Dust accumulation contact amount monitoring device and method in individual protection state

Abstract

The invention provides a scheme capable of monitoring the current protection state of an operator and reflecting the real dust accumulation contact level of the operator according to the protection state. According to the dust accumulation contact amount monitoring device in the individual protection state, the air supply pipeline is communicated with the protection mask, so that an air channel is provided for a user; on one hand, a pressure measuring unit is arranged in the equipment and used for monitoring airflow pressure in an air supply pipeline and judging the protection state of a user; on the other hand, a dust measuring unit is arranged in the equipment and used for monitoring the dust concentration of the filtered air for the user to inhale; and calculating the accumulated dust contact amount in the corresponding protection state by utilizing the environment dust concentration or the filtered dust concentration. Automatic detection of operators in a protection state and a non-protection state is realized, accurate measurement of the contact time in calculation of the accumulated dust contact amount is improved, and the real level of the operators in contact with dust can be better reflected.

Description

Technical Field

[0001] The present invention relates to the technical field of respirable dust detection in coal mines, and in particular to a device and method for monitoring the cumulative dust contact amount in an individual protection state. Background Art

[0002] During coal mining operations, a large amount of dust will be generated, and it may be accompanied by the presence of harmful gases such as hydrogen sulfide. Therefore, it is of great significance to continuously and accurately monitor the dust exposure of workers. Many researchers have conducted research on the monitoring of dust exposure. Invention application WO2019128184A1 proposes a method and test system for calculating the cumulative dust exposure of mining workers. Based on the distribution of respiratory dust concentration, wind flow distribution and personnel spatiotemporal trajectory data, a multi-level cumulative mathematical model is constructed. Considering the changes in dust concentration at different times and locations and the movement paths of personnel, the individual respiratory dust exposure is predicted to realize the calculation of the cumulative value of the dust concentration in the environment to which the workers are exposed. However, when the workers are protected by masks, it cannot truly reflect the actual dust exposure of the workers. Invention application CN116256289A proposes a respirable dust measurement unit based on miners' lungs. For the dynamically changing underground dust, a respirable dust measurement unit based on miners' lungs includes an upper airflow pipeline system, a filter membrane clamping structure and a lower breathing switching simulation system. The two ends of the filter membrane clamping structure are respectively connected to the airflow pipeline system and the breathing switching simulation system. The cumulative dust exposure of miners at different operating points is quantitatively evaluated. However, it does not take into account the calculation of the actual dust exposure amount when miners wear masks with protective conditions in actual operations. On the one hand, general operators may wear dust protection masks during operation, and may remove the masks when they are uncomfortable to wear. There is uncertainty about whether to wear protective masks or not. Therefore, the method of monitoring dust exposure by only considering the dust concentration in the environment cannot reflect the actual level of dust exposure of operators; on the other hand, as the amount of dust intercepted by the mask increases, the mask protection factor and dust interception rate are also changing, which makes the method of calculating dust exposure by the protection factor also unable to reflect the actual level of dust exposure of operators. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a solution that can monitor the current protection status of the operator and obtain the actual dust accumulation exposure level according to the protection status. In view of this, the purpose of the present invention is to provide a dust accumulation exposure monitoring device and method under individual protection status.

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

[0005] A dust cumulative contact monitoring device in an individual protection state comprises: a shell; a cavity is formed inside the shell, and an air inlet is provided on the shell; when in use, the shell is connected with the protective mask through an air supply duct to form an air flow channel; the cavity is provided with:

[0006] A filter unit, adjacent to the air inlet, for filtering the air entering the cavity from the air inlet;

[0007] 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;

[0008] The dust measurement unit is located on the downwind side of the filter unit and is used to monitor the dust concentration of the air after it has been filtered by the device;

[0009] A pressure measuring unit, located at a certain distance from the air supply duct, is used to monitor the air flow pressure in the air supply duct;

[0010] A control unit is used to obtain the air flow pressure value in the air supply duct to determine whether the user wears the protective mask; according to the wearing condition, the corresponding dust cumulative contact amount is calculated using the ambient dust concentration or the dust concentration after filtering by the device, and the dust contact time;

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

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

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

[0014] Whether the operator is wearing a protective mask is determined by measuring the pressure of the airflow in the air supply duct, which realizes automatic detection of the operator in the protective state and the non-protective state, improves the accurate measurement of the contact time in the calculation of the cumulative dust contact amount, and reflects the actual level of dust exposure of the operator.

