Ventilation and detection integrated equipment and operation method

Abstract

The invention discloses ventilation and detection integrated equipment and an operation method, and relates to the field of limited space operation safety risk protection. The ventilation system comprises a draught fan, a special-shaped connector, a special-shaped air pipe and a ventilation straight piece, and a supporting structure of the special-shaped air pipe is a uniform-section oval keel. The detection system is provided with a sensor, an air pump, a sampling pipe, a wireless communication module and a detection directly-attached part, and the gas sampling pipe can be attached to the oval air pipe. The control system comprises an electric control box shell, a circuit board and a direct control piece of the circuit board, the circuit board is provided with a main control unit, the output of the main control unit is connected with a voice module and a display module, the electric control box shell is installed on the side wall of the fan, and the direct control piece comprises a touch display screen used for inputting and displaying real-time dynamic information. According to the invention, ventilation automation control based on gas detection result grading is realized, violation operation of operators is avoided, ordered operation is ensured, human intervention and misjudgment are reduced, and operation accuracy and safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety risk protection for confined space operations, and in particular to a ventilation detection integrated device and an operation method. Background Art

[0002] Confined space refers to a space that is closed or partially closed, with limited access but accessible to people, not designed as a fixed workplace, poorly ventilated, and prone to accumulation of toxic and harmful, flammable and explosive substances or insufficient oxygen content. As a common workplace, confined space has various forms and is widely used in many industries such as public facility management, production and supply of electricity, heat, gas and water, manufacturing, construction, service, property management, accommodation and catering. At the same time, it is also a special workplace, generally with a relatively small environment and poor ventilation, which is prone to accumulation of toxic and harmful, flammable and explosive substances or insufficient oxygen content. Whether it is routine operation in a confined space or emergency rescue in an accident state, there are great risks. Once illegal operations or improper rescue occur, casualties are very likely to occur.

[0003] In order to curb the frequent occurrence of related accidents, relevant government departments have also successively issued various laws and regulations, and made strict regulations on confined space operations, aiming to reduce the accident rate of confined space operations, standardize operating procedures, and reduce the occurrence of production safety accidents. Among them, strictly abiding by operating specifications and conducting ventilation tests before operations are effective safety measures.

[0004] According to the relevant requirements of safety management regulations, the fundamental measure to prevent accidents in confined space operations is to strictly abide by the principle of "ventilation first, then detection, and then operation" in confined space operations. According to statistics, the main reason for accidents in confined space operations is that construction workers do not comply with operating procedures and operate in violation of regulations. At present, there are a wide variety of gas detection alarms and ventilation equipment on the market, but detection and ventilation are two independent sets of equipment. During operation, operators need to operate a single device. In actual use, ventilation and detection operations often need to be repeated alternately, which is time-consuming and laborious. In addition, since a wide variety of equipment needs to be carried during operation, there will be omissions when carrying them to the site. Therefore, it is necessary to integrate and develop protective equipment that integrates ventilation and detection, realize the integration of detection and ventilation, and automatic control of ventilation time, improve the degree of automation of operations, reduce the burden on operators, further promote the implementation of safety protection measures for confined space operations, eliminate illegal operations by operators, reduce human intervention and misjudgment, and improve the accuracy and safety of operations. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an integrated ventilation detection device and operating method, thereby eliminating the phenomenon of illegal operations by operators, ensuring the orderly development of operations, reducing human intervention and misjudgment, and improving operation accuracy and safety.

[0006] The present invention is achieved through the following technical solutions:

[0007] A ventilation detection integrated device comprises a ventilation system, a detection system and a control system.

[0008] The ventilation system includes a fan, a special-shaped air duct joint, a special-shaped flexible air duct and ventilation accessories, wherein the supporting structure of the special-shaped flexible air duct is an elliptical keel with a uniform cross-section, and the material of the special-shaped flexible air duct is a PVC flexible material.

[0009] The detection system is equipped with a gas detection sensor, an air pump, a gas sampling tube, a wireless transmission module and its detection accessories. The gas detection sensor, the air pump, the wireless transmission module and its detection accessories are integrated into a detector, and the gas sampling tube is attached to the oval air duct.

