Fire hazard monitoring equipment for welder operation

Abstract

The invention relates to the field of fire early warning equipment, in particular to fire hazard monitoring equipment for welder operation. The device comprises a monitoring box, a sampling assembly and a monitoring alarm assembly. The interior of the monitoring box is divided into a driving chamber, a convergence chamber and a monitoring chamber by partition plate combinations; the sampling assemblies are located outside the monitoring box, and the air outlet ends communicate with the monitoring chambers in a one-to-one correspondence mode. The multiple groups of monitoring alarm assemblies are arranged in the monitoring chamber in a one-to-one correspondence manner, introduce a gas sample when moving upwards, compress the introduced gas sample and improve the particle concentration in the gas when moving downwards, and generate gas flow to drive the particles in the gas to flow uniformly; and finally, detecting the sizes and contents of particles in the gas samples at different positions through the monitoring ends of a plurality of groups of monitoring and alarming assemblies, judging fire hazards and giving an alarm. According to the invention, through the monitoring modes of pressure concentration, airflow pushing and comparative analysis, whether the particles are particles generated by welding or particles generated by fire hazards is distinguished, so that misjudgment is reduced, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of fire warning equipment, and in particular to fire hazard monitoring equipment for welding operations. Background Art

[0002] There are many fire hazards in welding operations, mainly involving high temperature sparks, flammable materials, electrical equipment, and operating environment. The following are common fire hazards and brief descriptions:

[0003] 1. Sparks and slag splashing: High-temperature sparks, molten metal or slag (temperatures can reach thousands of degrees Celsius) generated during welding, cutting or grinding can splash onto surrounding combustible materials (such as oil, wood, paper, plastic, etc.).

[0004] 2. Contact with flammable and explosive substances: Flammable liquids (gasoline, paint, solvents), gases (acetylene, hydrogen, liquefied gas) or dust (flour, aluminum powder, coal powder) are stored in the working area, which may cause explosion or combustion when exposed to sparks.

[0005] 3. Ignition due to heat conduction: The high temperature of welding is conducted to the remote combustible materials (such as wall insulation layer, wooden support) through the metal components. The heat accumulates in the closed space (such as mezzanine, ceiling), delaying ignition.

[0006] 4. Hidden dangers of electrical equipment: Aging welding machine cables, damaged insulation, and loose joints may cause short circuits and fires; privately pulling and connecting power cords, overloading electricity, or using unqualified socket strips.

[0007] 5. Risks in the working environment: Welding in confined spaces (such as cabins and basements) may accumulate combustible gases (such as methane); no fire isolation (such as fire blankets and baffles) is set up, or the safety distance is insufficient (less than 10 meters from combustible materials).

[0008] The Chinese patent document with authorization announcement number CN220651392U discloses a fire safety monitoring device with an alarm function, including a support plate, the bottom surface of which is fixedly connected to a safety monitoring device protection box, the back of which is fixedly connected to two circular tubes, the inner walls of the two circular tubes are fixedly connected to a rotating motor, the output ends of the two rotating motors are fixedly connected to a rotating rod, and the outer surfaces of the two rotating rods are fixedly connected to a ring-arranged heat dissipation fan blade.

[0009] The above-mentioned equipment obtains fire conditions by directly monitoring the temperature and smoke in the air in real time. However, since smoke is also generated during welding operations, the characteristics of the particulate matter are similar to those of smoke generated during fires. Therefore, direct smoke monitoring will result in low accuracy and prone to misjudgment, which will affect normal welding operations. Summary of the Invention

[0010] In response to the problems existing in the background technology, a fire hazard monitoring device for welding operations is proposed. Through the monitoring methods of pressurized concentration, airflow propulsion and comparative analysis, it can distinguish whether the particles are generated by welding or particles generated by fire hazards, thereby reducing misjudgment and improving the accuracy of monitoring.

[0011] The present invention provides a fire hazard monitoring device for welding operations, comprising a monitoring box, a sampling assembly, and a monitoring alarm assembly. The monitoring box is arranged at the welding operation site, and is internally divided by a partition assembly into a drive chamber, a confluence chamber located below the drive chamber, and monitoring chambers located on both sides of the drive chamber and connected to the confluence chamber; a drive assembly is arranged in the drive chamber; the confluence chamber is used to converge gas samples after monitoring; multiple sets of sampling assemblies are located outside the monitoring box, and the gas outlet ends are connected to the monitoring chambers in a one-to-one correspondence. On the one hand, gas samples at different locations in the welding operation environment are collected by moving suction, and on the other hand, air circulation is carried out by moving suction; multiple sets of monitoring alarm assemblies are arranged in a one-to-one correspondence in the monitoring chambers and are configured to move up and down by the driving assembly; when the monitoring alarm assembly moves up, the gas sample is introduced, and when the monitoring alarm assembly moves down, the introduced gas sample is compressed to increase the particle concentration in the gas, and on the other hand, an air flow is generated to drive the particles in the gas to flow evenly; finally, the particle size and content in the gas samples at different locations are detected by the monitoring ends of the multiple sets of monitoring alarm assemblies, fire hazards are determined, and an alarm is issued.

