the revised “Asbestos Hazard Prevention Regulation” was enforced on June 1, 2014, and it became necessary to check (monitor) the presence or absence of asbestos leakage from the exhaust port of the dust collection exhaust system.

  For example, when asbestos removal work is performed, an isolation area isolated from the general area is formed, and the work is performed. From this isolation area, exhaust is performed to the general area via a dust collection exhaust device equipped with a HEPA filter. Is done. According to the revised “Asbestos Hazard Prevention Regulations” from June 1, 2014, it must be checked that asbestos dust is not leaking from the exhaust port of this dust collection exhaust system.

  Under such circumstances, conventionally, as a system for detecting leakage of asbestos dust, for example, an isolation area that is isolated from a general area and in which dust removal work is performed inside is managed using an information terminal device. It is a dust leakage management system. In the isolation area, a dust removal device that inhales air inside the isolation area, passes through a filter and exhausts it to the general area, and the general area measures the concentration of fibrous dust. A dust measurement device is installed, and a pressure gauge is installed to measure the amount of pressure difference between the general area and the isolation area. The fibrous dust concentration measured by the dust measurement device is compared with the set multiple levels, and the dust is measured. A monitor alarm device that determines the concentration level and notifies the alarm according to the determination level by voice or display is installed. If any of the dust concentration is detected, the abnormality of the dust removal device is detected, or the differential pressure is below the predetermined value, alarm information by e-mail or the like is transmitted via the communication network An isolation area dust leakage management system has been proposed (see Patent Document 1).

Japanese Patent No. 5294107

  The dust leakage management system described in Patent Document 1 transmits alarm information when the dust measuring device detects a dust concentration greater than or equal to a predetermined value. However, the dust measuring device is installed near the exhaust port and measured. For example, it is difficult to cope with the case where the exhaust suction part of the dust measuring device is shifted from an appropriate position intentionally or unintentionally.

  Although it is unlikely that such a situation will occur frequently, it is expected that we will be able to handle such cases and take all possible measures in a situation where the national government is taking measures to prevent asbestos scattering. It is natural to be done.

  An object of the present invention is to prevent an inappropriate dust leakage monitoring state that occurs intentionally or unintentionally, and always reliably monitor the presence or absence of dust leakage from the exhaust port of a dust collection exhaust device. It is to provide a dust leakage monitoring system.

  In view of the fact that the inspection (monitoring) of the asbestos dust generated at the time of dismantling of a building is required at the exhaust port of the dust collection exhaust system, the present inventor is able to perform the monitoring reliably and stably. Worked on the development. Generally, a vinyl duct is attached to the exhaust port of a dust collector exhaust system, and an aluminum duct (hereinafter referred to as a front end duct) is attached to the front end of the exhaust duct. The exhaust suction part of the dust measuring device is placed inside, and dust measurement is performed to detect the abnormality. However, the present inventor has found that the dust measurement may not be performed properly due to an unexpected accident, an intentional or unintentional action by an operator, or the like.

  That is, the exhaust from the exhaust port of the dust collection exhaust device is caused by a major breakage of the vinyl duct, leakage from the joint of the vinyl duct and the end duct, movement of the end duct (when measuring near the exit of the end duct), etc. There may be cases where measurement cannot be performed properly. In such cases, the presence or absence of asbestos dust leakage from the exhaust port of the dust collection exhaust system cannot be reliably detected, which is also outside the national guidelines. Focused on.

  As a result of further earnest studies to solve such problems, the present inventor has found that these problems can be solved by detecting the leakage of dust using a wind speed measuring device in addition to the dust measuring device in the tip duct. I found it. In the first place, since there is not much difference between the dust level from the exhaust port of the dust collection exhaust device and the dust level of the outside air, it may be difficult to distinguish the difference between the exhaust and the outside air with the dust measuring device. On the other hand, since the wind speed of the exhaust is very high, it is easy to distinguish the exhaust from the outside air by the wind speed measuring device. Therefore, for example, when a large hole is opened in the vinyl duct or when the joint between the vinyl duct and the tip duct is disconnected and leakage occurs, this abnormality can be easily detected by measuring the wind speed of the wind speed measuring device. it can.

