A device and method for detecting limited space environment in deep working area

Abstract

The present invention discloses a device and method for detecting the environment of a confined space in a deep working area, and relates to the technical field of gas detection in confined spaces. In the present invention: the detection device is equipped with an infrared camera and a distance sensing probe facing the operator, and the detection device is equipped with a sight for calibrating its installation orientation. The detection device is equipped with an air intake pipe head, a temperature sensing module for detecting the temperature of the inhaled air flow, and a humidity sensing module for detecting the humidity of the inhaled air flow. The detection device is equipped with a speaker, and the detection device is equipped with a controller, and the infrared camera, the distance sensing probe, the temperature sensing module, the humidity sensing module, the micro air flow pump and the speaker are all independently electrically connected to the controller. The flow rate sensor is connected to the controller by wireless transmission. The present invention reduces the time delay and fluctuation problems of the detection data caused by the rapid mixing and diffusion of gases due to human activities, and improves the accuracy of the detection of the gas in the surrounding environment of the operator.

Description

Technical Field

[0001] The present invention relates to the technical field of confined space gas detection, and in particular to a confined space environment detection device and a detection method for a deep operating area. Background Art

[0002] Harmful gases in confined spaces, such as gas and hydrogen sulfide in underground mines, can cause poisoning hazards to the human body. Hydrogen sulfide can irritate the human respiratory tract and eyes, and high concentrations can cause respiratory paralysis or even death. When the human body is active in such an environment, the risk of inhaling harmful gases increases with the increase in activity time and breathing frequency.

[0003] In order to avoid the above-mentioned dangers, when a human body enters a confined space, an environmental detection device will be used to detect the gas in the confined space and ventilate the space in real time to ensure the safety of personnel working in the confined space for a long time.

[0004] However, the rapid mixing and diffusion of gases caused by human activities may cause time delays and fluctuations in the detection data. For example, the large amplitude of the operator's body movements changes the direction and speed of the airflow in the confined space, which may prolong the residence time of harmful gases in local areas of the confined space. For gas detection devices, harmful gases may be detected some time after they are generated, resulting in time delays. Moreover, due to the intermittent and uncertain nature of human activities, the detected gas concentration will fluctuate up and down, affecting the judgment of the actual gas concentration.

[0005] If you want to directly improve the accuracy of gas detection around human activities, you can generally only configure gas detection devices at many locations around human activities to detect gas parameters at multiple locations around the human body and complete balanced gas parameter calculations. However, this method is relatively cumbersome to layout and is not suitable for dynamic and multi-operation location situations.

[0006] If the operator carries the detection device with him, the operator's clothing or posture may block the airflow sampling port of the detection device, resulting in untimely detection.

[0007] Therefore, when workers enter a confined space, how to conduct timely and accurate detection of the ambient gas around the workers without affecting their normal work and activities becomes a problem that needs to be solved. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a device and method for detecting the limited space environment in a deep working area, thereby reducing the time delay and fluctuation of the detection data caused by the rapid mixing and diffusion of gases due to human activities without the need for complicated detection position layout, and improving the accuracy of gas detection in the environment around the workers.

[0009] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0010] The present invention provides a device for detecting a limited space environment in a deep working area, comprising the following contents:

[0011] The deep working area is pre-configured with ventilation ducts and exhaust pipes, and the detection device is fixedly installed at the position of a tripod bracket pre-placed in the deep working area. The tripod bracket is configured with a mounting base for fixedly installing the detection device.

[0012] The detection device is equipped with an infrared camera and a distance sensor probe facing the operator, and is equipped with a sight for calibrating its installation orientation, wherein the aiming direction of the sight, the image acquisition direction of the infrared camera, and the distance detection direction of the distance sensor probe are in the same direction.

[0013] The detection device has a built-in micro airflow pump. The detection device is equipped with an air intake pipe head, a temperature sensing module for detecting the temperature of the inhaled airflow, and a humidity sensing module for detecting the humidity of the inhaled airflow. The detection device is equipped with a speaker, and the detection device is equipped with a controller. The infrared camera, distance sensor probe, temperature sensor module, humidity sensor module, micro airflow pump and speaker are all independently electrically connected to the controller. The exhaust pipe in the deep working area is equipped with a flow rate sensor for detecting the flow rate of ventilation gas, and the flow rate sensor is connected to the controller via wireless transmission. The controller is also equipped with a time unit, and the time unit is equipped with a timing module.