[0012] Preferably, the partition assembly includes a transverse partition and vertical partitions located on both sides of the transverse partition, and the three form an H shape; the monitoring room, sampling assembly and monitoring alarm assembly are each provided in two groups, respectively located on both sides of the partition assembly.

[0013] Preferably, the monitoring and alarm component includes a turntable driven to rotate about an origin by a driving component; a rotatable connecting rod is provided at a non-center position of the turntable; a hollow lifting plate is located on one side of the turntable and slides and rises and falls along the inner wall of the monitoring chamber; one side of the connecting rod moves in a circular trajectory as the turntable rotates, and the other side extends into the open side of the lifting plate and rotates to connect to the moving platform inside it; the moving platform is slidably arranged to drive the lifting plate to rise and fall synchronously; the monitoring end is arranged at the bottom of the lifting plate.

[0014] Preferably, a monitoring platform is provided on the monitoring end; a rotatable mounting boss is provided at the bottom center of the monitoring platform, and a circle of detectors is provided on the periphery; a push paddle located below the detector is provided on the side wall of the mounting boss; and the detector is connected to the alarm device signal.

[0015] Preferably, a circle of inlets and outlets with valves is provided around the monitoring platform at the bottom of the lifting plate; a retractable spray head corresponding to the inlets and outlets is provided on the movable platform, and a micro air compressor connected to the spray head is also provided.

[0016] Preferably, the two sets of lifting plates are lifted and lowered alternately; a one-way air inlet valve connected to the monitoring chamber and always located below the lifting plate is provided at the bottom of the monitoring box; a one-way air outlet valve connected to the merging chamber and always located below the lifting plate is provided at the bottom of the vertical partition.

[0017] Preferably, the sampling assembly includes a movable base, a telescopic rod and a sampling cover arranged from bottom to top; the sampling cover is connected to the one-way air inlet valve through a pipeline.

[0018] Preferably, a purification component is provided on the outside of the monitoring box, and the purification component includes a purification box; a connecting merging chamber is provided at the bottom of the purification box, and both are filled with purification liquid, and an air outlet is provided at the top of the purification box; the liquid level of the purification liquid is higher than the one-way air outlet valve; the air outlet is higher than the liquid level of the purification liquid.

[0019] Preferably, a filter screen immersed in the purification liquid and located above the air outlet of the confluence chamber is provided in the purification box; a circulating spray component is provided between the filter screen and the air outlet.

[0020] Preferably, the circulating spray assembly includes two sets of T-shaped water pipes arranged in parallel; the vertical sections of the two sets of T-shaped water pipes face the filter screen, and a circulating pump is provided, and a spray pipe is provided between the horizontal sections of the two sets of T-shaped water pipes.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects: first, two groups of sampling components that work alternately and independently of each other are set to extract gas samples from different locations in the welding work environment. On the one hand, it can collect monitoring samples in a targeted manner, and on the other hand, it can speed up the air circulation. Then, a group of monitoring and alarm components that work alternately and independently of each other are set. By moving the lifting plate up and down, smooth air intake and exhaust are achieved. At the same time, the downward movement of the lifting plate is used to pressurize and concentrate the gas sample. The nozzle is used to spray high-pressure air downward to push the air below and the propeller, so that the concentrated particles float evenly to optimize the monitoring conditions. The detector is then used to detect the concentration and size of the particles in the gas samples in the two groups of monitoring rooms respectively; the fire hazard is judged and an alarm is issued. Since there is a difference between welding smoke (larger particles) and real fire smoke (smaller particles), this monitoring method of pressurized concentration, airflow propulsion and comparative analysis can distinguish whether the particles are generated by welding or particles generated by fire hazards, thereby reducing misjudgment and improving the accuracy of monitoring. Finally, the gas samples after monitoring are processed using a circulating spray assembly. On the one hand, it effectively filters out smoke particles during welding operations and efficiently purifies the air. On the other hand, it humidifies the air, reduces the probability of fire, and further improves the safety and environmental protection of welding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structural diagram of the fire hazard monitoring equipment used in welding operations in the implementation process;

[0023] Figure 2A cross-sectional view of a fire hazard monitoring device for welding operations during implementation.