  Furthermore, the inventor moved the exhaust suction part of the dust measuring device intentionally or unintentionally outside the duct, and the exhaust from the exhaust port of the dust collecting exhaust device cannot be appropriately measured. Knowing that proper dust leakage monitoring may not be performed, and in this case, the abnormal velocity is detected by adopting a specific configuration with the suction tube of the dust measuring device and the measuring member of the wind speed measuring device fixed. It was found that it can be easily detected by measuring the wind speed of the measuring device.

  That is, the present invention provides a cylindrical duct fixture connected to the other end of a duct connected to the exhaust port of the dust collection exhaust device, and the exhaust port of the dust collection exhaust device within the cylindrical duct fixture. Dust measuring device and wind speed measuring device for measuring the amount of dust (including dust concentration) and wind speed in the exhaust gas, and an alarm device for alarming when the dust measuring device and / or wind speed measuring device shows an abnormal value A suction tube of the dust measurement device and a measurement member of the wind speed measurement device are inserted from an opening formed in the cylindrical duct fixture, and an exhaust suction portion of the suction tube and a sensor portion of the measurement member Is arranged at a predetermined position in the tubular duct fixture, and relates to a dust leakage monitoring system.

Preferably, in the system of the present invention, when the suction tube of the dust measuring device and the measurement member of the wind speed measuring device are fixed, and when the fixed suction tube and the measuring member are removed from the cylindrical duct fixture, the dust measuring device The sensor unit of the wind speed measuring device is configured to be exposed to the outside of the cylindrical duct fixture before the suction direction of the exhaust suction unit is changed.
Preferably, the tubular duct fixture has an axially extending tube holding tube for inserting and holding the suction tube therein, and an axially extending exhaust suction tube for fitting the suction tube to one end thereof. I have.
Preferably, the opening diameter of the exhaust suction portion of the suction tube is configured to be changeable, and the opening diameter on the suction side of the exhaust suction pipe is configured to be changeable.
Preferably, the alarm device has a function of transmitting alarm information via a communication network, and the alarm information includes a still image or a moving image near the cylindrical duct fixture.
Preferably, the dust measuring device main body, the wind speed measuring device main body, and the alarm device main body are housed in the housing box.
Preferably, a photoelectric sensor for monitoring the vicinity of the cylindrical duct fixture is attached to the lid of the storage box.

  The present invention also relates to a dust leakage monitoring method using the dust leakage monitoring system.

  According to the dust leakage monitoring system of the present invention, it is possible to always reliably monitor the presence or absence of dust leakage from the exhaust port of the dust collection exhaust device.

It is a figure explaining the use condition of the dust leakage monitoring system which concerns on one Embodiment of this invention. In the dust leak monitoring system concerning one embodiment of the present invention, it is a figure explaining the method of installing a dust measuring device and a wind speed measuring device in a cylindrical duct fixture, and (a) is an adsorbed suction tube and measurement. It is a figure which shows the state with which the member was mounted | worn with the cylindrical duct fixing tool, (b) is the figure which has arrange | positioned the suction tube in the predetermined position following the state of (a). It is explanatory drawing of the dust leakage monitoring system which concerns on other embodiment of this invention, In this system, the state which installed the dust measuring device and the wind speed measuring device in the cylindrical duct fixing tool is shown.

  The dust leakage monitoring system of the present invention includes a cylindrical duct fixture connected to the other end of a duct connected to an exhaust port of a dust collection exhaust device, and the dust collection exhaust device in the cylindrical duct fixture. A dust measuring device and a wind speed measuring device that respectively measure the amount of dust in the exhaust from the exhaust port and the wind speed, and an alarm device that issues an alarm when the dust measuring device and / or the wind speed measuring device shows an abnormal value The dust tube and the measuring member of the wind speed measuring device are inserted from an opening formed in the cylindrical duct fixture, and the exhaust suction part of the suction tube and the sensor part of the measuring member are It is not particularly limited as long as it is arranged at a predetermined position in the cylindrical duct fixture, and the main body of the dust measuring device and the wind speed measuring device is preferably housed in a housing box. It is more preferable that the main body of the broadcasting device (alarm communication means) is received in the receiving box.