[0014] As a preferred technical solution of the detection device of the present invention: a rotation adjustment structure is arranged at the connection position between the bottom of the mounting base and the tripod bracket.

[0015] As a preferred technical solution of the detection device of the present invention: the controller is equipped with an infrared detection and analysis unit, which includes an infrared signal conversion module electrically connected to the infrared camera and an infrared information storage module for storing real-time infrared information of the human body.

[0016] As a preferred technical solution of the detection device of the present invention: the controller is equipped with a distance detection and analysis unit, which includes a distance signal conversion module electrically connected to the distance sensor probe and a distance information storage module for storing real-time human body distance information.

[0017] As a preferred technical solution of the detection device of the present invention: the detection device is built with a brushless DC motor (BLDC) for linearly driving the operation of the micro airflow pump.

[0018] The present invention provides a method for detecting a limited space environment in a deep operating area, comprising the following contents:

[0019] S1. After the operator arrives at the working area, he / she places the tripod, fixes the detection device on the mounting base, adjusts the mounting base, observes the sight, and aligns the sight's line with the center area of ​​the working area.

[0020] S2. Start the detection device, check the wireless connection status between the detection device and the flow rate sensor, check the infrared, distance, temperature, and humidity detection status of the detection device, and after ensuring that all functions of the detection device are normal, the operator can start the corresponding manual work in the working area.

[0021] S3. The infrared camera obtains the infrared image information of the human body in real time and transmits it to the controller. The distance sensor probe obtains the distance information of the human body in real time and transmits it to the controller. The controller analyzes the real-time human infrared thermal imaging height parameter H x , real-time human distance parameter L x .

[0022] S4. The temperature sensor module obtains the airflow temperature information in real time and transmits it to the controller. The humidity sensor module obtains the airflow humidity information in real time and transmits it to the controller. The flow rate sensor obtains the airflow rate information in real time and transmits it to the controller. The controller analyzes the real-time airflow temperature parameter T x , Real-time humidity parameter R x , Real-time airflow rate parameter V x .

[0023] S5. The controller calculates the height parameter H based on the real-time human infrared thermal imaging x , real-time human distance parameter L x , Real-time air flow temperature parameter T x , Real-time humidity parameter R x , Real-time airflow rate parameter V x and correlation coefficient, real-time control of the airflow suction power P of the detection device x .

[0024] S6. When the controller obtains the infrared heat height parameter H x Or human distance parameter L x Maintain the system preset time t max When there is no change, the controller controls the airflow suction power of the detection device to be changed from the real-time P x Increase to N*P x Where m≥N>1 and the parameter value F(N) of N∝timeout difference Δt, Δt is the time duration t max time interval.

[0025] As a preferred technical solution of the detection method of the present invention: when the airflow suction power of the detection device reaches m*P xWhen the detection device sends out an alarm message to remind the operator to move, the alarm message is lifted after the operator's body posture changes, and the airflow suction power of the detection device is restored to the real-time P x .

[0026] As a preferred technical solution of the detection method of the present invention: when the infrared camera or the distance sensor probe does not detect a human signal, the detection device sends an alarm message to prompt the operator to adjust the detection direction of the detection device. When the detection device obtains a human signal again, the alarm message is lifted.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention uses a variety of sensors (infrared camera, distance sensor probe, temperature sensor module, humidity sensor module, flow rate sensor) configured in the detection device to obtain relevant parameters (human infrared thermal imaging height parameter, human distance parameter, airflow temperature parameter, humidity parameter, airflow rate parameter) in real time, and adjusts the airflow suction power of the detection device in real time according to these parameters and correlation coefficients. This reduces the time delay and fluctuation of the detection data caused by the rapid mixing and diffusion of gases caused by human activities, and improves the accuracy of the detection of gases in the surrounding environment of the operator.

[0029] 2. The detection device and method of the present invention can adapt to various activities of workers in deep working areas, such as standing, squatting, moving, etc., by real-time adjustment of airflow suction power and timely issuance of alarm information, it can ensure that the ambient gas around the workers can be effectively detected in different working postures and activities, and is suitable for dynamic, multi-working position working environments.