[0010] The control system includes an electric control box housing, a circuit board and its control components, wherein the circuit board is equipped with a main control unit, which has built-in electric control software developed based on the hazard classification standard for confined space operations, and the output of the main control unit is connected to a voice module and a display module.

[0011] The gas detection sensor, air pump and its detection accessories in the detection system constitute the detector and are integrated in the electric control box shell. The electric control box shell is installed on the side wall of the fan. The control accessories include a touch screen for inputting and displaying real-time dynamic information.

[0012] Preferably, the fan is a mobile axial flow explosion-proof fan with a diameter of 310 mm.

[0013] Preferably, the gas detection sensor is connected to the sampling tube, the sampling tube extends into the limited space, and the gas detection sensor is connected to the electric control box via Loar wireless transmission.

[0014] Preferably, the main control unit is connected to the fan electronic control via a relay configured in the electronic control box.

[0015] An operating method of a ventilation detection integrated device includes the following contents:

[0016] First, before the operation, enter the relevant information through the touch screen of the equipment as the basic data for subsequent gas detection and environmental level judgment.

[0017] Second, different inspection points such as the upper, middle and lower parts of the confined space workplace are inspected. Based on the inspection results, mechanical ventilation is started when the environment is not level 3, and the ventilation time is calculated based on the parameters.

[0018] Third, after ventilation is completed, gas detection is performed again: if the detection results meet the safety requirements of the operation, the display module lights up the green release light, allowing the operator to enter the confined space for operation, and gives the operator a safety protection reminder through voice. If the gas concentration still exceeds the standard, the sound and light alarm is activated, and the test is performed again after ventilation for a period of time until the gas meets the standard, ensuring that the air quality in the confined space meets the safety standard before the operation.

[0019] Fourth, when workers enter a confined space to work, the integrated ventilation detection equipment enters the ventilation monitoring state during operation. The equipment provides two modes, continuous ventilation and intermittent ventilation, for users to choose. When it detects that the environmental concentration exceeds the standard, it automatically controls the fan to start, and prompts people to leave the confined space through voice.

[0020] The specific contents of the above-mentioned operation method are as follows:

[0021] Step 1: Initial Preparation

[0022] S1. Place the integrated ventilation detection equipment outside the confined space, in a suitable location where the air is clean and flows smoothly, and connect the special-shaped air duct connector, special-shaped flexible air duct and gas sampling tube.

[0023] S2. After completing the equipment layout, connect the power supply and perform the "power on" operation, that is, turn on the fan and detector respectively to prepare for subsequent testing and ventilation work.

[0024] S3. The equipment guides the operators through voice to input the relevant parameters of the volume and number of openings of the confined space on the touch screen, select whether there may be toxic and harmful, flammable and explosive gas outbursts, or sudden hypoxia and related assessment results during the operation, and determine the hazard classification of the confined space operation based on the volume-related parameter results combined with the gas detection results in the well. Based on the classification results, the ventilation time is adjusted using the built-in program.

[0025] Step 2: Start initial testing and evaluation

[0026] S4. Perform "upper gas detection" to detect the gas in the upper area of ​​the limited space: if the upper gas detection is not completed, continue the upper gas detection until the detection is completed, and then proceed to the next step.

[0027] S5. After the upper gas detection is completed, the "middle gas detection" is carried out to detect the gas in the middle area of ​​the limited space: if the middle gas detection is not completed, the middle gas detection is continued until the detection is completed, and then enter the next link.

[0028] S6. After the middle gas detection is completed, start "detecting the lower gas" and detect the gas in the lower area of ​​the limited space: if the lower gas detection is not completed, continue the detection until the lower gas detection is completed, and then enter the "determine the environmental level" step.

[0029] Step 3: Work environment assessment and ventilation control

[0030] S7. Determine the environmental level of the confined space based on the detection results of the upper, middle and lower gases:

[0031] When the judgment results of the detection data of the upper, middle and lower gases are all "Level 3", the "voice prompt corresponding operation" link will be entered. The equipment will prompt the operators through voice to carry emergency escape respirators, wear full-body safety belts, wear safety helmets and related protective equipment to enter confined space operations.

