Dust accumulation contact amount monitoring equipment in individual protection state

Abstract

The utility model provides a scheme for detecting the real dust accumulation contact level of an operator in a protection state, and provides dust accumulation contact amount monitoring equipment in an individual protection state, and an air flow channel is formed by connecting an air supply pipeline interface with an air supply pipeline which is communicated with a protection mask; a filtering unit, an air supply unit, a dust measuring unit and a control unit are arranged in the equipment; and the control unit obtains the accumulated dust contact amount by using the dust concentration value monitored by the dust measuring unit. Due to the fact that the dust measuring unit is arranged in the protection device to obtain the dust concentration in the airflow channel, real-time dynamic measurement of the dust concentration in the airflow is achieved, and compared with a protection state, the dust contact concentration calculated through mask protection factors is more accurate; the dust accumulation contact amount is calculated through the dust concentration in the airflow channel, and the actual level of dust contact of operators can be better reflected compared with calculation of the dust accumulation contact amount through the environment dust concentration.

Description

Technical Field

[0001] The utility model relates to the technical field of respirable dust detection in coal mines, in particular to dust cumulative contact amount monitoring equipment in an individual protection state. Background Art

[0002] Coal mining operations generate large amounts of dust, potentially accompanied by harmful gases such as hydrogen sulfide. Therefore, continuous and accurate monitoring of workers' dust exposure is crucial, and numerous researchers have conducted research on this topic. Invention application WO2019128184A1 proposes a method and testing system for calculating the cumulative exposure of mining workers to respiratory dust. Based on respiratory dust concentration distribution, wind flow distribution, and spatial and temporal trajectory data, a multi-level cumulative mathematical model is constructed. This model, taking into account changes in dust concentration at different times and locations, as well as the movement paths of workers, predicts individual exposure to respiratory dust, enabling the calculation of cumulative values ​​for the ambient dust concentration to which workers are exposed. However, this method fails to accurately reflect workers' actual dust exposure when wearing masks. Invention application CN118077995A proposes a wearable device for monitoring and protecting workers from occupational hazards in coal mines. The wearable device's main unit is connected to a protective mask via a fresh air duct. Dust-laden air, driven by the main unit's power unit, enters the main unit through a dust-laden air inlet, delivering filtered fresh air to the protective mask. The wearable device host is electrically connected to a monitoring terminal equipped with a dust measurement module, which monitors the dust, toxic and harmful gases in the environment in real time and issues an alarm when the filter material is overloaded with dust. However, this protective wearable device is also based on the dust concentration monitored in the environment in which the operator is located, and cannot truly reflect the actual level of dust exposure of the operator in a protective state. On the one hand, the method of monitoring dust exposure by only considering the dust concentration in the environment cannot reflect the actual level of dust exposure of the operator; on the other hand, as the amount of dust intercepted by the mask increases, the mask protection factor and dust retention rate also change, making the method of calculating dust exposure through the protection factor also unable to reflect the actual level of dust exposure of the operator. Utility Model Content

[0003] The problem to be solved by the present invention is to provide a solution that can monitor the actual cumulative dust exposure level of workers in protective conditions. In view of this, the purpose of the present invention is to provide a device for monitoring the cumulative dust exposure of individuals in protective conditions.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A device for monitoring cumulative dust exposure in an individual protective state comprises: a housing; a cavity formed within the housing; the housing being formed by a first housing and a second housing; an air inlet provided on the second housing for allowing air to enter the cavity; and an air supply duct interface provided on the housing, which, when in use, is connected to the air supply duct connected to the protective mask to form an air flow channel.

[0006] The cavity is equipped with:

[0007] a filter unit, adjacent to the air inlet, for filtering the air entering the cavity from the air inlet;

[0008] The air supply unit is located on the downwind side of the filter unit and is used to deliver the filtered air to the protective mask along the air supply duct;

[0009] The dust measurement unit is located on the downwind side of the filter unit and is used to monitor the dust concentration value after filtering by the filter unit;

[0010] A control unit connected to the air supply unit and the dust measurement unit;

[0011] The power supply is connected to the control unit and provides power to the entire device.