  The cylindrical duct fixture according to the present invention is connected to the other end of a duct connected to the exhaust port of the dust collecting exhaust device (hereinafter also referred to as an exhaust port duct), and fixes the exhaust duct. It is a fixture to do. As the exhaust port duct, a vinyl duct is usually used from the viewpoint of economy or the like, but the exhaust from the exhaust port is not stable because it has a large wind speed of about 10 to 20 m / second, for example. Therefore, it is preferable that the cylindrical duct fixture of the present invention has a weight that is not affected by the wind force of exhaust gas such as stainless steel. Examples of the shape of the cylindrical duct include a cylindrical shape and a rectangular tube shape.

  This cylindrical duct fixture is provided with one or two openings for inserting the suction tube of the dust measuring device and the measuring member of the wind speed measuring device main body. From the point of easy insertion, the opening is a cylindrical duct. It is preferable that it is provided in the upper part of a fixing tool.

  The dust measuring device of the present invention is not particularly limited as long as it is equipped with a suction tube and can measure the leakage of dust. Particle counter, dust relative concentration meter (digital dust meter), automatic measurement of fibrous particles A commercially available apparatus such as a vessel can be used. By using the dust measuring device, dust in the exhaust discharged from the dust collection exhaust device can be measured, and this ensures reliable monitoring of dust leakage to the outside from the dust generation area (isolation area). be able to. The exhaust suction portion of the suction tube of the dust measuring device is preferably configured so that the opening diameter thereof can be changed. For example, a tapered diameter changing member (usually reducing the diameter) at the tip of the suction tube. It can be set as the structure which attaches. Thereby, even when a dust measuring device having a constant suction speed is used, uniform suction can be performed, and more accurate measurement can be performed.

  The wind speed measuring device of the present invention is not particularly limited as long as it has a measuring member having a sensor portion and can measure the wind speed, and is a commercially available device such as a hot-wire anemometer, a cup-type anemometer, etc. However, it is preferable to use a hot-wire anemometer in consideration of ease of installation on the cylindrical duct fixture. Here, the measurement member is mainly composed of a cable and a sensor part (probe) in the case of a wired connection, and is mainly composed of a sensor part in the case of a wireless connection.

  By using the wind speed measuring device together with the dust measuring device, it becomes possible to detect the exhaust leak due to the breakage of the exhaust duct and the exhaust leak from the joint between the exhaust duct and the tubular duct fixture, Reliable monitoring of dust leakage can be performed. In particular, when the damaged part or the opening of the joint is large and most of the exhaust gas flows out, it becomes impossible to substantially monitor the leakage of dust. According to the system of the present invention, the cylindrical duct fixture These abnormalities can be easily detected by utilizing the difference in wind speed between the inside and outside. It is also possible to detect abnormalities such as when the dust collection exhaust device stops operating.

  As an alarm device of the present invention, when a dust measuring device or a wind speed measuring device shows an abnormal value, an alarm, warning display, lighting of a warning light, etc. can be used to warn an operator, an administrator, a construction worker, etc. If it is a thing, it will not restrict | limit in particular, It is preferable to provide not only the alarm function in the field but the function which transmits alarm information via a communication network. Further, when alarming an administrator or the like through a communication network, it is preferable that the alarm information includes a still image (photograph) or a moving image near the cylindrical duct device. In addition, as part of the alarm device or as a separate device, the storage device such as a data logger that stores the measurement data of the dust measurement device and the wind speed measurement device, and the measurement history data are transmitted continuously every predetermined time. It is preferable to include means for receiving and receiving means for receiving such measurement history data. In addition, when the dust measuring device or the wind speed measuring device shows an abnormal value, when the measured value of the dust measuring device or the wind speed measuring device deviates from the range of the predetermined measured value, the normal time when dust does not leak The case where a different state is detected.

  In the system of the present invention, when the suction tube of the dust measurement device and the measurement member of the wind speed measurement device are fixed, and when the fixed suction tube and measurement member are removed from the cylindrical duct fixture, the exhaust suction of the dust measurement device. It is preferable that the sensor part of the wind speed measuring device is configured to be exposed to the outside of the cylindrical duct fixture before the suction direction of the part is changed. For example, such a configuration can be obtained by making the length on the tip side from the fixing portion of the suction tube of the dust measuring device longer than the length on the tip side from the fixing portion of the measuring member of the wind speed measuring device. More specifically, for example, in a tubular duct fixture, an axially extending tube holding tube holding the suction tube therein, or an axially extending exhaust suction fitting the suction tube at one end thereof By providing a tube and installing a longer suction tube on the tip side thereof, the above-described configuration can be obtained. When an exhaust suction pipe is provided, the suction side of the exhaust suction pipe is preferably configured such that its opening diameter can be changed. For example, a tapered diameter changing member is provided at the exhaust inlet side tip of the exhaust suction pipe. (Normally, the diameter is reduced) can be attached. Thereby, even when a dust measuring device having a constant suction speed is used, uniform suction can be performed, and more accurate measurement can be performed.