[0024] Figure 3 This is a structural diagram of the partition assembly (viewpoint one);

[0025] Figure 4 This is a structural diagram of the partition assembly (viewpoint 2);

[0026] Figure 5 This is a cross-sectional view of the lifting plate;

[0027] Figure 6 This is a breakdown diagram of the monitoring alarm components;

[0028] Figure 7 for Figure 4 Enlarged view of point A in the middle;

[0029] Figure 8 is a structural diagram of the sampling component;

[0030] Figure 9 The structural diagram of the fire hazard monitoring equipment for welding operation in implementation 2;

[0031] Figure 10 A partial cross-sectional view of the fire hazard monitoring equipment for welding operations in implementation 2;

[0032] Figure 11 This is the structural diagram of the circulating spray component.

[0033] Figure 1: 1. Monitoring box; 101. Converging chamber; 102. Driving chamber; 103. Monitoring chamber; 104. One-way air inlet valve; 2. Sampling assembly; 201. Pipeline; 202. Sampling cover; 203. Negative pressure fan; 204. Telescopic rod; 205. Mobile base; 3. Transverse partition; 4. Driving assembly; 401. Motor; 402. Gear 2; 403. Gear 1; 404. Driving shaft; 5. Monitoring alarm assembly; 501. Lifting plate; 502. Turntable; 503. Connecting rod; 50 4. Moving table; 505. Slider; 506. Buffer spring; 507. Inlet and outlet; 508. Nozzle; 509. Miniature air compressor; 510. Monitoring station; 511. Detector; 512. Mounting boss; 513. Push paddle; 6. Vertical partition; 601. One-way air outlet valve; 7. Purification component; 701. Purification box; 702. Filter; 703. Circulating spray component; 70301. T-shaped water pipe; 70302. Spray pipe; 70303. Circulating pump; 704. Air outlet. DETAILED DESCRIPTION

[0034] Example 1: This example proposes a fire hazard monitoring device for welding operations, such as Figure 1-Figure 2As shown, the equipment includes a monitoring box 1, a sampling assembly 2, and a monitoring and alarm assembly 5. The monitoring box 1 is located at the welding site. Its interior is divided by partitions into a drive chamber 102, a confluence chamber 101 located below the drive chamber 102, and monitoring chambers 103 located on either side of the drive chamber 102 and connected to the confluence chamber 101. The drive chamber 102 houses the drive assembly 4. The confluence chamber 101 is used to collect monitored gas samples. Multiple sets of sampling assemblies 2 are located outside the monitoring box 1, with their gas outlets connected to the monitoring chambers 103 in a one-to-one correspondence. This allows for the collection of gas samples from different locations within the welding environment through mobile suction, while also ensuring air circulation. Multiple groups of monitoring alarm components 5 are arranged in a one-to-one correspondence in the monitoring room 103, and are arranged to move up and down by being driven by the driving component 4; when the monitoring alarm component 5 moves up, a gas sample is introduced, and when the monitoring alarm component 5 moves down, on the one hand, the introduced gas sample is compressed to increase the particle concentration in the gas, and on the other hand, an airflow is generated to drive the particles in the gas to flow evenly; finally, the monitoring ends of the multiple groups of monitoring alarm components 5 are used to respectively detect the particle size and content in the gas samples at different positions, judge the fire hazard and issue an alarm.

[0035] like Figure 3-Figure 4 As shown, the partition assembly includes a transverse partition 3 and vertical partitions 6 located on both sides of the transverse partition 3, and the three form an H shape; the monitoring room 103, the sampling component 2 and the monitoring alarm component 5 are each provided with two groups, respectively located on both sides of the partition assembly.

[0036] One of the two monitoring rooms 103 is used for gas monitoring near the welding operation, while the other is used for general environmental monitoring. This can improve the sensitivity of fire hazard monitoring through comparison. It can also be used to enhance the air circulation in the welding operation environment and reduce the probability of fire hazards.