[0030] 3. Compared with the traditional method of configuring multiple gas detection devices around human activities, the detection device and method of the present invention do not require complicated detection position layout and are more suitable for complex working environments in limited spaces in deep working areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the operator in the deep working area in the present invention.

[0032] Figure 2 Dynamic diagram of the detection device detecting human posture Figure 1 .

[0033] Figure 3 Schematic diagram of the main functional modules of the gas detection device of the present invention.

[0034] Figure 4 The impact on airflow movement when the operator stands up.

[0035] Figure 5 Dynamic diagram of the detection device detecting human posture Figure 2 .

[0036] Among them: 1-deep working area; 2-ventilation duct; 3-exhaust pipe; 4-triangular bracket, 401-mounting base; 5-detection device, 501-infrared camera, 502-distance sensor probe, 503-intake pipe head, 504-temperature sensor module, 505-humidity sensor module, 506-sight; 6-flow rate sensor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Example 1: Effect of human body posture on airflow in a confined space:

[0039] In a confined space, changes in human posture will affect the airflow in the space, which is mainly based on the principles of fluid mechanics. The human body can be regarded as an obstacle in a confined space. When the human posture changes, the relative shape and position relationship between the human body and the surrounding space changes, thereby interfering with the normal flow of airflow.

[0040] When a person stands in a confined space, the human body will significantly hinder the vertical airflow. In front of the human body, the airflow speed will decrease and the pressure will increase; on both sides and behind the human body, the airflow will form vortices.

[0041] On the contrary, when a person squats in a limited space, the human body's resistance to vertical airflow is reduced. In front of the human body, the airflow speed increases and the pressure decreases compared to when the human body is standing. On both sides and behind the human body, the degree of airflow vortex is greatly attenuated compared to when the human body is standing.

[0042] Embodiment 2: The present invention designs a device for detecting the limited space environment in a deep working area, and the specific structure and configuration are as follows:

[0043] Tripod Bracket:

[0044] Combination Figure 1 , Figure 3 The triangular bracket 4 provides a stable supporting platform for the entire detection device 5. Its design is based on the stability principle of the triangle. It can stand firmly in the complex environment of the deep working area 1 to ensure the normal operation of the detection device 5.

[0045] The mounting base 401 is the connection part between the detection device 5 and the tripod bracket 4. The rotation adjustment structure configured at the connection position between the bottom and the tripod bracket facilitates the adjustment of the horizontal angle of the detection device 5 so that the detection device 5 can be accurately aligned with the center area of ​​the working area. The upper surface of the mounting base 401 provides a flat and stable mounting surface for the detection device 5, ensuring that the detection device 5 will not shake or move during operation.

[0046] (ii) Detection device:

[0047] Combination Figure 3 The shell of the detection device 5 is made of a strong and corrosion-resistant material, such as engineering plastics, which can effectively protect the internal electronic components from external physical impact, moisture, chemical corrosion and other factors, ensuring that the detection device 5 can operate stably for a long time in a harsh deep working environment.

[0048] The infrared camera 501 can obtain infrared image information of the operator in real time. Its lens is made of special infrared optical materials, which can effectively penetrate the infrared rays emitted by the human body and capture clear thermal imaging images. The camera is equipped with a highly sensitive infrared sensor that can detect weak changes in infrared radiation and convert them into electrical signals for transmission to the controller. By analyzing the height parameters of the infrared thermal imaging of the human body, an important basis is provided for the airflow suction power control of the detection device 5.

[0049] The distance sensor probe 502 uses the ultrasonic or laser distance measurement principle to measure the distance between the detection device 5 and the operator in real time and obtain the human body distance parameter. It has high measurement accuracy and fast response speed, can accurately identify the position change of the operator in a complex environment, and timely feedback to the controller to adjust the airflow suction power to ensure the accuracy and timeliness of the detection.

[0050] The suction pipe head 503 is designed in a special shape, such as a trumpet shape, to increase the air intake area and improve the air intake efficiency. A fine filter is installed at its entrance to prevent dust, debris, etc. from entering the detection device 5, avoiding damage to the internal air flow sensor and micro air flow pump, while ensuring the purity of the inhaled air flow, ensuring that the temperature sensor module 504 and the humidity sensor module 505 can accurately detect the temperature and humidity parameters of the air flow.

