Smoke evacuation device and method for welding a crash test vehicle

Abstract

The application provides a kind of for collision test car welding smoke exhaust device and smoke exhaust method, it is related to welding smoke exhaust technical field, smoke exhaust device includes: main pipeline, main pipeline forms the passage for welding dust exhaust;Fan, fan is arranged on main pipeline;First branch pipeline, first branch pipeline is connected with main pipeline, and first branch pipeline is provided with first valve for controlling its on-off;Second branch pipeline, second branch pipeline is connected with main pipeline, and first branch pipeline is connected with second branch pipeline in parallel, and second branch pipeline is provided with second valve for controlling its on-off;Fixed smoke outlet, fixed smoke outlet is fixedly arranged at the top inside welding workshop;Mobile smoke outlet, mobile smoke outlet is connected with the end of second branch pipeline away from main pipeline by flexible pipeline.The smoke exhaust device and smoke exhaust method provided by the application, fixed smoke outlet and mobile smoke outlet cooperate with each other to realize efficient smoke exhaust, reduce the health impact of welding dust on welders.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding fume exhaust, in particular to a fume exhaust device and a fume exhaust method for welding of a crash test vehicle. BACKGROUND

[0002] In order to save the vehicle resource cost of the crash test, the same vehicle needs to be subjected to multiple crash tests during the development stage of the vehicle type, and the crash test vehicle needs to be welded before each test to ensure that the state of the crash test vehicle meets the requirements.

[0003] When the crash test vehicle is welded, a large amount of smoke dust is generated. At present, a fixed fume hood is usually arranged on the top of the inside of the welding workshop to exhaust the smoke dust generated by welding. However, due to the space structure of the welding workshop and the crash test vehicle, the fixed fume hood is usually far away from the welding position, the fume exhaust efficiency is low, and the health of the welders is greatly affected. SUMMARY

[0004] In order to at least partially solve the above problems, according to a first aspect of the present application, an embodiment of the present application provides a fume exhaust device for welding of a crash test vehicle. The welding of the crash test vehicle is carried out in a welding workshop. The fume exhaust device comprises: a main pipeline, the main pipeline forms a channel for discharging welding smoke dust; a fan, the fan is arranged on the main pipeline, and the fan is used to provide negative pressure required for fume exhaust; a first branch pipeline, the first branch pipeline is connected with the main pipeline, and the first branch pipeline is provided with a first valve for controlling the opening and closing thereof; a second branch pipeline, the second branch pipeline is connected with the main pipeline, and the first branch pipeline and the second branch pipeline are connected in parallel, and the second branch pipeline is provided with a second valve for controlling the opening and closing thereof; a fixed fume exhaust port, the fixed fume exhaust port is arranged at one end of the first branch pipeline away from the main pipeline, and the fixed fume exhaust port is fixedly arranged on the top of the inside of the welding workshop; a mobile fume exhaust port, the mobile fume exhaust port is connected with one end of the second branch pipeline away from the main pipeline through a flexible pipeline, and the mobile fume exhaust port is adjustably arranged in the welding workshop, and the position adjustment range of the mobile fume exhaust port covers the crash test vehicle.

[0005] In some embodiments, the mobile fume exhaust port is arranged on an adjusting support. The adjusting support comprises: a rotating arm, the rotating arm is rotatably arranged on a fixed shaft, the fixed shaft is vertically fixedly arranged in the welding workshop, the rotating arm can rotate in a horizontal plane, and the length of the rotating arm is greater than the farthest distance between the body of the crash test vehicle and the fixed shaft; a plurality of suspension members, the plurality of suspension members are slidably arranged on the rotating arm, the plurality of suspension members are distributed and slid along the extension direction of the rotating arm, and the flexible pipeline is suspended on the rotating arm through the plurality of suspension members in the extension direction of the flexible pipeline.

[0006] In some embodiments, the adjusting support further comprises a rope discharger, the rope discharger is slidably arranged at the end of the rotating arm away from the fixed shaft, and the mobile fume exhaust port is connected with the free end of the rope in the rope discharger.

[0007] In some embodiments, the adjusting support further comprises a telescopic rod, a fixed end of the telescopic rod is fixedly connected to the end of the rotating arm away from the fixed shaft, and the movable smoke outlet is further connected to a free end of the telescopic rod, and the telescopic rod is capable of telescoping in the vertical direction.

[0008] In some embodiments, the smoke exhaust device further comprises: a first smoke concentration sensor arranged at the fixed smoke outlet; a second smoke concentration sensor arranged at the movable smoke outlet; an alarm for sending an alarm signal; and a controller in communication connection with the first smoke concentration sensor, the second smoke concentration sensor, the first valve, the second valve, the fan and the alarm.