  By adopting the configuration as described above, the wind speed measuring device can be easily used even when the suction tube (exhaust suction portion) of the dust measuring device is intentionally or unintentionally removed from the cylindrical duct fixture. Can be detected. That is, detection of the removal of the suction tube of the dust measuring device from the cylindrical duct fixture is often difficult to be performed by the dust measuring device itself because the difference in the amount of dust inside and outside the cylindrical duct fixture is often small. When the suction tube of the dust measuring device is removed, the measurement member (sensor part) of the wind speed measuring device is removed at the same time, and the wind speed measuring device can detect an abnormality, so the inappropriate measurement state of the dust measuring device is easy and reliable. Can be detected to prevent this. Here, “the suction direction of the exhaust suction part of the dust measuring device is changed” means that the direction is changed from the initial suction direction (exhaust direction) to a direction in which exhaust gas cannot be sucked. This refers to the case where the suction tube falls off from the tube holding tube or the exhaust suction tube.

  The suction tube of the dust measuring device and the measuring member of the wind speed measuring device may be fixed so that the suction tube of the dust measuring device and the measuring member of the wind speed measuring device are removed at the same time, and do not need to be strictly adhered. . For example, it may be fixed using an adhesive, an adhesive tape, or the like, but it is possible to fix (fix) both, and to fix (insert) into the opening of the tubular duct fixture to close the opening. It is preferable to fix using a closing member.

  In the system of the present invention, when the exhaust suction part of the dust measurement device and the sensor part of the wind speed measurement device are arranged in the cylindrical duct fixture, the suction tube of the dust measurement device is more exhausted than the sensor part of the wind speed measurement device. It is preferable to arrange so as to be on the side. As a result, even if an illegal act is performed, such as changing the direction of the suction tube disposed at a predetermined position in the cylindrical duct fixture, the hand is inserted into the cylindrical duct fixture. When operating the suction tube, the wind speed measuring device detects a change in the wind speed and can detect such an illegal action.

  Furthermore, the system of the present invention may include monitoring means such as a photoelectric sensor and a video camera for monitoring the vicinity of the cylindrical duct fixture. When a photoelectric sensor is used, when an optical path such as an infrared ray is blocked, an abnormality can be detected and an alarm can be issued. This photoelectric sensor is preferably an integrated light emitter / receiver such as a diffuse reflection method or a retroreflective method that does not require a separate light receiver that requires a power source. In the case of the retroreflective method, a cylindrical duct fixture It is preferable to attach a reflector. In the case of the regression reflection method, it is preferable to attach a photoelectric sensor to the lid of a storage box that houses the main body of the dust measurement device and the wind speed measurement device. As a result, when the lid of the storage box is opened upward, obliquely upward, laterally, etc., the light beam direction changes and the photoelectric sensor reacts, and the dust measuring device and the wind speed measuring device in the storage box It also becomes possible to detect fraudulent acts on the main body.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, FIG. 1 is a diagram for explaining a usage state of the dust leakage monitoring system according to one embodiment of the present invention, and FIG. 2 is a cylindrical duct in the dust leakage monitoring system according to one embodiment of the present invention. It is a diagram illustrating a method of installing a dust measuring device and a wind speed measuring device on the fixture, (a) is a diagram showing a state in which the fixed suction tube and measurement member are mounted on the cylindrical duct fixture, (B) is the figure which has arrange | positioned the suction tube in the predetermined position following the state of (a).

  As shown in FIG. 1, a dust leakage monitoring system 1 according to an embodiment of the present invention includes a cylindrical duct fixture 10, a digital dust meter 20, a hot wire anemometer 30, and an alarm communication device 40. Yes.