[0032] When the judgment result of any detection data of the upper, middle and lower gases is "non-level three", or after starting the machine, you select "whether there may be toxic and harmful, flammable and explosive gases, or sudden hypoxia during the operation", then enter the "ventilation" link, and calculate the ventilation time with 8 times the air exchange volume according to the structural parameters input after starting the machine, start ventilation operation on the confined space, and place the air duct in the lower part of the confined space for mechanical ventilation.

[0033] When any of the detection data of the upper or middle gas exceeds the standard, that is, the first-level environment, no subsequent detection will be carried out and the "ventilation" stage will be entered directly.

[0034] S8. After ventilation is completed, follow the voice prompts to perform the following gas detection steps:

[0035] S8.1. "Check the upper gas" again. If it is not completed, continue the check. When it is completed, proceed to the next step.

[0036] S8.2. Then proceed to "detect the middle gas". Continue the detection if it is not completed. Go to the next step after completion.

[0037] S8.3. Then "detect the lower gas". If it is not completed, continue the detection. After completion, enter the "determine the environmental level" step again.

[0038] S9. Re-evaluate the environmental level based on the upper, middle and lower gas results after ventilation:

[0039] S9.1. When the judgment result of any of the upper, middle and lower gas detection data is "level one", return to continue "ventilation" and repeat the gas detection steps in the above ventilation process until the environmental level is no longer "level one".

[0040] S9.2. When the judgment result of any of the upper, middle and lower gas detection data is "non-level one", the "voice prompt corresponding operation" link will be entered. The equipment will prompt the operator to take corresponding operation measures according to the current environmental level through voice:

[0041] Among them, when the judgment results of the detection data of the upper, middle and lower gases are all "level three", the "voice prompt corresponding operation" link will be entered. The equipment will prompt the operators through voice to carry emergency escape respirators, wear full-body safety belts, wear safety helmets and related protective equipment to enter confined space operations.

[0042] Among them, when the judgment result of any detection data of the upper, middle and lower gases is "Level 2", the "voice prompt corresponding operation" link will be entered. The equipment will prompt the operators through voice to carry positive pressure isolation respiratory protection equipment, wear full-body safety belts, wear safety helmets and related protective equipment to enter confined space operations.

[0043] S10. Finally, during the operation, when the gas detection alarm continues to detect gas, the fan will be automatically turned on every 5 minutes if the intermittent ventilation meets the test data; if the test result is unqualified, the fan will be immediately started to ventilate during the operation, and the external operator will be prompted by voice: if the working environment is dangerous, when the ventilation is turned on, the equipment will prompt the operator to take corresponding evacuation operations through voice, and then the process ends. If the working environment is not dangerous, continue to maintain detection and ventilation during the operation to ensure the safety of the working environment until the operation is completed.

[0044] Preferably, the parameters used in the operating method of the present invention to determine the environmental level are as follows:

[0045] When the environmental level is determined to be level one, that is, the oxygen content is less than 19.5% or greater than 23.5%, or the combustible gas is greater than 10% LEL, or the hydrogen sulfide is greater than 7ppm, or the carbon monoxide is greater than 25ppm, operators are prohibited from entering the equipment and continuous ventilation is required until the environmental level improves.

[0046] When the environmental level is level two, that is, the oxygen content is between 19.5% and 23.5%, and 5% LEL < combustible gas ≤ 10% LEL or 2ppm < hydrogen sulfide ≤ 7ppm or 7ppm < carbon monoxide ≤ 25ppm, operators must wear positive pressure isolation breathing protective equipment, full-body safety belts, and safety helmets before entering the work.

[0047] When the environmental level is level three, that is, the oxygen content is between 19.5% and 23.5%, and the combustible gas is ≤5% LEL, hydrogen sulfide is ≤2ppm, and carbon monoxide is ≤7ppm, the operators should carry emergency escape respirators, wear full-body safety belts, and wear safety helmets when entering the work area.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. The present invention uses integrated ventilation detection equipment to conduct through-type control over the entire process of detection and mechanical ventilation, enforces detection and ventilation operations, fundamentally prevents illegal operations, and reduces accident risks.