[0015] Furthermore, the filter unit in the device is replaceable, and the user can replace the corresponding filter unit according to different scenarios; the control unit can also evaluate the effectiveness of individual protective equipment based on changes in dust concentration values ​​in the air supply flow, and remind users to replace the filter unit.

[0016] The present invention also provides a method for monitoring the cumulative dust exposure under individual protection conditions, which is achieved by the following steps:

[0017] Determine whether the operator has entered the dusty operation area;

[0018] According to the situation of workers entering the dusty working area, calculate the dust contact time, specifically:

[0019] If the workers are not in the dusty working area, there is no need to calculate the cumulative dust exposure time; if the workers are in the dusty working area, the cumulative dust exposure time of the workers entering the dusty working area needs to be calculated.

[0020] Determine whether the operator is wearing a protective mask, specifically:

[0021] By obtaining the airflow pressure value in the airflow channel for the operator to breathe on the protective device, it is determined whether the operator is wearing a mask.

[0022] The cumulative dust exposure is calculated based on the condition that the workers wear masks, specifically:

[0023] When the workers are not wearing protective masks, the cumulative dust exposure is calculated based on the dust concentration in the environment where the workers are located and the cumulative dust exposure time; when the workers are wearing protective masks, the cumulative dust exposure is calculated based on the dust concentration and the cumulative dust exposure time in the protective state.

[0024] The beneficial effects of the present invention are:

[0025] According to whether the workers are wearing protective masks, the cumulative dust exposure of those who are not wearing protective masks can be calculated through the ambient dust concentration; the cumulative dust exposure of those who are wearing protective masks can be calculated through the dust concentration in the protective state. The cumulative dust exposure calculated in this way is more accurate and can reflect the actual level of dust exposure of the workers.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the external structure of a dust cumulative contact monitoring device in an individual protection state in a specific embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal space of a dust cumulative contact monitoring device in an individual protection state in a specific embodiment of the present invention;

[0030] 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 present invention;

[0031] Figure 4 It is a schematic structural diagram of a dust cumulative contact monitoring device in an individual protection state according to a specific embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of wearing a dust cumulative contact monitoring device in an individual protection state in a specific embodiment of the present invention;

[0033] Figure 6 It is a flow chart of a method for monitoring dust cumulative exposure under individual protection state in a specific embodiment of the present invention;

[0034] Figure markings: 1-shell, 2-cavity, 3-air inlet, 4-air supply duct, 5-protective mask, 6-filter unit, 7-air supply unit, 8-dust measuring unit, 9-pressure measuring unit, 10-control unit, 11-power supply, 12-accessory connection interface. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] 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 the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position 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.

[0038] like Figure 1 to Figure 4 As shown, a dust cumulative contact monitoring device in an individual protection state is shown in a specific embodiment of the present invention, comprising:

[0039] Shell 1 and cavity 2; Shell 1 is composed of two shells that are arranged opposite to each other and protrude outward, and the hollow part is cavity 2; Shell 1 is provided with an air inlet 3 for air to enter cavity 2; When the user needs to wear this device, the shell 1 is connected with the protective mask 5 through the air supply duct 4, thereby, the cavity 2, the air supply duct 4 and the protective mask 5 are in a connected state, forming an air flow channel for the user to breathe; The air supply interface can be provided on the shell 1 for connecting the air supply duct 4;

[0040] The following electrical components are arranged in cavity 2:

[0041] 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;

[0042] 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 along the air inlet 3, and forms a relatively fresh wind flow after the dust is filtered by the filter unit 6. The air is sent to the protective mask 5 along the air supply duct 4 for the user to breathe.

[0043] The dust measuring unit 8 is located at 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;

[0044] The pressure measuring unit 9 is located at a certain distance from the air supply duct 4 and is used to measure the air flow pressure value in the air supply duct 4;

[0045] Control unit 10: used to obtain the air flow pressure value in the air supply duct 4 through the pressure measuring unit 9 to determine whether the user wears a mask; according to the mask wearing condition, the dust measuring unit 8 is used to obtain the dust concentration value after filtration or the environmental dust concentration value, and the dust contact time to calculate the corresponding dust cumulative contact amount; wherein the environmental dust concentration value can be obtained through an environmental dust concentration sensor or a handheld individual dust measuring instrument;

[0046] The power supply 11 is connected to the control unit 10 and provides power to the entire device.

