A fire hazard monitoring device for welding operations

Abstract

The present application relates to the field of fire warning device, especially to a kind of fire hazard monitoring equipment for welding operation.It includes monitoring box, sampling assembly and monitoring alarm assembly.The inside of monitoring box is divided into drive chamber, confluence chamber and monitoring chamber by partition combination;multiple groups of sampling assembly are located outside monitoring box, and the outlet end is connected with monitoring chamber one by one;multiple groups of monitoring alarm assembly are set in monitoring chamber one by one, gas sample is introduced when moving up, on the one hand, the introduced gas sample is compressed when moving down, the particle concentration in gas is improved, on the other hand, airflow is generated, which drives the particles in gas to flow uniformly;finally, the particle size and content in gas sample at different positions are detected by monitoring end of multiple groups of monitoring alarm assembly respectively, fire hazard is judged and alarm is sent.The present application adds compression concentration, airflow driving and comparative analysis monitoring mode, distinguishes whether the particle is generated by welding or fire hazard, and then reduces misjudgment and improves the accuracy of monitoring.

Description

Technical Field

[0001] This invention relates to the field of fire early warning equipment, and in particular to a fire hazard monitoring device for welding operations. Background Technology

[0002] Welding operations present various fire hazards, primarily involving high-temperature sparks, flammable materials, electrical equipment, and the operating environment. Below are some common fire hazards and brief explanations:

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

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

[0005] 3. Heat conduction ignition: The high temperature of welding is conducted through the metal components to the distant combustibles (such as wall insulation layers, wooden supports), and the heat accumulates in the enclosed space (such as mezzanine, ceiling), delaying ignition.

[0006] 4. Electrical equipment hazards: Aging of welding machine cables, damaged insulation, and loose joints may lead to short circuits and fires; unauthorized wiring, overloading of electrical circuits, or use of substandard power strips.

[0007] 5. Work environment risks: Welding in confined spaces (such as ship cabins or basements) may accumulate flammable gases (such as methane); there may be no fireproof barriers (such as fire blankets or baffles) or insufficient safety distance (less than 10 meters from flammable materials).

[0008] Chinese patent document CN220651392U discloses a fire safety monitoring device with alarm function, including a support plate. A safety monitoring device protection box is fixedly connected to the bottom surface of the support plate. Two circular tubes are fixedly connected to the back of the safety monitoring device protection box. A rotary motor is fixedly connected to the inner wall of each of the two circular tubes. A rotating rod is fixedly connected to the output end of each of the two rotary motors. A ring-shaped heat dissipation fan blade is fixedly connected to the outer surface of each of the two rotating rods.

[0009] The aforementioned equipment obtains information about fires by directly monitoring the temperature and smoke in the air in real time. However, since welding operations also produce smoke, and the characteristics of these particulate matter are similar to those of smoke produced during a fire, directly monitoring the smoke can lead to low accuracy and misjudgment, which in turn affects normal welding operations. Summary of the Invention

[0010] To address the problems existing in the background technology, a fire hazard monitoring device for welding operations is proposed. Through monitoring methods such as pressurization and concentration, airflow propulsion, and comparative analysis, it can distinguish between particles generated by welding and particles generated by fire hazards, thereby reducing misjudgments and improving monitoring accuracy.

[0011] This invention proposes a fire hazard monitoring device for welding operations, comprising a monitoring box, sampling components, and monitoring and alarm components. The monitoring box is placed at the welding site and is internally divided by a combination of partitions into a drive chamber, a merging chamber located below the drive chamber, and monitoring chambers located on both sides of the drive chamber and connected to the merging chamber. The drive chamber houses the drive components. The merging chamber is used to merge gas samples after monitoring. Multiple sampling components are located outside the monitoring box, with their outlets connected to the monitoring chambers. These components collect gas samples from different locations in the welding environment through moving air intake, and also circulate air through moving air intake. Multiple monitoring and alarm components are correspondingly located in the monitoring chambers and are configured to move up and down driven by the drive components. When the monitoring and alarm components move upwards, they introduce gas samples; when they move downwards, they compress the introduced gas samples, increasing the particle concentration in the gas, and generate airflow, causing the particles in the gas to flow evenly. Finally, the monitoring ends of the multiple monitoring and alarm components detect the particle size and content in the gas samples at different locations, determine the fire hazard, and issue an alarm.