  As shown in FIG. 1, the cylindrical duct fixture 10 is made of stainless steel and has a cylindrical shape with a diameter of about 30 cm and a length of about 50 cm, and one of them is a vinyl duct 12 extending from the exhaust port of the dust collection exhaust device. Is fixed with adhesive tape or the like. As shown in FIG. 2, an opening 14 is formed in the upper portion of the cylindrical duct fixture 10, and an axially extending tube holding tube 16 that holds the suction tube 22 is formed in the upper portion of the cylindrical duct fixture 10. Is provided.

  As shown in FIG. 1, the digital dust meter main body 20 ′, the hot-wire anemometer main body 30 ′, and the alarm communication device main body 40 ′ are placed in a storage box 50 having a lid 50 a that can be opened and closed from the front side to the rear side. Contained. The return reflection type photoelectric sensor 52 is attached to the handle of the lid 50a of the storage box 50 by, for example, a clip-type fixing means. The reflector 18 is attached to the cylindrical duct fixture 10 so as to face the photoelectric sensor 52, and detection by the photoelectric sensor 52 is possible.

  A suction tube 22 is connected to the digital dust meter main body 20 ′, and the other is installed in the tube holding tube 16 in the cylindrical duct fixture 10 (see FIG. 2B). A measuring member 32 is connected to the hot-wire anemometer body 30 '. The measuring member 32 includes a cable 32a and a sensor portion 32b at the tip.

  As shown in FIG. 2, the suction tube 22 and the measuring member 32 are fixed by a fixed blocking member 24, and the fixed blocking member 24 is fitted into the opening 14 of the cylindrical duct fixture 10 and fixed. The length of the suction tube 22 is longer than the length of the measuring member 32 on the distal end side from the fixed blocking member 24. The suction tube 22 and the measuring member 32 fixed from the state of FIG. When trying to remove, the sensor unit 32b of the hot-wire anemometer 30 is exposed to the outside before the suction tube 22 comes out of the left end of the tube holding tube 16 (that is, before the suction direction of the exhaust suction unit 22a is changed). It is configured to

  The alarm communication device 40 has a function of transmitting alarm information by e-mail or the like via a communication network. When the digital dust meter 20 or the hot-wire anemometer 30 shows an abnormal value, a measured value is sent to an administrator or the like. Send alarm information such as.

Hereinafter, a setting method and a monitoring method of the dust leakage monitoring system 1 configured as described above will be described.
First, the storage box 50 stores a digital dust meter main body 20 ′, a hot-wire anemometer main body 30 ′, an alarm communication device main body 40 ′, and a photoelectric sensor 52. The storage box 50 is fixed to a cylindrical duct. Bring the tool 10 to the work site and set it.

  The vinyl duct 12 and the cylindrical duct fixture 10 are connected so as to be sealed with an adhesive tape or the like. Subsequently, the suction tube 22 of the digital dust meter 20 and the measuring member 32 of the hot-wire anemometer 30 fixed by the fixing block member 24 are inserted into the upper opening 14 of the cylindrical duct fixture 10, and the fixing block member 24 is inserted. Fit into the opening 14 and fix (see FIG. 2A). At this time, when the suction speed of the digital dust meter 20 is constant, it is preferable to change the diameter of the exhaust suction portion 22a of the suction tube 22 so that proper uniform suction is possible. That is, the dust collection exhaust device is operated, the wind speed in the duct is measured by the hot-wire anemometer 30, and the exhaust suction portion 22 a is opened based on the measured wind speed and the suction speed of the digital dust meter 20. The diameter can be calculated, and a tapered diameter changing member having the calculated opening diameter can be attached to the tip of the suction tube 22. Subsequently, the suction tube 22 is inserted into the tube holding tube 16 (see FIG. 2B). Setting is completed by turning on the power to the digital dust meter 20 or the like.

  During work, the system is constantly operating and monitoring for dust leaks. When the dust concentration increases due to an abnormality of the dust collecting exhaust device or the like, the digital dust meter 20 indicates an abnormal value, and the alarm communication device 40 transmits alarm information to the administrator or the like. Further, for example, when the joint between the vinyl duct 12 and the cylindrical duct fixture 10 is disconnected, the hot-wire anemometer 30 indicates an abnormal value, and alarm information is transmitted to the administrator or the like by the alarm communication device 40. When someone tries to remove the suction tube of the digital dust meter 20, the hot-wire anemometer 30 is also removed at the same time, so the hot-wire anemometer 30 shows an abnormal value and the alarm communication device 40 Alarm information is transmitted to Furthermore, when someone approaches the cylindrical duct fixture 10 and tries to cause harm, the photoelectric sensor 52 senses an abnormality, and the alarm communication device 40 transmits alarm information to the administrator or the like.