[0050] 2. The present invention guides the detection and ventilation processes through voice, display, sound and light, and the processes are locked with each other. The operation is simple and intuitive, which effectively avoids manual misoperation and improves work efficiency and accuracy.

[0051] 3. The present invention eliminates human interference factors through automatic interaction between gas detection data and the fan, ensures data reliability, accuracy of environmental judgment and rationality of ventilation time, and ensures a safe and stable working environment.

[0052] 4. In the present invention, after the personnel enter the well to work, the equipment continuously monitors the well environment and grasps the gas changes in real time, providing uninterrupted protection for the safety of the operators and enhancing the safety and reliability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the component composition of the integrated ventilation detection equipment in the present invention.

[0054] Figure 2 It is a structural schematic diagram of the axial flow explosion-proof fan and related components in the present invention.

[0055] Figure 3 This is a main viewing orientation structural parameter diagram of the gas detection system and touch display screen in the present invention.

[0056] Figure 4 This is a side structural parameter diagram of the gas detection system and touch display screen in the present invention.

[0057] Figure 5 It is a logical schematic diagram of the electric control box, the fan, the detector and the corresponding display control in the present invention.

[0058] Figure 6 The information display interface of the touch screen in the present invention Figure 1 .

[0059] Figure 7 The information display interface of the touch screen in the present invention Figure 2 .

[0060] Figure 8 The information display interface of the touch screen in the present invention Figure 3 .

[0061] Fig. 9 The information display interface of the touch screen in the present invention Figure 4 .

[0062] Fig.10 This is a working logic diagram of the ventilation detection integrated device in the present invention.

[0063] Fig.11 This is a working flow chart of the integrated ventilation detection equipment in the present invention.

[0064] Among them: 1-mobile axial flow explosion-proof fan; 2-explosion-proof switch; 3-electric control box, 301-gas detection system, 302-touch display screen. DETAILED DESCRIPTION

[0065] 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.

[0066] Embodiment 1

[0067] like Figure 1 , Figure 2 , Figure 3 The ventilation detection integrated equipment designed by the present invention is equipped with a ventilation system, a detection system, and a control system. The specific configuration contents are as follows:

[0068] (I) Ventilation system: It consists of a fan, special-shaped air duct joints, special-shaped flexible air ducts and ventilation accessories. The fan uses a 310mm axial flow explosion-proof fan with strong ventilation capacity to meet the ventilation needs of limited spaces. The supporting structure of the special-shaped flexible air duct is an elliptical keel with equal cross-section, which reduces the space occupied by the wellhead while ensuring the ventilation volume, and can ensure continuous ventilation during the construction process. The ventilation duct uses a hose, and the hose and connecting accessories can be stored in a storage box when not in use, which is convenient for carrying and storage, making the overall equipment have good mobility.

[0069] (ii) Detection system: including gas detection sensors, air pumps, gas sampling tubes, wireless transmission modules and their detection accessories. The gas detection sensors, air pumps, wireless transmission modules and their detection accessories are integrated into a detector. The gas sampling tube is fixed on the elliptical air duct, which can monitor the gas content in the confined space during the entire construction process. The detector is connected to the sampling tube, which extends into the confined space. The gas detection sensor is connected to the electric control box via wireless transmission, and the detection data is sent to the receiving module of the electric control box via wireless transmission. The receiving module then transmits the data to the main control unit in wired mode, ensuring the stability and timeliness of data transmission and meeting the equipment's requirements for gas detection data processing.