[0037] like Figure 5 As shown, the monitoring alarm component 5 includes a turntable 502 driven by the driving component 4 to rotate the origin; a rotatable connecting rod 503 is set at a non-center position of the turntable 502; a hollow lifting plate 501 is located on one side of the turntable 502, and slides and rises along the inner wall of the monitoring chamber 103; one side of the connecting rod 503 moves in a circular trajectory as the turntable 502 rotates, and the other side extends into the open side of the lifting plate 501 and rotates to connect the moving platform 504 inside it; the moving platform 504 is set to slide, driving the lifting plate 501 to rise and fall synchronously; the monitoring end is set at the bottom of the lifting plate 501.

[0038] It should be further explained that a slider 505 and a buffer spring 506 are provided on the movable platform 504; the slider 505 cooperates with the slide rail on the lifting plate 501 to make the horizontal movement of the movable platform 504 smoother; the buffer spring 506 is connected to the inner wall of the lifting plate 501 to buffer the movement of the movable platform 504.

[0039] It should be further explained that the turntable 502 is embedded in the vertical partition 6 .

[0040] It should be further explained that the drive assembly 4 includes a circular drive shaft 404 connecting the two groups of turntables 502; the drive shaft 404 is keyed to gear one 403, and a gear two 402 is set on one side of the drive shaft 404; the gear two 402 is driven by the motor 401 and meshed with the gear one 403.

[0041] Drive assembly 4 drives the two sets of turntables 502 to rotate synchronously, causing connecting rod 503 to move in a circular trajectory. Moving platform 504 drives lift plate 501 to rise and fall synchronously. As lift plate 501 rises, it draws outside air into monitoring chamber 103. As lift plate 501 descends, it compresses the air below, allowing it to be further tested.

[0042] like Figure 6 As shown, a monitoring platform 510 is provided on the monitoring end; a rotatable mounting boss 512 is provided at the bottom center of the monitoring platform 510, and a circle of detectors 511 are provided on the periphery; a pushing paddle 513 located below the detector 511 is provided on the side wall of the mounting boss 512; the detector 511 is connected to the alarm device signal.

[0043] When the lifting plate 501 moves downward, the propeller 513 rotates under the push of air pressure, accelerating air circulation. In conjunction with air compression, the detector 511 detects particles in the air below.

[0044] It should be further explained that detector 511 uses a combination of a laser diffractometer and a beta-ray analyzer to detect the concentration and size of particles in the gas sample. Because welding fume (larger particles) differs from actual fire smoke (smaller particles), determining the concentration and size of particles in the gas sample can avoid misidentification of welding fume, thereby improving monitoring accuracy.

[0045] like Figure 7 As shown, a circle of inlets and outlets 507 with valves are set around the monitoring platform 510 at the bottom of the lifting plate 501; a retractable nozzle 508 corresponding to the inlet and outlet 507 is set on the moving platform 504, and a miniature air compressor 509 connected to the nozzle 508 is also provided; the propulsion paddle 513 is extended to the bottom of the nozzle 508, and a force-bearing inclined surface is set toward the nozzle 508.

[0046] Before monitoring begins, the lift plate 501 reaches its set low position (triggered by a sensor). At this point, the nozzles 508 move into alignment with the inlet and outlet 507. The nozzles 508 extend through the open inlet and outlet 507, spraying a high-pressure airflow downward. This high-pressure airflow not only directly pushes the air below but also propels the propellers 513, accelerating air circulation and ensuring a uniform float of all sizes, facilitating detection.

[0047] It should be further explained that the two sets of lifting plates 501 are raised and lowered alternately; through the alternating operation of the two sets of lifting plates 501, the two sets of sampling components 2 also work alternately. The intermittent working mode is more energy-saving and environmentally friendly; the bottom of the monitoring box 1 is provided with a one-way air inlet valve 104 that is connected to the monitoring chamber 103 and is always located below the lifting plate 501; the bottom of the vertical partition 6 is provided with a one-way air outlet valve 601 that is connected to the confluence chamber 101 and is always located below the lifting plate 501; when the lifting plate 501 moves up, the outside air enters the monitoring chamber 103 through the one-way air inlet valve 104. When the lifting plate 501 moves down, the compressed air is tested to the set value. After the test, the one-way air outlet valve 601 opens and the air is discharged into the confluence chamber 101.

[0048] like Figure 8 As shown, the sampling assembly 2 includes a movable base 205, a telescopic rod 204 and a sampling cover 202 arranged from bottom to top; the sampling cover 202 is connected to the one-way air inlet valve 104 through a pipe 201.

[0049] It should be further explained that a negative pressure fan 203 and a slag blocking net are provided in the sampling hood 202 .

[0050] It should be further explained that wheels are provided on the mobile base 205 .