[0009] According to a second aspect of the present application, embodiments of the present application provide a smoke exhaust method for welding a crash test vehicle, the method being performed by the smoke exhaust device described above, and the method comprising: moving the movable smoke outlet above a position to be welded on the crash test vehicle before starting welding on the crash test vehicle; starting the fan, controlling the fan to rotate at an initial rotating speed, controlling the second valve to open, and then starting welding; monitoring the smoke concentration at the fixed smoke outlet in real time; when the smoke concentration at the fixed smoke outlet changes from low to high until the first concentration threshold is broken through, controlling the first valve to open; when the smoke concentration at the fixed smoke outlet changes from high to low until the second concentration threshold is broken through, controlling the first valve to close; and the second concentration threshold is less than the first concentration threshold.

[0010] In some embodiments, when the first valve is closed, the method further comprises: monitoring the smoke concentration at the movable smoke outlet in real time; when the smoke concentration at the movable smoke outlet changes from low to high but does not break through the third concentration threshold, controlling the fan to rotate at the first rotating speed; when the smoke concentration at the movable smoke outlet changes from low to high until the third concentration threshold is broken through, controlling the rotating speed of the fan to be proportional to the smoke concentration at the movable smoke outlet; and when the smoke concentration at the movable smoke outlet changes from high to low until the fourth concentration threshold is broken through, controlling the fan to rotate at the first rotating speed, and the fourth concentration threshold is less than the third concentration threshold.

[0011] In some embodiments, when the first valve is opened, the method further comprises: obtaining a first change rate of the smoke concentration at the fixed smoke outlet; obtaining a second change rate of the smoke concentration at the movable smoke outlet; calculating a ratio of the first change rate to the second change rate; when the ratio is greater than 1, controlling the fan to rotate at the maximum rotating speed for a first preset time; and after the first preset time ends, if the ratio is still greater than 1, sending an alarm signal.

[0012] In some embodiments, the smoke exhaust method further comprises: after the first preset time ends, if the ratio is still greater than 1, sending an alarm signal.

[0013] In some embodiments, after the welding is completed, the fan is controlled to remain in the working state, and the first valve is controlled to be opened until the smoke concentration at the fixed smoke exhaust port is reduced to 0, and then the fan and the first valve are closed.

[0014] The embodiment of the present application provides the smoke exhaust device and the smoke exhaust method for the welding of the crash test vehicle, the smoke is exhausted at a short distance by moving the smoke exhaust port close to the welding point of the crash test vehicle, smoke diffused out is cleaned by supplementing suction through the fixed smoke exhaust port, and efficient smoke exhaust is realized through cooperation of the fixed smoke exhaust port and the movable smoke exhaust port, so that the influence of the welding smoke on the health of the welder is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is a schematic diagram of the smoke exhaust device provided by the embodiment of the present application;

[0017] Figure 2 is a schematic diagram of the adjusting support of the smoke exhaust device provided by the embodiment of the present application;

[0018] Figure 3 is a schematic diagram of the fixed smoke exhaust port of the smoke exhaust device provided by the embodiment of the present application.

[0019] The reference signs are as follows:

[0020] 1, fixed shaft; 2, rotating arm; 3, flexible pipeline; 4, movable smoke exhaust port; 5, rope winding device; 6, telescopic rod.

[0021] It should be understood that the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0022] The technical solutions of the preferred embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0023] The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are only used to distinguish different parts. The terms "comprise", "comprising", and similar terms mean that the elements before the term encompass the elements listed after the term, and do not exclude the possibility of also encompassing other elements. "Up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] To at least partially solve the above problems, as shown in Figure 1 According to a first aspect of the present application, embodiments of the present application provide a smoke exhaust device for welding of a crash test vehicle, welding of the crash test vehicle is carried out in a welding workshop, the smoke exhaust device comprises: a main pipeline, the main pipeline forms a channel for discharging welding smoke; a fan, the fan is arranged on the main pipeline, and the fan is used to provide negative pressure required for smoke exhaust; a first branch pipeline, the first branch pipeline is connected with the main pipeline, and the first branch pipeline is provided with a first valve for controlling opening and closing thereof; a second branch pipeline, the second branch pipeline is connected with the main pipeline, and the first branch pipeline and the second branch pipeline are connected in parallel, and the second branch pipeline is provided with a second valve for controlling opening and closing thereof; a fixed smoke exhaust port, the fixed smoke exhaust port is arranged at one end of the first branch pipeline away from the main pipeline, and the fixed smoke exhaust port is fixedly arranged at the top inside the welding workshop; a mobile smoke exhaust port, the mobile smoke exhaust port is connected with one end of the second branch pipeline away from the main pipeline through a flexible pipeline, and the mobile smoke exhaust port is adjustably arranged in the welding workshop, and the adjustment range of the position of the mobile smoke exhaust port covers the crash test vehicle.