[0012] Preferably, the partition assembly includes a horizontal partition and vertical partitions located on both sides of the horizontal partition, forming an H-shape; the monitoring chamber, sampling component and monitoring alarm component are each provided in two sets, located on both sides of the partition assembly respectively.

[0013] Preferably, the monitoring and alarm component includes a turntable that is driven to rotate at its origin by a drive component; a rotatable connecting rod is provided at a non-central position of the turntable; a hollow lifting plate is located on one side of the turntable and slides up and down 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, rotatably connecting to a moving platform inside it; the moving platform is slidably arranged to drive the lifting plate to rise and fall synchronously; and the monitoring end is located at the bottom of the lifting plate.

[0014] Preferably, a monitoring station is provided on the monitoring end; a rotatable mounting boss is provided at the center of the bottom of the monitoring station, and a ring of detectors is provided around the perimeter; a pusher is provided on the side wall of the mounting boss located below the detector; the detector is connected to the alarm device via signal.

[0015] Preferably, the bottom of the lifting plate is provided with a ring of inlets and outlets with valves around the monitoring platform; the moving platform is provided with retractable jet nozzles that correspond one-to-one with the inlets and outlets, and a miniature air compressor connected to the jet nozzles is also provided.

[0016] Preferably, the two sets of lifting plates rise and fall alternately; the bottom of the monitoring box is equipped with a one-way air inlet valve that connects to the monitoring chamber and is always located below the lifting plate; the bottom of the vertical partition is equipped with a one-way air outlet valve that connects to the merging chamber and is always located below the lifting plate.

[0017] Preferably, the sampling assembly includes a movable base, a telescopic rod, and a sampling hood arranged from bottom to top; the sampling hood is connected to a one-way air intake valve via a pipe.

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

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

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

[0021] Compared with existing technologies, this invention has the following beneficial technical effects: First, two sets of alternating and independent sampling components are set up to sample air from different locations in the welding work environment. This allows for targeted sample collection and monitoring while also accelerating air circulation. Next, a set of alternating and independent monitoring and alarm components are set up. The up-and-down movement of a lifting plate ensures smooth air intake and exhaust. Simultaneously, the downward movement of the lifting plate pressurizes and concentrates the gas sample. A high-pressure airflow is ejected downwards from the jet nozzle, propelling the air below and the propeller, causing the concentrated particles to float evenly, thus optimizing monitoring conditions. Then, detectors are used to detect the concentration and size of particles in the gas samples from the two monitoring rooms; fire hazards are identified and alarms are issued. Since welding fumes (larger particles) differ from actual fire smoke (smaller particles), this monitoring method of pressurization, concentration, airflow propulsion, and comparative analysis can distinguish between particles generated from welding and those generated by fire hazards, thereby reducing misjudgments and improving monitoring accuracy. Finally, the gas samples after monitoring are treated using a circulating spray system. This effectively filters out smoke particles from welding operations, purifies the air efficiently, and humidifies the air, reducing the probability of fire and further improving the safety and environmental friendliness of welding operations. Attached Figure Description

[0022] Figure 1 Structural diagram of fire hazard monitoring equipment for welding operations in Implementation 1;

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

[0024] Figure 3 A structural diagram of the partition assembly (view 1);

[0025] Figure 4 The structural diagram of the partition assembly (perspective two);

[0026] Figure 5 This is a sectional view of the lifting platform;

[0027] Figure 6 A breakdown diagram of the monitoring and alarm components;

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

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

[0030] Figure 9 Structural diagram of fire hazard monitoring equipment for welding operations in Implementation 2;

[0031] Figure 10 A partial cross-sectional view of the fire hazard monitoring equipment used in welding operations during implementation step two;