[0051] It should be further explained that the telescopic rod 204 is configured to be electrically telescopic.

[0052] By moving the base 205 to the sampling point and adjusting the sampling height by telescopic rod 204, the negative pressure fan 203 can be used to extract air for sampling. On the one hand, it can be used for fire hazard monitoring, and on the other hand, it can be used for air circulation.

[0053] Example 2: Based on Example 1, this example sets a purification component 7 outside the monitoring box 1. The specific structure is as follows: Figures 9-11 As shown, the purification assembly 7 includes a purification box 701. The bottom of the purification box 701 is connected to the merging chamber 101, and both chambers are filled with purification liquid. A gas outlet 704 is located at the top of the purification box 701. The level of the purification liquid is higher than the one-way gas outlet valve 601. The gas outlet 704 is higher than the level of the purification liquid. After monitoring, the gas enters the merging chamber 101, is passed into the purification liquid, and is discharged from the gas outlet 704 after purification.

[0054] It should be further explained that a filter 702 immersed in the purification liquid and located above the air outlet of the confluence chamber 101 is provided in the purification box 701; a circulating spray component 703 is provided between the filter 702 and the air outlet 704; and the air is further purified by spraying.

[0055] It should be further explained that the circulating spray assembly 703 includes two sets of parallel T-shaped water pipes 70301; the vertical sections of the two sets of T-shaped water pipes 70301 face the filter 702, and a circulating pump 70303 is set, and a spray pipe 70302 is set between the horizontal sections of the two sets of T-shaped water pipes 70301.

[0056] It should be further explained that the circulating spraying components 703 are provided in multiple groups, and the spraying effect is increased by staggered spraying.

[0057] Filter 702 intercepts impurities in the exhaust gas. Circulation pump 70303 transfers the filtered purified liquid to T-shaped water pipe 70301, where it is sprayed down to further purify the escaping gas. This purification process not only effectively removes welding smoke particles and efficiently purifies the air, but also humidifies the air, reducing the risk of fire.

[0058] Example 3: Based on the fire hazard monitoring device for welding operations in Example 2, this example proposes a method for monitoring fire hazards during welding operations. The steps are as follows:

[0059] S1. Move the mobile base 205 to the sampling point. One of the bases can be selected as a welding accessory, and the other can be selected as a normal environment. The sampling height can be adjusted by telescopic rod 204.

[0060] S2. During welding, two sets of negative pressure fans 203 alternately extract air for sampling; at the same time, two sets of turntables 502 rotate synchronously, and the connecting rod 503 moves in a circular trajectory; two sets of moving platforms 504 respectively drive the lifting plates 501 to rise and fall simultaneously and in alternating directions; the rising side of the lifting plates 501 introduces external air into the monitoring chamber 103; the descending side of the lifting plates 501 compresses the air below;

[0061] S3. When the lifting plate 501 moves downward and reaches the set low position, the air is compressed to achieve the purpose of concentration. At this time, the nozzle 508 moves to correspond to the inlet and outlet 507 one by one. The nozzle 508 extends out of the opened inlet and outlet 507 and sprays high-pressure air downward. The high-pressure airflow directly pushes the air below and pushes the propeller 513 on the other hand, accelerating the circulation of air and making the concentrated particles float evenly.

[0062] S4, the detector 511 detects the concentration and size of particles in the gas samples in the two groups of monitoring chambers 103 respectively; determines the fire hazard and issues an alarm, and alerts the staff if a fire hazard exists;

[0063] S5. After the inspection is completed, the one-way air outlet valve 601 is opened, and the air is discharged into the confluence chamber 101, and the purified liquid is first introduced; the circulating pump 70303 transfers the filtered purified liquid to the T-shaped water pipe 70301, and then sprays it down to purify the overflowed gas again; the purified and humidified gas is discharged.

[0064] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A fire hazard monitoring device for welding operations, characterized in that: include: A monitoring box (1) is arranged at a welding operation site, and is internally divided by a partition assembly into a drive chamber (102), a merging chamber (101) located below the drive chamber (102), and a monitoring chamber (103) located on both sides of the drive chamber (102) and connected to the merging chamber (101); a drive assembly (4) is arranged in the drive chamber (102); and the merging chamber (101) is used to merge gas samples after monitoring; Sampling components (2), multiple groups of sampling components (2) are located outside the monitoring box (1), and the gas outlet ends are connected to the monitoring chamber (103) in a one-to-one correspondence. On the one hand, gas samples at different positions in the welding working environment are collected by moving the suction, and on the other hand, air circulation is carried out by moving the suction; And a monitoring alarm component (5), wherein multiple groups of monitoring alarm components (5) are arranged in a one-to-one correspondence in the monitoring room (103) and are arranged to move up and down by being driven by a driving component (4); when the monitoring alarm component (5) moves up, a gas sample is introduced; when the monitoring alarm component (5) moves down, on the one hand, the introduced gas sample is compressed to increase the concentration of particles in the gas, and on the other hand, an air flow is generated to drive the particles in the gas to flow evenly; finally, the particle size and content in the gas samples at different positions are respectively detected by the monitoring ends of the multiple groups of monitoring alarm components (5), and a fire hazard is determined and an alarm is issued.