[0012] The beneficial effects of the present invention are:

[0013] By setting a dust measurement unit in the protective equipment to obtain the dust concentration in the air flow, the real-time dynamic measurement of the dust concentration in the air flow can be achieved. Compared with the dust exposure concentration calculated by the mask protection factor in the protective state, it is more accurate;

[0014] Calculating the cumulative dust exposure by measuring the dust concentration in the airflow within the air supply duct improves the accuracy of the cumulative dust exposure of workers in protective conditions and can better reflect the actual level of dust exposure of workers than calculating the cumulative dust exposure based on ambient dust concentration.

[0015] Furthermore, the filter unit in the device is replaceable, and the user can replace the corresponding filter unit according to different scenarios; a gas monitoring unit is also provided in the device, which interacts with the control unit to calculate the cumulative exposure to harmful gases.

[0016] Furthermore, the shell is composed of a first shell and a second shell and a third shell respectively arranged opposite to the first shell; and the air inlet is arranged on the third shell, which makes it easy to open the shell to inspect or replace components in the cavity.

[0017] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the external structure of a dust cumulative exposure monitoring device in an individual protection state in a specific embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal space of a dust cumulative exposure monitoring device in an individual protection state in a specific embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the connection between a dust cumulative exposure monitoring device and a protective mask in an individual protection state provided by the utility model;

[0022] Figure 4 This is a schematic structural diagram of a dust cumulative exposure monitoring device in an individual protection state according to a specific embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of wearing a dust cumulative exposure monitoring device in an individual protection state in a specific embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of an expanded dust cumulative exposure monitoring device in an individual protection state in a specific embodiment of the present invention;

[0025] Figure markings: 1-shell, 101-first shell, 102 second shell, 103 third shell, 2-cavity, 3-air inlet, 4-air supply duct, 5-protective mask, 6-filter unit, 7-air supply unit, 8-dust measurement unit, 9-air supply duct interface, 10-control unit, 11-power supply, 12-accessory connection interface, 13-sealing strip. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0027] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] See also Figures 1 to 4 A specific embodiment of the present invention shows a dust cumulative exposure monitoring device in an individual protection state, comprising:

[0030] The housing 1 has a cavity 2 formed inside it; the housing 1 is formed by a first housing 101 and a second housing 102 which are arranged opposite to each other and protrude outward; the second housing 102 is provided with an air inlet 3 for air to enter the cavity 2; an air supply duct interface 9 is provided on the housing 1; when the wearer needs to use this device, the air supply duct 4 connected to the protective mask 5 is connected to the air supply duct interface 9 to form an air flow channel consisting of the housing 1, the air supply duct 4, and the protective mask 5. The user breathes the air entering this air flow channel through the air inlet 3, and the air flow direction is as follows Figure 3 As shown; the air supply duct interface 9 can be provided on the first shell 101 or the second shell 102, or can be provided at the connection between the first shell 101 and the second shell 102; the following electrical components are provided in the cavity 2:

[0031] The filter unit 6 is adjacent to the air inlet 3 and is used to filter dust in the air entering the cavity 2 from the air inlet 3 to reduce the amount of dust inhaled by the wearer;

[0032] The air supply unit 7 is located on the downwind side of the filter unit 6 and is used to increase the surrounding air pressure to form a wind flow. Under the action of the air supply unit 7, the air flow containing dust enters the device through the air inlet 3, and after the dust is filtered by the filter unit 6, a relatively fresh air supply flow is formed. The air supply flow is sent to the protective mask 5 along the air supply duct 4 for the user to breathe.

[0033] The dust measuring unit 8 is located on the downwind side of the filter unit 6 and is used to monitor the dust concentration of the air containing a small amount of dust after being filtered by the filter unit 6;

[0034] The control unit 10 uses the dust measurement unit 8 to obtain the dust concentration value after filtration, the air volume and the dust contact time to calculate the cumulative dust contact amount.

[0035] The power supply 11 is connected to the control unit 10 and provides power to the entire device.

[0036] In this embodiment, the filter unit 6 uses a polypropylene microfiber pleated filter element with a dust filtration efficiency of not less than 99% and a filtration accuracy of 0.1-0.3 μm. The pleated structure of the filter element is preferably V-shaped or U-shaped to increase the effective filtration area.