[0047] 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 changes in the dust concentration value in the air supply duct 4, such as setting a dust concentration threshold. When the dust concentration value in the air supply duct 4 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 device. At this time, the control unit 10 issues an alarm to remind the replacement of the filter unit 6.

[0048] The control unit 10 and the power supply 11 may also be fixed in an independent area within the housing 1 and isolated from other components by a partition to prevent dust, water vapor and other pollutants from entering and causing pollution.

[0049] The filter unit 6 is set to be replaceable. 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. This can achieve simultaneous filtration of toxic gases and dust such as H2S and CO in coal mines.

[0050] A gas monitoring unit may also be provided in the cavity 2, at the wind side below the filter unit 6, for detecting harmful gases in the air supply duct 4, so as to calculate the cumulative contact amount of harmful gases.

[0051] like Figure 5 The figure is a schematic diagram of wearing a dust cumulative contact monitoring device in an individual protection state in a specific embodiment of the present invention. When the device is worn, an accessory connection interface 12 is also provided on the side of the shell 1 close to the user's body. The accessory connection interface 12 is used to connect with a third-party accessory to stabilize the shell 1 on 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 the 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 the accessory fixed on the chest.

[0052] The side of the shell 1 close to the user's body may also have a specific curvature so as to fit closely with the user's body curve, so that the user can wear the device stably and comfortably. When the device is worn on the user's back, the side of the shell 1 close to the user's body has a curvature that fits the back; when the device is worn on the user's chest, the side of the shell 1 close to the user's body has a C-shaped curvature that fits the chest; when the device is worn on the user's waist, the side of the shell 1 close to the user's body has an S-shaped curvature that fits the waist; when the device is worn on the user's head, the side of the shell 1 close to the user's body has a circular curvature that fits the head.

[0053] The present invention also proposes a method for monitoring the cumulative dust exposure under individual protection conditions. Figure 6 ,like Figure 6 FIG. 1 is a flow chart of a method for monitoring dust cumulative exposure in an individual protection state in a specific implementation manner, the method comprising:

[0054] S1. Determine whether the operator has entered the dusty working area:

[0055] The positioning information of the operator is obtained to determine whether the operator is in the dusty working area. If the operator is not in the dusty working area, there is no need to calculate the accumulated dust exposure. If the operator is in the dusty working area, the accumulated dust exposure needs to be calculated, and the time calculation program is started to calculate the time when the operator enters the dusty working area. The positioning information of the operator can be obtained through the control unit 10 in the device for monitoring the accumulated dust exposure, or through a locator carried by the operator or a work area positioning system.

[0056] S2. Determine whether the operator is wearing a protective mask, specifically:

[0057] By obtaining the airflow pressure value in the airflow channel for the operator to breathe on the protective device, it is determined whether the operator is wearing a mask.

[0058] The device for monitoring the cumulative dust contact amount is connected to the protective mask through the air supply duct to form an air passage for the user to breathe. When the operator is not wearing a dust protective mask, the air flow cross-sectional area at the air flow outlet end of the air supply duct is large, the vortex and turbulence are small, and the air flow resistance in the duct is small. At this time, the air flow pressure in the air supply duct becomes smaller; on the contrary, when the operator is wearing a dust protective mask, the air flow cross-sectional area at the air flow outlet end of the air supply duct is small, the vortex and turbulence are large, and the air flow resistance in the air supply duct is large. At this time, the air flow pressure in the air supply duct becomes larger. Therefore, the condition of the operator wearing a mask can be judged according to the air flow pressure value in the air supply duct. For example, a pressure threshold is set, and the air flow pressure in the air supply duct is compared with the set pressure threshold. When the air flow pressure measurement value is less than the set threshold, it is judged that the operator is not wearing a dust protective device; when the air flow pressure measurement value is greater than or equal to the set threshold, it is judged that the operator is wearing a dust protective device. A certain range of pressure values ​​can also be set. When the air flow pressure in the air supply duct meets the set pressure value range, it is judged that the operator has worn the dust protection device. The air flow pressure value in the air supply duct can be measured by setting a pressure measurement unit on the device for monitoring the cumulative dust contact amount.