2. The fire hazard monitoring device for welding operations according to claim 1, characterized in that: The partition assembly comprises a transverse partition (3) and vertical partitions (6) located on both sides of the transverse partition (3), and the three form an H shape; The monitoring chamber (103), the sampling assembly (2) and the monitoring alarm assembly (5) are each provided in two groups, and are respectively located on both sides of the partition assembly.

3. The fire hazard monitoring device for welding operations according to claim 2, characterized in that: The monitoring alarm component (5) includes a turntable (502) driven by a driving component (4) to rotate at an origin; a rotatable connecting rod (503) is provided at a non-center position of the turntable (502); a hollow lifting plate (501) is located on one side of the turntable (502) and slides and rises along the inner wall of the monitoring chamber (103); one side of the connecting rod (503) moves in a circular trajectory as the turntable (502) rotates, and the other side extends into the open side of the lifting plate (501) and is rotatably connected to the moving platform (504) inside the lifting plate (501); the moving platform (504) is slidably provided to drive the lifting plate (501) to rise and fall synchronously; The monitoring end is arranged at the bottom of the lifting plate (501).

4. The fire hazard monitoring device for welding operations according to claim 3, characterized in that: A monitoring platform (510) is provided on the monitoring end; a rotatable mounting boss (512) is provided at the bottom center of the monitoring platform (510), and a circle of detectors (511) are provided on the periphery; a propulsion paddle (513) is provided on the side wall of the mounting boss (512) and is located below the detector (511); The detector (511) is connected to the alarm device signal.

5. The fire hazard monitoring device for welding operations according to claim 4, characterized in that: The bottom of the lifting plate (501) is provided with a circle of inlets and outlets (507) with valves around the monitoring platform (510); The movable platform (504) is provided with a retractable spray head (508) which corresponds to the inlet and outlet (507) one by one, and is also provided with a micro air compressor (509) which is in communication with the spray head (508).

6. The fire hazard monitoring device for welding operations according to claim 5, characterized in that: Two sets of lifting plates (501) are alternately lifted and lowered; The bottom of the monitoring box (1) is provided with a one-way air inlet valve (104) which is connected to the monitoring chamber (103) and is always located below the lifting plate (501); the bottom of the vertical partition (6) is provided with a one-way air outlet valve (601) which is connected to the merging chamber (101) and is always located below the lifting plate (501).

7. The fire hazard monitoring device for welding operations according to claim 6, characterized in that: The sampling assembly (2) comprises a movable base (205), a telescopic rod (204) and a sampling cover (202) arranged from bottom to top; the sampling cover (202) is connected to a one-way air inlet valve (104) via a pipeline (201).

8. The fire hazard monitoring device for welding operations according to claim 6, characterized in that: A purification assembly (7) is provided outside the monitoring box (1), and the purification assembly (7) includes a purification box (701); a communicating merging chamber (101) is provided at the bottom of the purification box (701), and purification liquid is contained in both chambers; an air outlet (704) is provided at the top of the purification box (701); The liquid level of the purified liquid is higher than the one-way air outlet valve (601); The gas outlet (704) is higher than the liquid level of the purification liquid.

9. The fire hazard monitoring device for welding operations according to claim 8, characterized in that: A filter screen (702) immersed in the purification liquid and located above the air outlet of the confluence chamber (101) is provided in the purification box (701); a circulating spray assembly (703) is provided between the filter screen (702) and the air outlet (704).

10. The fire hazard monitoring device for welding operations according to claim 9, characterized in that: The circulating spray assembly (703) includes two sets of T-shaped water pipes (70301) arranged in parallel; the vertical sections of the two sets of T-shaped water pipes (70301) face the filter (702) and are provided with a circulating pump (70303); and a spray pipe (70302) is provided between the horizontal sections of the two sets of T-shaped water pipes (70301).

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