[0025] In combination Figure 2 and Figure 3 In the present embodiment, the main pipeline can be in communication with the atmospheric environment outside the welding workshop, and the fan provides negative pressure, so that the smoke at the fixed smoke exhaust port and the mobile smoke exhaust port is sucked in, and then enters the main pipeline through the first branch pipeline and the second branch pipeline respectively. A smoke filtering device can be arranged on the main pipeline, and the smoke is filtered and collected by the smoke filtering device to prevent it from escaping into the atmospheric environment. The first valve and the second valve are respectively used to control the opening and closing of the first branch pipeline and the second branch pipeline, so as to control whether the smoke at the fixed smoke exhaust port and the mobile smoke exhaust port starts to be sucked. In the present embodiment, the mobile smoke exhaust port can be installed on an adjusting support, and the position of the mobile smoke exhaust port is changed by adjusting the adjusting support, so that the adjustment range of the position covers the crash test vehicle, thereby enabling the welding work area at each position of the crash test vehicle to be exhausted. The fixed smoke exhaust port can be installed on the ceiling of the welding workshop. The inventors have found that relying only on the mobile smoke exhaust port cannot remove all the smoke (the mobile smoke exhaust port can usually exhaust 70%-80% of the welding smoke), and part of the smoke will slowly spread upward in the welding workshop. At this time, the fixed smoke exhaust port can be used to supplement the suction of the spread smoke, so as to prevent the spread smoke from continuously accumulating and harming the health of the welders.

[0026] The fume extraction device for welding a crash test vehicle provided in the embodiments of this application achieves close-range fume extraction by moving the fume extraction port closer to the welding point of the crash test vehicle; at the same time, it removes diffused fumes by supplementing absorption through the fixed fume extraction port. The fixed fume extraction port and the moving fume extraction port work together to achieve efficient fume extraction and reduce the health impact of welding fumes on welding personnel.

[0027] like Figure 2 As shown, in some embodiments, the movable exhaust port 4 is mounted on an adjusting bracket, which includes: a rotating arm 2, which is rotatably mounted on a fixed shaft 1, the fixed shaft 1 being vertically fixed in the welding workshop, the rotating arm 2 being able to rotate in a horizontal plane, and the length of the rotating arm 2 being greater than the furthest distance between the vehicle body of the crash test vehicle and the fixed shaft 1; and multiple suspension components, which are slidably mounted on the rotating arm 2, the multiple suspension components being distributed and sliding along the extension direction of the rotating arm 2, and the flexible pipe 3 being suspended on the rotating arm 2 by the multiple suspension components in its own extension direction. It is understandable that the crash test vehicle is large in size, irregular in shape, and has variable welding point positions. In this embodiment, the fixed shaft 1 can be set on the wall of the welding workshop at a preset distance from the ground. The rotating arm 2 can rotate around the fixed shaft 1 to adjust the horizontal position of the movable exhaust port 4. The length of the rotating arm 2 is greater than the farthest distance between the crash test vehicle body and the fixed shaft 1, so that the range of motion of the rotating arm 2 can cover the entire body of the crash test vehicle. At the same time, the sliding of the suspension component on the rotating arm 2 drives the flexible pipe 3 to move, and then drives the movable exhaust port 4 to move, so that the movable exhaust port 4 can move directly above the welding position of the vehicle body to directly suck up the smoke and dust generated at the welding point and reduce the diffusion of smoke and dust. The above-mentioned adjustment bracket structure is simple, and most of the weight of the flexible pipe 3 is distributed by the rotating arm 2, which makes it easier to adjust the position of the movable exhaust port 4. For example, the suspension component can be a hanging ring, hook, or other structure, and the rotating arm 2 can be provided with a sliding groove. The suspension component cooperates with the rotating arm 2 through the sliding groove and rail structure.

[0028] In some embodiments, the adjusting bracket further includes a rope arranger 5, which is slidably disposed at the end of the rotating arm 2 away from the fixed axis 1. The movable exhaust port 4 is connected to the free end of the rope in the rope arranger 5. The rope arranger 5 can slide along the extension direction of the rotating arm 2. It is understood that different positions of the crash test vehicle have different heights. In this embodiment, the vertical height of the movable exhaust port 4 can be quickly adjusted by retracting and extending the rope through the rope arranger 5. This allows the movable exhaust port 4 to better adapt to different height positions of the crash test vehicle body, further reducing smoke diffusion and improving the smoke extraction effect. The rope arranger 5 can be a manual rope arranger or an electric rope arranger.