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

[0033] Attached reference numerals: 1. Monitoring box; 101. Combination chamber; 102. Drive chamber; 103. Monitoring chamber; 104. One-way air inlet valve; 2. Sampling assembly; 201. Pipeline; 202. Sampling hood; 203. Negative pressure fan; 204. Telescopic rod; 205. Movable base; 3. Horizontal partition; 4. Drive assembly; 401. Motor; 402. Gear 2; 403. Gear 1; 404. Drive shaft; 5. Monitoring and alarm assembly; 501. Lifting plate; 502. Turntable; 503. Connecting rod; 50 4. Moving platform; 505. Slider; 506. Buffer spring; 507. Inlet / outlet; 508. Jet nozzle; 509. Miniature air compressor; 510. Monitoring platform; 511. Detector; 512. Mounting boss; 513. Propeller; 6. Vertical partition; 601. One-way exhaust valve; 7. Purification assembly; 701. Purification box; 702. Filter screen; 703. Circulating spray assembly; 70301. T-shaped water pipe; 70302. Spray pipe; 70303. Circulating pump; 704. Air outlet. Detailed Implementation

[0034] Example 1: This example proposes a fire hazard monitoring device for welding operations, such as... Figures 1-2As shown, the equipment includes a monitoring box 1, sampling components 2, and monitoring and alarm components 5. The monitoring box 1 is located at the welding work site and is internally divided by a combination of partitions into a drive chamber 102, a merging chamber 101 located below the drive chamber 102, and monitoring chambers 103 located on both sides of the drive chamber 102 and connected to the merging chamber 101. The drive component 4 is installed inside the drive chamber 102. The merging chamber 101 is used to merge the monitored gas samples. Multiple sampling components 2 are located outside the monitoring box 1, with their outlets connected to the monitoring chambers 103 respectively. They collect gas samples from different locations in the welding work environment through moving air intake, and also facilitate air circulation through moving air intake. Multiple sets of monitoring and alarm components 5 are installed one-to-one in the monitoring room 103, and are configured to move up and down by drive components 4. When the monitoring and alarm components 5 move up, they introduce gas samples. When the monitoring and alarm components 5 move down, they compress the introduced gas samples to increase the concentration of particles in the gas and generate airflow to make the particles in the gas flow evenly. Finally, the monitoring terminals of the multiple sets of monitoring and alarm components 5 detect the particle size and content in the gas samples at different locations to determine fire hazards and issue alarms.

[0035] like Figures 3-4 As shown, the partition assembly includes a horizontal partition 3 and vertical partitions 6 located on both sides of the horizontal partition 3, forming an H-shape; the monitoring chamber 103, the sampling component 2, and the monitoring alarm component 5 are each provided in two sets, located on both sides of the partition assembly respectively.

[0036] One of the two monitoring rooms (103) is used for gas monitoring of welding operation accessories, while the other is used for monitoring the general environment. This comparison method can improve the sensitivity of fire hazard monitoring. It can also be used to enhance air circulation in the welding operation environment, reducing the probability of fire hazards.

[0037] like Figure 5 As shown, the monitoring and alarm component 5 includes a turntable 502 driven to rotate at its origin by a drive component 4; 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, rotatably connecting to the moving platform 504 inside; the moving platform 504 is slidably arranged, driving the lifting plate 501 to rise and fall synchronously; the monitoring end is located at the bottom of the lifting plate 501.

[0038] It should be further explained that the moving platform 504 is equipped with a slider 505 and a buffer spring 506; the slider 505 cooperates with the slide rail on the lifting plate 501 to make the horizontal movement of the moving platform 504 smoother; the buffer spring 506 is connected to the inner wall of the lifting plate 501 to buffer the movement of the moving 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 drive shaft 404 that connects the two sets of turntables 502 in a circular shape; a gear 403 is keyed to the drive shaft 404, and a gear 402 is provided on one side of the drive shaft 404; the gear 402 is driven by a motor 401 and meshes with the gear 403.

[0041] The drive assembly 4 drives two sets of turntables 502 to rotate synchronously, and the connecting rod 503 moves in a circular trajectory. The moving table 504 drives the lifting plate 501 to rise and fall synchronously. When the lifting plate 501 rises, it introduces outside air into the monitoring chamber 103. When the lifting plate 501 falls, it compresses the air below for further detection.