[0037] The air supply unit 7 uses a centrifugal blower. A motor drives the impeller to rotate at high speed, directing air to the desired location. The air volume is adjusted by adjusting the impeller speed. The preferred range of impeller speed is 6000 rpm to 15000 rpm, achieving an air volume of 70 L / min to 150 L / min.

[0038] The dust measurement unit 8 measures dust concentration using light scattering. Specifically, the air inlet of the dust measurement unit 8 faces the downwind side of the air flow, allowing dust in the air flow to pass through the light beam generated by the laser in the dust measurement unit 8, thereby causing light scattering. The dust concentration is calculated based on the intensity of the scattered light. The dust concentration measurement range of this measurement method is 0.01-10mg / m 3 , sensitivity is 0.01mg / m 3 .

[0039] The control unit 10 is connected to the air supply unit 7 and the dust measurement unit 8. After the device is turned on, the timer in the control unit 10 starts to measure the dust contact time, and then obtains the real-time dust concentration value and the real-time air supply volume value to calculate the average dust concentration in the air supply flow per unit time. Finally, the cumulative dust contact amount is calculated based on the average dust concentration, the air supply volume in each time period, and the cumulative contact time. The specific calculation formula is:

[0040]

[0041] Where: m Total is the cumulative exposure to dust, in mg. is the average dust concentration in the air flow during time period i, in mg / m 3 ; is the air volume in time period i, in L / min; t i For and The corresponding cumulative contact time, in minutes.

[0042] The control unit 10 can also be used for power on / off management of the equipment, air volume control of the air supply unit 7, and data storage and transmission.

[0043] The control unit 10 and the power supply 11 are fixed in an independent area in the housing 1 and isolated from other components by partitions to prevent dust and water vapor from entering and causing pollution.

[0044] The control unit 10 can also be used to manage the power supply 11; process data of the filter unit 6, control the wind speed of the air supply unit 7, and process the positioning information of the operator; and can also evaluate the protective strength of individual protective equipment through the dust concentration value monitored by the dust measurement unit 8. For example, a dust concentration threshold is set. If the dust concentration value exceeds this threshold, it means that the protective effectiveness of the filter unit 6 is weakened and cannot effectively filter the dust concentration in the air entering the equipment. At this time, the control unit 10 issues an alarm to remind you to replace the filter unit 6.

[0045] The filter unit 6 is set to be replaceable, and different filter units 6 can be replaced according to different air filtration requirements. For example, it can be replaced with a gas filter box or a dust filter membrane, or a filter unit 6 that integrates a gas filter box and a dust filter membrane, which can achieve simultaneous filtration of toxic gases and dust such as H2S and CO in coal mines.

[0046] If a gas monitoring unit is provided in the cavity 2 , on the wind side below the filter unit 6 , for detecting harmful gases in the air supply duct 4 , the device can also calculate the cumulative exposure amount of harmful gases.

[0047] like Figure 5The figure shows a schematic diagram of wearing a dust cumulative exposure monitoring device in an individual protection state in a specific embodiment of the present invention. When the device needs to be worn, an accessory connection interface 12 can be provided on the first shell 101, the second shell 102, or at the connection between the first shell 101 and the second shell 102. The accessory connection interface 12 is used to connect to a third-party accessory to secure the shell 1 to the user. When the device is worn on the head, the accessory connection interface 12 is connected to the headband or helmet; when the device is worn on the back, the accessory connection interface 12 is connected to a strap or vest; when worn on the waist, the accessory connection interface 12 is connected to the waist belt; when worn on the chest, the accessory connection interface 12 is connected to an accessory fixed to the chest.

[0048] The first housing 101 may also have a specific curvature to closely conform to the user's body curves, allowing the user to wear the device securely and comfortably. When the device is worn on the user's back, the first housing 101 has a curvature that fits the back; when the device is worn on the user's chest, the first housing 101 has a C-shaped curvature that fits the chest; when the device is worn on the user's waist, the first housing 101 has an S-shaped curvature that fits the waist; and when the device is worn on the user's head, the first housing 101 has a circular curvature that fits the head.

[0049] like Figure 6 Figure 1 is a schematic diagram of a dust cumulative exposure monitoring device in a personal protective state, according to a specific embodiment of the present invention. To achieve sealing of the edge of the housing 1, a sealing groove can be provided on the edge of the first housing 101 or the second housing 102 on the opposite side, and a sealing strip 13 can be placed in the sealing groove to achieve sealing between the first housing 101 and the second housing 102. Screw holes can also be provided on the edge of the first housing 101 or the second housing 102 on the opposite side, and screws can be used to tightly connect the first housing 101 and the second housing 102.