[0029] In some embodiments, the adjusting support further comprises a telescopic rod 6, a fixed end of the telescopic rod 6 is fixedly connected to an end of the rotating arm 2 away from the fixed shaft 1, the movable smoke outlet 4 is further connected to a free end of the telescopic rod 6, and the telescopic rod 6 is capable of telescoping in a vertical direction. In this embodiment, by arranging the telescopic rod 6, the swing of the movable smoke outlet 4 in the horizontal plane can be limited, so that the movable smoke outlet 4 can be aligned with the welding position, the fixation is more reliable, the smoke diffusion is further reduced, and the smoke exhaust effect is ensured.

[0030] In some embodiments, the smoke exhaust device further comprises a first smoke concentration sensor arranged at the fixed smoke outlet, a second smoke concentration sensor arranged at the movable smoke outlet, an alarm for sending an alarm signal, and a controller in communication connection with the first smoke concentration sensor, the second smoke concentration sensor, the first valve, the second valve, the fan and the alarm. In this embodiment, the first valve and the second valve can both be electromagnetic valves, through the above structure, intelligent control of smoke exhaust can be achieved, and the smoke exhaust efficiency is improved; at the same time, the alarm can send an alarm signal to timely remind the welder of abnormal smoke concentration.

[0031] In some embodiments, the smoke exhaust device can comprise a plurality of adjusting supports, each adjusting support is correspondingly provided with a movable smoke outlet, and the smoke exhaust device can further comprise a corresponding number of parallel branch pipes and valves, and each branch pipe is connected to the corresponding movable smoke outlet through a flexible pipeline. Through the plurality of movable smoke outlets, smoke exhaust can be simultaneously performed at a plurality of welding points.

[0032] According to a second aspect of the present application, the embodiments of the present application provide a smoke exhaust method for welding of a crash test vehicle. The method is performed by the smoke exhaust device described above, and the method comprises the following steps: before starting welding on the crash test vehicle, moving the movable smoke outlet above a position to be welded on the crash test vehicle; starting the fan, controlling the fan to rotate at an initial rotating speed, controlling the second valve to open, and then starting welding; monitoring the smoke concentration at the fixed smoke outlet in real time; when the smoke concentration at the fixed smoke outlet changes from low to high until the first concentration threshold is broken, controlling the first valve to open; when the smoke concentration at the fixed smoke outlet changes from high to low until the second concentration threshold is broken, controlling the first valve to close; the second concentration threshold is less than the first concentration threshold.

[0033] In the embodiment, before welding, the movable exhaust port is moved to the position in advance, the second valve is opened, and the smoke at the initial stage of welding is sucked near; in the welding, the first valve is automatically opened and closed according to the concentration of the fixed exhaust port, and the diffused smoke is supplemented and sucked, at this time, the speed of the fan can be increased, for example, to the maximum speed; when the smoke concentration is reduced again after being supplemented and sucked through the fixed exhaust port, the first valve is closed to ensure that the movable exhaust port has sufficient negative pressure; the second concentration threshold is less than the first concentration threshold, which can prevent the smoke concentration from repeatedly breaking through the first concentration threshold, causing the first valve to open and close repeatedly, and affecting the normal operation of the smoke exhaust device. In the embodiment, the above operations can be performed by the controller, so that the opening of the valve and the intelligent adjustment of the speed of the fan can be automatically adjusted according to the smoke concentration, and the operation burden of the welder is reduced.

[0034] In some embodiments, when the first valve is closed, further comprising: monitoring the smoke concentration at the movable exhaust port in real time; when the smoke concentration at the movable exhaust port changes from low to high but does not break through the third concentration threshold, controlling the fan to rotate at the first speed; when the smoke concentration at the movable exhaust port changes from low to high until it breaks through the third concentration threshold, the speed of the fan is proportional to the smoke concentration at the movable exhaust port; when the smoke concentration at the movable exhaust port changes from high to low until it breaks through the fourth concentration threshold, the fan is controlled to rotate at the first speed, and the fourth concentration threshold is less than the third concentration threshold.