[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 ring of detectors 511 is provided around its outer perimeter; a pusher 513 located below the detectors 511 is provided on the side wall of the mounting boss 512; the detectors 511 are connected to the alarm equipment signal.

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

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

[0045] like Figure 7 As shown, the bottom of the lifting plate 501 is provided with a ring of inlet and outlet 507 with valves around the monitoring platform 510; the moving platform 504 is provided with a retractable jet head 508 that corresponds one-to-one with the inlet and outlet 507, and a miniature air compressor 509 connected to the jet head 508 is also provided; the pusher 513 extends to the bottom of the jet head 508 and is provided with a force-bearing inclined surface facing the jet head 508.

[0046] Before monitoring, the lifting plate 501 reaches the set low position (which can be triggered by a set position sensor). At this time, the jet head 508 moves to correspond one-to-one with the inlet and outlet 507. The jet head 508 extends out of the opened inlet and outlet 507 and sprays high-pressure airflow downwards. The high-pressure airflow directly pushes the air below and also pushes the propeller 513, both of which can accelerate the airflow and make particles of all sizes float evenly, thus facilitating detection.

[0047] It should be further explained that the two sets of lifting plates 501 rise and fall alternately; through the alternating operation of the two sets of lifting plates 501, the two sets of sampling components 2 also operate alternately. This intermittent operation mode is more energy-efficient and environmentally friendly; the bottom of the monitoring box 1 is equipped with a one-way air inlet valve 104 that connects to the monitoring chamber 103 and is always located below the lifting plate 501; the bottom of the vertical partition 6 is equipped with a one-way air outlet valve 601 that connects to the merging chamber 101 and is always located below the lifting plate 501; when the lifting plate 501 moves upward, external air enters the monitoring chamber 103 through the one-way air inlet valve 104. When the lifting plate 501 moves downward, the compressed air is tested to the set value, and after the test, the one-way air outlet valve 601 opens, and the air is discharged into the merging 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 a one-way air intake valve 104 through a pipe 201.

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

[0050] It should be further noted that the movable base 205 is equipped with wheels.

[0051] It should be further noted that the telescopic rod 204 is set to be electrically controlled for telescopic extension.

[0052] The sampling point is moved using the movable base 205, and the sampling height is adjusted by extending and retracting the telescopic rod 204. A negative pressure fan 203 can then be used to extract air for sampling. This can be used for both fire hazard monitoring and air circulation.

[0053] Example 2, based on Example 1, this example adds a purification component 7 to the outside of the monitoring box 1, with the specific structure as follows: Figures 9-11 As shown, the purification assembly 7 includes a purification chamber 701; the bottom of the purification chamber 701 is connected to a confluence chamber 101, and both are filled with purification liquid; the top of the purification chamber 701 is provided with an outlet 704; the liquid level of the purification liquid is higher than that of the one-way outlet valve 601; the outlet 704 is higher than the liquid level of the purification liquid. After monitoring, the gas enters the confluence chamber 101 and is purified by the purification liquid, and then discharged from the outlet 704.

[0054] It should be further explained that the purification box 701 is equipped with a filter screen 702 that is immersed in the purification liquid and located above the air outlet of the confluence chamber 101; a circulating spray assembly 703 is provided between the filter screen 702 and the air outlet 704; 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 screen 702 and are equipped with a circulating pump 70303, and a spray pipe 70302 is installed between the horizontal sections of the two sets of T-shaped water pipes 70301.

[0056] It should be further explained that the circulating spray assembly 703 is set with 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 again to purify the overflowing gas. Through this purification process, on the one hand, it effectively filters out smoke particles from welding operations, efficiently purifying the air; on the other hand, it humidifies the air, reducing the probability of fire.

[0058] Example 3: Based on the fire hazard monitoring equipment for welding operations described 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. Select welding operation accessories on one side and normal environment on the other. Adjust the sampling height by extending and retracting the telescopic rod 204.