[0050] In order to facilitate opening the shell 1 to inspect or replace the components in the cavity 2, the shell 1 can be configured to be composed of a first shell 101, a second shell 102 and a third shell 103; the first shell 101 is arranged opposite to the second shell 102 and the third shell 103; the air inlet 3 is arranged on the third shell 103; when it is necessary to open the shell 1 to inspect the air supply unit 7, the dust measurement unit 8, the control unit 10 or the power supply 11, it is only necessary to remove the second shell 102; when it is necessary to open the shell 1 to replace the filter unit 6, it is only necessary to remove the third shell 103.

[0051] The present invention provides a solution for detecting the actual cumulative dust exposure level of workers in a protective state. The invention proposes a dust cumulative exposure monitoring device for individual protective states. The device is connected to an air supply duct 4 connected to a protective mask 5 via an air supply duct interface 9 to form an air flow channel. A filter unit 6, an air supply unit 7, a dust measurement unit 8, and a control unit 10 are provided within the device. The control unit uses the dust concentration value monitored by the dust measurement unit 8 to obtain the cumulative dust exposure. Because the dust measurement unit 8 is provided within the protective device to obtain the dust concentration in the air flow channel, real-time dynamic measurement of the dust concentration in the air flow is achieved. This is more accurate than the dust exposure concentration calculated using the mask protection factor in the protective state. Calculating the cumulative dust exposure using the dust concentration in the air flow channel better reflects the worker's actual level of dust exposure than calculating the cumulative dust exposure using the ambient dust concentration.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A dust cumulative exposure monitoring device under personal protection state, characterized in that: include: A housing (1); a cavity (2) is formed inside the housing (1); the housing (1) is formed by enclosing a first housing (101) and a second housing (102); an air inlet (3) is provided on the second housing (102) for allowing air to enter the cavity (2); an air supply duct interface (9) is provided on the housing (1), and when in use, the air supply duct interface (9) is connected to the air supply duct (4) connected to the protective mask (5) to form an air flow channel; The cavity (2) is provided with: a filter unit (6), adjacent to the air inlet (3), for filtering the air entering the cavity (2) through the air inlet (3); An air supply unit (7), located on the downwind side of the filter unit (6), is used to deliver filtered air along the air supply duct (4) to the protective mask (5); A dust measuring unit (8), located on the downwind side of the filter unit (6), is used to monitor the dust concentration value after being filtered by the filter unit (6); A control unit (10) is connected to the air supply unit (7) and the dust measurement unit (8); The power supply (11) is connected to the control unit (10) and provides power to the entire device.

2. The dust cumulative exposure monitoring device under personal protection according to claim 1, characterized in that: The filter unit (6) is a gas filter box or a dust filter membrane.

3. The dust cumulative exposure monitoring device under personal protection according to claim 1, characterized in that: In the cavity (2), a gas monitoring unit is provided on the downwind side of the filter unit (6), and is connected to the control unit (10).

4. The dust cumulative exposure monitoring device under personal protection according to claim 1, characterized in that: The first shell (101) has a curvature and closely fits the body curve of the user.

5. The dust cumulative exposure monitoring device in the personal protection state according to claim 1 is characterized in that: The housing (1) is also provided with an accessory connection interface (12), and the accessory connection interface (12) is used for connecting to a third-party accessory.

6. The dust cumulative exposure monitoring device under personal protection according to claim 1, characterized in that: The power supply (11) and the control unit (10) are fixedly arranged in an independent area within the cavity (2) and isolated from other components.

7. The dust cumulative exposure monitoring device in a personal protective state according to claim 1, characterized in that: The housing (1) is composed of a first housing (101), a second housing (102) and a third housing (103) respectively arranged opposite to the first housing (101); the air inlet (3) is arranged on the third housing (103).

8. The dust cumulative exposure monitoring device in a personal protective state according to claim 1, characterized in that: A sealing groove for placing a sealing strip (13) is provided on the edge of the opposite side of the first shell (101) or the second shell (102).

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