[0059] S3. Calculate the cumulative exposure to dust:

[0060] The cumulative dust exposure D is calculated by the following formula ce .

[0061]

[0062] In the formula, c i The dust concentration value at each measurement frequency; is the average respiratory flow of the operators, obtained through methods such as vital capacity test and ventilation function test; t i is the dust contact time; i is the measurement frequency of dust contact.

[0063] S31. When the operator does not wear a protective mask, the cumulative dust exposure is calculated based on the dust concentration in the environment where the operator is without protection. The dust concentration value c i It can be obtained through an ambient dust concentration sensor or a handheld personal dust measuring instrument.

[0064] S32. When the operator is wearing a protective mask, the cumulative dust exposure is calculated by the dust concentration after the protective device filters the dust when the operator is in a protected state. The dust concentration value c i It can be measured by the dust measurement unit in the protective equipment worn by the operator.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention 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 present invention.

Claims

1. A dust cumulative contact monitoring device under individual protection status, characterized in that: include: A shell (1); a cavity (2) is formed inside the shell (1), and an air inlet (3) is provided on the shell (1); when in use, the shell (1) is connected to the protective mask (5) through the air supply duct (4) 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) from the air inlet (3); An air supply unit (7), located on the downwind side of the filter unit (6), and used to deliver filtered air along the air supply duct (4) to the protective mask (5); A dust measurement unit (8), located on the downwind side of the filter unit (6), is used to monitor the dust concentration of the air after it is filtered by the device; A pressure measuring unit (9), located at a certain distance from the air supply duct (4), for monitoring the air flow pressure in the air supply duct; A control unit (10) is used to obtain the air flow pressure value in the air supply duct (4) to determine whether the user is wearing the protective mask (5); according to the wearing condition, the corresponding dust cumulative contact amount is calculated using the ambient dust concentration or the dust concentration after filtering by the device, and the dust contact time; The power supply (11), connected to the control unit (10), provides power to the entire device.

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

3. The dust cumulative exposure monitoring device under individual protection state according to claim 2, characterized in that: The control unit (10) prompts the user to replace the filter unit (6) when the dust concentration monitoring value reaches a certain threshold.

4. The dust cumulative exposure monitoring device under individual protection state according to claim 1, characterized in that: A gas monitoring unit is also provided in the cavity (2) at the downwind side of the filter unit (6), and interacts with the control unit (10) to calculate the cumulative contact amount of harmful gases.

5. The dust cumulative exposure monitoring device under individual protection state according to claim 1, characterized in that: The shell (1) has a specific curvature and fits closely with the body curve of the user.

6. The dust cumulative exposure monitoring device under individual protection state according to claim 1, 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.

7. The dust cumulative exposure monitoring device under individual protection state according to claim 1, characterized in that: The control unit (10) is also used to control the air supply unit (7) to adjust the air supply volume.

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

9. A method for monitoring the cumulative exposure to dust under individual protection, characterized in that: This is accomplished by following these steps: Determine whether the operator has entered the dusty operation area; According to the situation of workers entering the dusty working area, calculate the dust contact time, specifically: If the operator is not in the dusty working area, there is no need to calculate the cumulative dust exposure time; if the operator is in the dusty working area, the cumulative dust exposure time of the operator entering the dusty working area needs to be calculated; Determine whether the operator is wearing a protective mask, specifically: By obtaining the airflow pressure value in the airflow channel for the operator to breathe on the protective device, it is determined whether the operator is wearing a mask; The cumulative dust exposure is calculated based on the condition that the workers wear masks, specifically: When the workers are not wearing protective masks, the cumulative dust exposure is calculated based on the dust concentration in the environment where the workers are located and the cumulative dust exposure time; when the workers are wearing protective masks, the cumulative dust exposure is calculated based on the dust concentration and the cumulative dust exposure time in the protective state.

10. The method for monitoring dust cumulative exposure under individual protection state according to claim 9, characterized in that: The dust cumulative exposure is calculated by the following formula: Where D ce is the cumulative exposure to dust, c i For each dust concentration value at each measurement frequency, is the average respiratory flow rate of the operator, t i is the dust contact time, and i is the measurement frequency of dust contact.

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