[0060] S2. During welding operations, two sets of negative pressure fans 203 alternately draw 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 drive the lifting plates 501 to rise and fall alternately in the same direction; the rising side of the lifting plate 501 introduces external air into the monitoring room 103; the falling side of the lifting plate 501 compresses the air below.

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

[0062] S4 and detector 511 respectively detect the concentration and size of particles in the gas samples in the two monitoring chambers 103; identify fire hazards and issue alarms, and issue alarms to staff when there are fire hazards;

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

[0064] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, 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: The monitoring box (1) is placed at the welding work site. The interior is divided 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). The drive chamber (102) is equipped with a drive assembly (4). The merging chamber (101) is used to merge the gas samples after monitoring. Sampling component (2), multiple sampling components (2) are located outside the monitoring box (1), and the gas outlets are connected to the monitoring chamber (103) one by one. On the one hand, gas samples from different locations in the welding operation environment are collected by moving the air intake, and on the other hand, air circulation is carried out by moving the air intake. And monitoring and alarm components (5), multiple sets of monitoring and alarm components (5) are set one by one in the monitoring room (103), and are set to move up and down by driving components (4); when the monitoring and alarm components (5) move up, they introduce gas samples; when the monitoring and alarm components (5) move down, they compress the introduced gas samples on the one hand, increase the concentration of particles in the gas, and generate airflow on the other hand, so that the particles in the gas flow evenly; finally, the monitoring ends of multiple sets of monitoring and alarm components (5) are used to detect the particle size and content in gas samples at different locations, judge the fire hazards and issue an alarm. The partition assembly includes a horizontal partition (3) and vertical partitions (6) located on both sides of the horizontal partition (3), which together form an H-shape; the monitoring chamber (103), the sampling assembly (2) and the monitoring alarm assembly (5) are each provided in two sets, located on both sides of the partition assembly respectively; The monitoring and alarm component (5) includes a turntable (502) driven to rotate at its origin by a drive component (4); 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 up and down 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 rotatably connects to the moving platform (504) inside it; the moving platform (504) is slidably set and drives the lifting plate (501) to rise and fall synchronously; the monitoring end is set at the bottom of the lifting plate (501); A monitoring station (510) is provided on the monitoring end; a rotatable mounting boss (512) is provided at the bottom center of the monitoring station (510), and a detector (511) is provided around the outer perimeter; a pusher (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. The bottom of the lifting plate (501) is surrounded by a ring of inlet and outlet (507) with valves around the monitoring platform (510); the moving platform (504) is provided with a retractable jet nozzle (508) that corresponds one-to-one with the inlet and outlet (507), and is also provided with a miniature air compressor (509) connected to the jet nozzle (508). Two sets of lifting plates (501) are raised and lowered alternately; the bottom of the monitoring box (1) is provided with a one-way air inlet valve (104) that connects 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 connects to the merging chamber (101) and is always located below the lifting plate (501).

2. The fire hazard monitoring equipment for welding operations according to claim 1, characterized in that, The sampling assembly (2) includes a movable base (205), a telescopic rod (204) and a sampling cover (202) arranged sequentially from bottom to top; the sampling cover (202) is connected to a one-way air intake valve (104) through a pipe (201).

3. The fire hazard monitoring equipment for welding operations according to claim 1, characterized in that, The monitoring box (1) is equipped with a purification component (7) on the outside. The purification component (7) includes a purification box (701). The bottom of the purification box (701) is provided with a connecting chamber (101), and both are filled with purification liquid. The top of the purification box (701) is provided with an air outlet (704). The level of the purification liquid is higher than that of the one-way vent valve (601). The air outlet (704) is higher than the liquid level of the purification liquid.

4. The fire hazard monitoring equipment for welding operations according to claim 3, characterized in that, The purification chamber (701) is equipped with a filter screen (702) that is immersed in the purification liquid and located above the air outlet of the confluence chamber (101); a circulating spray assembly (703) is provided between the filter screen (702) and the air outlet (704).

5. The fire hazard monitoring equipment for welding operations according to claim 4, characterized in 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 screen (702) and are equipped with a circulating pump (70303); a spray pipe (70302) is installed between the horizontal sections of the two sets of T-shaped water pipes (70301).

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