[0051] The temperature sensing module 504 uses a high-precision thermistor or thermocouple sensor, which can quickly and accurately measure the temperature of the inhaled airflow and convert the temperature change into an electrical signal for transmission to the controller. It has a wide measurement range and can adapt to various temperature environments that may occur in the deep operating area 1, providing temperature parameters for the regulation of the airflow inhalation power to compensate for the influence of temperature on the detection results.

[0052] The humidity sensing module 505 usually adopts a capacitive or resistive humidity sensor, which can accurately measure the humidity content in the inhaled airflow and convert the humidity information into an electrical signal to send to the controller. It has high sensitivity to humidity changes and can work stably under different humidity conditions, providing real-time humidity parameters for the detection device 5 so that the controller can adjust the airflow inhalation power according to the humidity conditions to ensure detection accuracy.

[0053] The sight 506 is similar to an optical sight, and the center area of ​​the working area is imaged in the field of view of the sight 506 through the optical lens system, and its aiming direction is the same as the image acquisition direction of the infrared camera 501 and the distance detection direction of the distance sensor probe 502. When installing the detection device 5, the operator can easily aim the detection device 5 at the target area by observing the sight 506, ensuring the accuracy and effectiveness of the detection.

[0054] The micro airflow pump is the power source for the airflow inhaled by the detection device 5. It is driven by a brushless DC motor (BLDC) and has the advantages of high efficiency, low noise, and long life. The brushless DC motor (BLDC) achieves precise speed regulation through the control signal of the controller, thereby linearly driving the micro airflow pump to operate, and can adjust the airflow inhalation power according to actual needs, ensuring that the detection device 5 can obtain stable and accurate airflow samples for analysis under different working conditions.

[0055] The speaker is used to send out alarm information. When the detection device 5 detects an abnormal situation, such as the airflow suction power reaches a threshold or no human signal is detected, the controller will trigger the speaker to send out a sound alarm to remind the operator to take corresponding measures. The speaker has a large volume and clear sound quality, and can effectively convey alarm information in the noisy environment of the deep working area 1.

[0056] The controller is the core control unit of the detection device 5. It adopts a high-performance microprocessor chip and has a strong data processing capability and a fast response speed. It receives signals from the infrared camera 501, the distance sensor probe 502, the temperature sensor module 504, the humidity sensor module 505 and the flow rate sensor 6, and performs real-time data analysis and processing. According to the preset algorithm and correlation coefficient, the real-time airflow suction power is calculated, and the operation of the micro airflow pump, the alarm triggering of the speaker and other operations are controlled according to the detection results. At the same time, the time unit and its timing module configured in the controller are used to record various time parameters, such as the length of time that the infrared heat height parameter or the human body distance parameter remains unchanged, etc., to provide a time basis for abnormal processing. The controller also includes an infrared detection and analysis unit (including an infrared signal conversion module and an infrared information storage module) and a distance detection and analysis unit (including a distance signal conversion module and a distance information storage module), which further process and store the data of the infrared camera 501 and the distance sensor probe 502 respectively, so as to improve the intelligence level of the detection device 5.

[0057] (III) Exhaust pipe and flow rate sensor:

[0058] Combination Figure 1 The exhaust pipe 3 is used to discharge the gas in the deep working area 1 to maintain air circulation in the working space. Its material is usually a high temperature resistant and corrosion resistant metal pipe, which can withstand the high temperature and erosion of harmful gases that may be generated during the operation. The diameter and length of the exhaust pipe 3 are reasonably designed according to the size of the working area and the ventilation requirements to ensure good ventilation effect.

[0059] The flow velocity sensor 6 is installed on the exhaust pipe 3, and can detect the flow velocity of the ventilation gas in real time and obtain the airflow rate parameters. The flow velocity sensor 6 adopts advanced sensor technology, such as a hot wire wind velocity sensor or a Doppler flow velocity sensor, and has the characteristics of high precision, high reliability and low power consumption. The flow velocity sensor 6 transmits the measurement data to the controller of the detection device 5 in real time through a wireless transmission method (such as Bluetooth), and provides the key ventilation rate information for the controller to adjust the airflow suction power of the detection device 5, so as to ensure that the detection result can accurately reflect the actual situation of the ambient gas around the operator.

[0060] Embodiment 3: The present invention designs a method for detecting a limited space environment in a deep working area, and the specific steps and configuration contents are as follows:

[0061] Stage 1: Preparation

[0062] Before workers enter the deep working area, the deep working area has been ventilated and preliminary gas detection has been completed. Only after the detection results are safe can workers enter the deep working area. A gas detection device is also configured at the top of the exhaust pipe to detect the exhaust gas composition in real time.