[0070] (III) Control system: including the housing of the electric control box, the circuit board and its control components. The circuit board is equipped with a main control unit, which is equipped with an electric control software developed based on the hazard classification standard for confined space operations. The output of the main control unit is connected to a voice module and a display module, which can display the received data and determine whether to control the voice module and the display module to sound and light alarm according to the built-in logic, so as to promptly inform the operator of the working environment conditions and potential dangers. The gas detection sensor, air pump and its detection components in the detection system are integrated into the housing of the electric control box, which is installed on the side wall of the fan, realizing the compactness and integrity of the equipment structure, and facilitating operation and maintenance. The control components include a touch screen for inputting and displaying real-time dynamic information. The main control unit is connected to the fan electronic control through the relay configured in the electric control box, and can automatically control the start and stop of the fan according to the gas detection data and the environmental level judgment results. Through the structural parameters such as the volume of the confined space and the number of openings input in advance, the ventilation time is automatically calculated and adjusted according to the working environment parameters, without manual intervention, effectively eliminating the interference of human factors on the ventilation operation.

[0071] Embodiment 2

[0072] The ventilation detection equipment of the present invention is developed to meet the requirements of key safety protection measures such as gas detection and ventilation before working in limited spaces such as inspection wells, underground trenches, etc. of municipal infrastructure such as water, electricity, gas, and heat. It has functions and features such as light weight and portability, integrated design of detection and ventilation, and automatic on-off control of intelligent control, to ensure the life safety of operators. The ventilation detection equipment adopts an integrated design of ventilation and detection system, and is structurally divided into two parts: a fan and a storage box. It is lightweight and portable overall. The gas detection system is integrated in the control box, which is installed on the side wall of the fan. The ventilation duct adopts a hose, and the hose and connecting accessories are stored in the storage box when not in use.

[0073] The communication control architecture adopted by the ventilation detection integrated device of the present invention is as follows:

[0074] Combination Figure 1 , Figure 2 , Figure 5 The gas detection sensor (detector) collects gas in a limited space through a sampling tube, and after detection, sends the relevant data to the receiving module of the electric control box by wireless means. The receiving module further transmits the data to the main control unit by wired mode, and the main control unit displays the data on the touch screen (such as Figure 6 , Figure 7 , Figure 8 , Fig. 9 ), and make logical judgments, control the voice module and display module to give sound and light alarms when necessary, and control the start and stop of the fan through relays.

[0075] The working mode of the integrated ventilation detection device of the present invention is as follows:

[0076] The integrated inspection and testing machine is based on a 310mm axial-flow explosion-proof fan, integrating gas detection and intelligent control functions to cope with different working scenarios in limited spaces. Figure 2 , Fig.10 , Fig.11 Before the operation, the volume and opening of the confined space are input on the touch screen through voice guidance, and the ventilation time is intelligently controlled in combination with the gas detection results in the well. After the ventilation is completed, the gas detection is carried out again. If the standard is met, the green release light will be on, otherwise, the sound and light alarm will be sounded and the ventilation will continue for a period of time, and then the detection will be carried out again until the gas meets the standard. During the operation, the monitoring mode is adopted, and the monitoring equipment continuously monitors the gas content in the confined space. Once the threshold is exceeded, the operator will be immediately warned by sound and light to leave the confined space, and forced air supply will be turned on to ensure the safety of the personnel.

[0077] The environmental grade standards for ventilation detection and determination in the present invention are as follows:

[0078] The basis for judging the environmental level is the Beijing landmark DB11 / T 852-2019 "Technical Specifications for Safety of Confined Space Operations" built into the software. The environmental level is judged in accordance with the provisions of the specification for oxygen content, combustible gas, hydrogen sulfide, carbon monoxide and other indicators. The operating process and the adoption of safety protection measures are guided according to the judgment results to ensure that the operating operations comply with safety specifications.