  The system of the present invention can also be configured as follows. Here, FIG. 3 is explanatory drawing of the dust leakage monitoring system which concerns on other embodiment of this invention, and shows the state which installed the dust measuring device and the wind speed measuring device in the cylindrical duct fixing tool.

  As shown in FIG. 3, in this embodiment, an exhaust suction pipe 17 is provided instead of the tube holding pipe 16. The suction tube 22 is attached to the exhaust suction pipe 17 to measure dust. In the case of this embodiment as well, the diameter of the tip of the exhaust suction pipe 17 can be adjusted as in the above-described embodiment. As shown in the figure, the distal end side of the suction blocking member 24 of the suction tube 22 is moved so that the suction tube 22 does not come out of the exhaust suction pipe 17 until the sensor portion 32b of the hot-wire anemometer 30 is exposed to the outside. It is long.

DESCRIPTION OF SYMBOLS 1 Dust leak monitoring system 10 Cylindrical duct fixture 12 Vinyl duct 14 Opening 16 Tube holding pipe 17 Exhaust suction pipe 18 Reflector 20 Digital dust meter 20 'Digital dust meter main body 22 Suction tube 22a Exhaust suction part 24 Adhesion block member 30 Heating wire type Anemometer 30 'Hot wire anemometer main body 32 Measuring member 32a Cable 32b Sensor unit 40 Alarm communication device 40' Alarm communication device main body 50 Storage box 50a Lid 52 Photoelectric sensor

Claims (11)

A cylindrical duct fixture connected to the other end of the duct connected to the exhaust port of the dust collection exhaust device, and the amount of dust in the exhaust from the exhaust port of the dust collection exhaust device in the cylindrical duct fixture And a dust measuring device and a wind speed measuring device that respectively measure the wind speed, and an alarm device that gives an alarm when the dust measuring device and / or the wind speed measuring device shows an abnormal value,
The suction tube of the dust measurement device and the measurement member of the wind speed measurement device are inserted from an opening formed in the cylindrical duct fixture, and the exhaust suction portion of the suction tube and the sensor portion of the measurement member are the cylindrical shape. A dust leakage monitoring system, which is arranged at a predetermined position in a duct fixture. The suction tube of the dust measuring device and the measuring member of the wind speed measuring device are fixed,
When the suction pipe and the measuring member that are fixed are removed from the cylindrical duct fixture, the sensor unit of the wind speed measuring device is attached to the cylindrical duct fixture before the suction direction of the exhaust suction section of the dust measuring device is changed. 2. The dust leakage monitoring system according to claim 1, wherein the dust leakage monitoring system is exposed to the outside.   3. The dust leakage monitoring system according to claim 1, wherein the tubular duct fixture includes a tube holding tube extending in an axial direction for inserting and holding the suction tube therein.   The dust leakage monitoring system according to any one of claims 1 to 3, wherein an opening diameter of an exhaust suction portion of the suction tube is changeable.   The dust leakage monitoring system according to claim 1 or 2, wherein the cylindrical duct fixture includes an exhaust suction pipe extending in an axial direction so as to externally fit the suction tube at one end thereof.   6. The dust leakage monitoring system according to claim 5, wherein the opening diameter on the suction side of the exhaust suction pipe is changeable.   The dust leakage monitoring system according to claim 1, wherein the alarm device has a function of transmitting alarm information via a communication network.   8. The dust leakage monitoring system according to claim 7, wherein the alarm information includes a still image or a moving image near the cylindrical duct fixture.   The dust leakage monitoring system according to any one of claims 1 to 8, wherein the dust measuring device main body, the wind speed measuring device main body, and the alarm device main body are housed in a housing box.   The dust leakage monitoring system according to claim 9, wherein a photoelectric sensor for monitoring the vicinity of the tubular duct fixture is attached to the lid of the storage box.   A dust leakage monitoring method using the dust leakage monitoring system according to claim 1.

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