[0063] Combination Figure 1 ,After the operator arrives at the working area, he places the tripod, fixes the detection device on the mounting base, adjusts the mounting base, observes the sight, and aligns the sight’s line with the center area of ​​the working area.

[0064] Stage 2: Start the testing phase:

[0065] Start the detection device, check the wireless connection status between the detection device and the flow rate sensor, check the infrared, distance, temperature, and humidity detection status of the detection device, and after ensuring that all functions of the detection device are normal, the operator can start corresponding manual work in the work area.

[0066] Stage 3: Data information acquisition stage:

[0067] Combination Figure 2 , Figure 4 , Figure 5, human body related data acquisition: the infrared camera obtains the human body infrared image information in real time and transmits it to the controller, the distance sensor probe obtains the human body distance information in real time and transmits it to the controller, and the controller analyzes the real-time human body infrared thermal imaging height parameter H x , real-time human distance parameter L x .

[0068] Airflow related data acquisition: The temperature sensor module obtains the airflow temperature information in real time and transmits it to the controller. The humidity sensor module obtains the airflow humidity information in real time and transmits it to the controller. The flow rate sensor obtains the airflow rate information in real time and transmits it to the controller. The controller analyzes the real-time airflow temperature parameter T x , Real-time humidity parameter R x , Real-time airflow rate parameter V x .

[0069] Step 4: Power control of inhaled airflow of the detection device:

[0070] The controller is based on the real-time human infrared thermal imaging height parameter H x , real-time human distance parameter L x , Real-time air flow temperature parameter T x , Real-time humidity parameter R x , Real-time airflow rate parameter V x and correlation coefficient, real-time control of the airflow suction power P of the detection device x .

[0071] Step 5: Exception handling:

[0072] Combination Figure 2 , Figure 5 When the controller obtains the infrared heat height parameter H x Or human distance parameter L x Maintain the system preset time t max When there is no change, the controller controls the airflow suction power of the detection device to be changed from the real-time P x Increase to N*P x Where m≥N>1 and the parameter value F(N) of N∝timeout difference Δt, Δt is the time duration t max time interval, such as the preset t max = 60s, when the controller obtains the infrared heat height parameter H x Or human distance parameter L x If there is no change for 60 seconds, the airflow suction power of the detection device is directly adjusted to N*P x (At this time, N is still at the lowest value of its own parameter range, for example, N=1.1). As time goes by, the controller obtains the infrared heat height parameter H x Or human distance parameter Lx If there is no change, the value of N will continue to increase (for example, N=1.2, 1.3, 1.4...) until it reaches the maximum value m.

[0073] When the airflow suction power of the detection device reaches m*P x When the detection device sends out an alarm message to remind the operator to move, the alarm message is lifted after the operator's body posture changes, and the airflow suction power of the detection device is restored to the real-time P x .

[0074] When the infrared camera or distance sensor probe does not detect a human signal, the detection device sends out an alarm message to prompt the operator to adjust the detection direction of the detection device. When the detection device obtains a human signal again, the alarm message is lifted.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting the limited space environment of a deep working area, wherein the deep working area (1) is pre-configured with a ventilation pipeline (2) and an exhaust pipe (3), characterized in that: The detection device (5) is fixedly mounted at the position of a tripod support (4) pre-placed in the deep operation area (1), and the tripod support (4) is provided with a mounting base (401) for fixedly mounting the detection device (5); The detection device (5) is provided with an infrared camera (501) and a distance sensor probe (502) facing the operator, and the detection device (5) is provided with a sighting device (506) for calibrating its installation orientation, wherein the aiming direction of the sighting device (506), the image acquisition direction of the infrared camera (501), and the distance detection direction of the distance sensor probe (502) are in the same direction; The detection device (5) has a built-in micro air flow pump; The detection device (5) is equipped with an air intake pipe head (503), a temperature sensing module (504) for detecting the temperature of the inhaled air flow, and a humidity sensing module (505) for detecting the humidity of the inhaled air flow; The detection device (5) is provided with a loudspeaker; The detection device (5) is equipped with a controller, and the infrared camera (501), the distance sensor probe (502), the temperature sensor module (504), the humidity sensor module (505), the micro airflow pump and the speaker are all independently electrically connected to the controller; The exhaust pipe (3) of the deep working area (1) is provided with a flow rate sensor (6) for detecting the flow rate of ventilation gas, and the flow rate sensor (6) is connected to the controller via wireless transmission; The controller is provided with a time unit, and the time unit is provided with a timing module; The controller obtains real-time human thermal imaging information from the infrared camera (501), real-time human distance information from the distance sensor probe (502), real-time temperature information from the temperature sensor module (504), real-time humidity information from the humidity sensor module (505), real-time air flow rate information from the flow rate sensor (6) and the correlation coefficient, and controls the real-time output power of the micro air flow pump.