[0079] Table 1 Environmental level determination basis

[0080]

[0081] 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 ventilation detection integrated device, characterized in that: Including ventilation system, detection system and control system; The ventilation system includes a fan, a special-shaped air duct joint, a special-shaped flexible air duct and ventilation accessories, wherein the supporting structure of the special-shaped flexible air duct is an elliptical keel with a uniform cross-section, and the material of the special-shaped flexible air duct is a PVC flexible material; The detection system is provided with a gas detection sensor, an air pump, a gas sampling tube, a wireless transmission module and its detection accessories, the gas detection sensor, the air pump, the wireless transmission module and its detection accessories are assembled into a detector, and the gas sampling tube is attached to an oval air duct; The control system includes an electric control box housing, a circuit board and its control components, wherein the circuit board is equipped with a main control unit, the main control unit is equipped with electric control software developed based on the hazard classification standard for confined space operations, and the output of the main control unit is connected to a voice module and a display module; The gas detection sensor, air pump and its detection accessories in the detection system constitute a detector and are integrated in an electric control box housing. The electric control box housing is installed on the side wall of the fan. The control accessories include a touch screen for inputting and displaying real-time dynamic information.

2. The integrated ventilation detection device according to claim 1, characterized in that: The fan is a mobile axial flow explosion-proof fan with a diameter of 310 mm.

3. The integrated ventilation detection device according to claim 1, characterized in that: The gas detection sensor is connected to a sampling tube, the sampling tube extends into a limited space, and the gas detection sensor is connected to an electric control box via a Loar wireless transmission method.

4. The integrated ventilation detection device according to claim 1, characterized in that: The main control unit is connected to the fan electronic control via a relay configured in the electronic control box.

5. A method for operating an integrated ventilation detection device, characterized in that: A ventilation detection integrated device according to any one of claims 1 to 4, comprising the following contents: First, before the operation, input relevant information through the touch screen of the equipment as the basic data for subsequent gas detection and environmental level judgment; Second, test different test points at the top, middle and bottom of the confined space workplace. According to the test results, mechanical ventilation is started when the environment is not level 3, and the ventilation time is calculated based on the parameters; Third, after ventilation is completed, perform gas detection again: If the test results meet the safety requirements of the operation, the display module will light up the green release light, allowing the operator to enter the confined space for operation, and provide the operator with safety protection reminders through voice; If the gas concentration still exceeds the standard, the sound and light alarm will be activated, and the air will be ventilated for a period of time and tested again until the gas reaches the standard, ensuring that the air quality in the confined space meets the safety standard before the operation; Fourth, when workers enter a confined space to work, the integrated ventilation detection equipment enters the ventilation monitoring state during operation. The equipment provides two modes, continuous ventilation and intermittent ventilation, for users to choose. When it detects that the environmental concentration exceeds the standard, it automatically controls the fan to start, and prompts people to leave the confined space through voice.

6. The operating method of the integrated ventilation detection device according to claim 5, characterized in that: Includes the following: Step 1: Initial Preparation S1. Place the integrated ventilation detection equipment outside the confined space, in a suitable location where the air is clean and flows smoothly, and connect the special-shaped air duct joint, special-shaped flexible air duct and gas sampling tube; S2. After completing the equipment layout, connect the power supply and perform the "power on" operation, that is, turn on the fan and detector respectively to prepare for subsequent testing and ventilation work; S3. The equipment guides the operator to input the volume and opening number of the confined space on the touch screen through voice, and selects whether there may be toxic, harmful, flammable and explosive gas outbursts, or sudden hypoxia and related assessment results during the operation. According to the volume-related parameter results combined with the gas detection results in the well, the hazard classification of the confined space operation is determined, and the ventilation time is adjusted using the built-in program based on the classification results; Step 2: Start initial testing and evaluation S4. Perform "upper gas detection" to detect the gas in the upper area of ​​the limited space: if the upper gas detection is not completed, continue the upper gas detection until the detection is completed, and then proceed to the next step; S5. After the upper gas detection is completed, the "middle gas detection" is then carried out to detect the gas in the middle area of ​​the limited space: if the middle gas detection is not completed, continue to detect the middle gas until the detection is completed, and then enter the next link; S6. After the middle gas detection is completed, start "lower gas detection" to detect the gas in the lower area of ​​the limited space: if the lower gas detection is not completed, continue to detect until the lower gas detection is completed, and then enter the "determine the environmental level" step; Step 3: Work environment assessment and ventilation control S7. Determine the environmental level of the confined space based on the detection results of the upper, middle and lower gases: When the judgment results of the upper, middle and lower gas detection data are all "Level 3", the "voice prompt operation corresponding operation" phase will be entered. The equipment will prompt the operator to carry an emergency escape respirator, wear a full-body safety belt, wear a safety helmet and related protective equipment to enter the confined space for operation through voice; When the judgment result of any gas detection data of the upper, middle and lower parts is "non-level three", or after starting up, "whether there may be toxic and harmful, flammable and explosive gas protrusion, or sudden hypoxia assessment results during the operation" is selected, the "ventilation" link is entered, and the ventilation time is calculated by 8 times the ventilation volume according to the structural parameters input after starting up, and the ventilation operation of the limited space is started, and the air duct is placed in the lower part of the limited space for mechanical ventilation; When any of the detection data of the upper and middle gases exceeds the standard, i.e. the first-level environment, no further detection will be carried out and the "ventilation" link will be entered directly; S8. After ventilation is completed, follow the voice prompts to perform the following gas detection steps: S8.