2. The device for detecting a limited space environment in a deep working area according to claim 1, characterized in that: A rotation adjustment structure is arranged at the connection position between the bottom of the mounting base (401) and the tripod bracket (4).

3. The device for detecting a limited space environment in a deep working area according to claim 1, characterized in that: The controller is equipped with an infrared detection and analysis unit, which comprises an infrared signal conversion module electrically connected to the infrared camera (501) and an infrared information storage module for storing real-time infrared information of the human body.

4. The device for detecting a limited space environment in a deep working area according to claim 1, characterized in that: The controller is equipped with a distance detection and analysis unit, which comprises a distance signal conversion module electrically connected to the distance sensing probe (502) and a distance information storage module for storing real-time human body distance information.

5. The device for detecting a limited space environment in a deep working area according to claim 1 is characterized in that: The detection device (5) has a built-in brushless direct current motor (BLDC) for linearly driving the operation of the micro air flow pump.

6. A method for detecting a limited space environment in a deep working area, characterized in that: The deep working area limited space environment detection device according to any one of claims 1 to 5 comprises the following contents: S1. After the operator arrives at the working area, he places the tripod (4), fixes the detection device (5) on the mounting base (401), adjusts the mounting base (401), observes the sight (506), and aligns the sight (506) with the center area of ​​the working area; S2. Start the detection device (5), check the wireless connection status between the detection device (5) and the flow rate sensor (6), check the infrared, distance, temperature, and humidity detection status of the detection device (5), and after ensuring that the functions of the detection device (5) are normal, the operator can start to perform corresponding manual operations in the operation area; S3. The infrared camera (501) obtains the infrared image information of the human body in real time and transmits it to the controller. The distance sensor probe (502) obtains the distance information of the human body in real time and transmits it to the controller. The controller analyzes the real-time infrared thermal imaging height parameter H of the human body. x , real-time human distance parameter L x ; S4. The temperature sensing module (504) obtains the airflow temperature information in real time and transmits it to the controller, the humidity sensing module (505) obtains the airflow humidity information in real time and transmits it to the controller, the flow rate sensor (6) obtains the airflow rate information in real time and transmits it to the controller, and the controller analyzes the real-time airflow temperature parameter T x , Real-time humidity parameter R x , Real-time airflow rate parameter V x ; S5. The controller calculates the height parameter H based on the real-time human infrared thermal imaging x , real-time human distance parameter L x , Real-time air flow temperature parameter T x , real-time humidity parameter R x , Real-time airflow rate parameter V x and correlation coefficient, real-time control of the airflow suction power P of the detection device x ; S6. When the controller obtains the infrared heat height parameter H x Or human distance parameter L x Maintain the system preset time t max When there is no change, the controller controls the airflow suction power of the detection device (5) to be changed from the real-time P x Increase to N*P x ; Where m≥N>1 and the parameter value F(N) of N∝timeout difference Δt, Δt is the time duration t max time interval.

7. A method for detecting a limited space environment in a deep working area according to claim 6, characterized in that: When the airflow suction power of the detection device (5) reaches m*P x When the detection device (5) sends out an alarm message to prompt the operator to move. After the operator's body posture changes, the alarm message is released, and at the same time, the airflow suction power of the detection device (5) is restored to the real-time P x .

8. A method for detecting a limited space environment in a deep working area according to claim 6, characterized in that: When the infrared camera (501) or the distance sensor probe (502) does not detect a human body signal, the detection device (5) issues an alarm message to prompt the operator to adjust the detection orientation of the detection device (5); when the detection device (5) acquires a human body signal again, the alarm message is released.

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