1. "Detect upper gas" again. If not completed, continue to detect. After completion, proceed to the next step; S8.

2. Then "detect the middle gas", continue to detect if it is not completed, and proceed to the next step after completion; S8.

3. Then "detect the lower gas", if it is not completed, continue the detection, and after completion, enter the "determine the environmental level" step again; S9. Re-evaluate the environmental level based on the upper, middle and lower gas results after ventilation: S9.

1. When the judgment result of any of the upper, middle and lower gas detection data is "Level 1", return to "ventilation" and repeat the gas detection steps in the above ventilation process until the environmental level is no longer "Level 1"; S9.

2. When the judgment result of any of the upper, middle and lower gas detection data is "non-level one", the "voice prompt corresponding operation" link will be entered. The equipment will prompt the operator to take corresponding operation measures according to the current environmental level through voice: Among them, when the judgment results of the detection data of the upper, middle and lower gases are all "Level 3", the "voice prompt operation corresponding operation" link will be entered. The equipment will use voice to prompt the operator to carry an emergency escape respirator, wear a full-body safety belt, wear a safety helmet and related protective equipment to enter the confined space for operation: Among them, when the judgment result of any of the upper, middle and lower gas detection data is "Level 2", the "voice prompt corresponding operation" link will be entered. The equipment will use voice to prompt the operator to wear positive pressure isolation respiratory protective equipment, wear full body safety belts, wear safety helmets and related protective equipment to enter the confined space for operation; S10. Finally, during the operation, when the gas detection alarm continues to detect gas, the fan will be automatically turned on every 5 minutes if the intermittent ventilation is qualified according to the detection data; if the detection result is unqualified, the fan will be immediately started to implement ventilation during the operation, and the external operator will be prompted by voice: S10.

1. If the working environment is dangerous, the equipment will prompt the operator to take appropriate evacuation actions through voice, and then the process will end; S10.

2. If the working environment is not dangerous, continue to maintain detection and ventilation during the operation to ensure a safe working environment until the operation is completed.

7. The operating method of the integrated ventilation detection device according to claim 6, characterized in that: When the environmental level is judged as level 1, that is, the oxygen content is less than 19.5% or greater than 23.5%, or the combustible gas is greater than 10% LEL, or the hydrogen sulfide is greater than 7ppm, or the carbon monoxide is greater than 25ppm, the equipment is prohibited for operators to enter, and continuous ventilation is required until the environmental level improves; When the environmental level is level 2, that is, the oxygen content is between 19.5% and 23.5%, and 5% LEL < combustible gas ≤ 10% LEL or 2ppm < hydrogen sulfide ≤ 7ppm or 7ppm < carbon monoxide ≤ 25ppm, the operators shall wear positive pressure isolation breathing protective equipment, full body safety belts, and helmets before entering the operation; When the environmental level is level three, that is, the oxygen content is between 19.5% and 23.5%, and the combustible gas is ≤5% LEL, hydrogen sulfide is ≤2ppm, and carbon monoxide is ≤7ppm, the operators should carry emergency escape respirators, wear full-body safety belts, and wear safety helmets when working.

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