[0035] In the embodiment, when the smoke is exhausted through the movable exhaust port alone, when the smoke concentration is low (less than the third concentration threshold), the fan operates at a stable first speed, which can be the initial speed of the fan or slightly greater than the initial speed to reduce energy consumption; when the smoke concentration is high, the speed of the fan is adjusted in proportion to the smoke concentration, and the fan has a high speed under a high smoke concentration, thereby providing sufficient negative pressure, ensuring the exhaust effect, and reducing the diffusion of smoke; when the smoke concentration is reduced again, the fan is controlled to rotate at the first speed to reduce energy consumption; the fourth concentration threshold is less than the third concentration threshold, which can prevent the smoke concentration from repeatedly breaking through the third concentration threshold, affecting the stable operation of the smoke exhaust device.

[0036] In some embodiments, when the first valve is opened, the method further comprises: obtaining a first change rate of the smoke concentration at the fixed smoke outlet; obtaining a second change rate of the smoke concentration at the mobile smoke outlet; calculating a ratio of the first change rate to the second change rate; when the ratio is greater than 1, controlling the fan to rotate at the maximum speed for a first preset time; after the first preset time, if the ratio is less than 1 and both the first change rate and the second change rate are negative, controlling the fan to rotate at the initial speed. In this embodiment, when the ratio is greater than 1, it means that the smoke diffusion speed is too fast, the smoke continuously accumulates in the welding workshop, the concentration increases, and the health of the welder is endangered. At this time, the fan is controlled to rotate at the maximum speed to provide sufficient negative pressure and accelerate the smoke exhaust speed. After the first preset time, if the ratio is less than 1 and both the first change rate and the second change rate are negative, it means that the smoke diffusion is controlled and the smoke concentration is continuously reduced. At this time, the fan can be controlled to rotate at the initial speed to reduce energy consumption.

[0037] In some embodiments, the smoke exhaust method further comprises: after the first preset time, if the ratio is still greater than 1, an alarm signal is sent. In this embodiment, after the fan rotates at the maximum speed for the first preset time, the smoke diffusion is still not controlled. At this time, an alarm signal can be sent to remind the welder of the health risk and to suspend welding and leave the welding workshop. At the same time, it can be checked whether the smoke exhaust device has a fault.

[0038] In some embodiments, after the welding is completed, the fan is controlled to remain in the working state, and the first valve is controlled to be opened until the smoke concentration at the fixed smoke outlet is reduced to 0, and the fan and the first valve are closed. In this embodiment, after the welding is completed, the first valve is continuously opened and the fan is continuously worked. At this time, the residual smoke can be completely sucked away through the fixed smoke outlet, the air in the workshop is purified, and the subsequent working environment is ensured.

[0039] Based on the above embodiments of the present application, one technical feature of one embodiment can be beneficially combined with one or more other embodiments without explicit negation or conflict.

[0040] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for welding fume exhaust of a crash test vehicle, the method being performed by a fume exhaust device, the welding of the crash test vehicle being performed in a welding workshop, characterized in that the fume exhaust device comprises: a main pipeline forming a channel for welding fume exhaust; a fan provided on the main pipeline, the fan being used to provide negative pressure required for fume exhaust; a first branch pipeline connected with the main pipeline, the first branch pipeline being provided with a first valve for controlling the opening and closing thereof; a second branch pipeline connected with the main pipeline, the first branch pipeline and the second branch pipeline being connected in parallel, the second branch pipeline being provided with a second valve for controlling the opening and closing thereof; a fixed fume exhaust port provided at an end of the first branch pipeline away from the main pipeline, the fixed fume exhaust port being fixedly provided at the top inside the welding workshop; a mobile fume exhaust port connected with an end of the second branch pipeline away from the main pipeline through a flexible pipeline, the mobile fume exhaust port being adjustably provided in the welding workshop, a position adjustment range of the mobile fume exhaust port covering the crash test vehicle; a first fume concentration sensor provided at the fixed fume exhaust port; a second fume concentration sensor provided at the mobile fume exhaust port; an alarm for sending an alarm signal; a controller in communication connection with the first fume concentration sensor, the second fume concentration sensor, the first valve, the second valve, the fan and the alarm; the method comprising: moving the mobile fume exhaust port above a welding position of the crash test vehicle before starting welding of the crash test vehicle; starting the fan, controlling the fan to rotate at an initial rotating speed, controlling the second valve to be opened, and then starting welding; monitoring the fume concentration at the fixed fume exhaust port in real time; when the fume concentration at the fixed fume exhaust port changes from low to high until a first concentration threshold is broken through, controlling the first valve to be opened and increasing the rotating speed of the fan to a maximum rotating speed; when the fume concentration at the fixed fume exhaust port changes from high to low until a second concentration threshold is broken through, controlling the first valve to be closed; the second concentration threshold being less than the first concentration threshold; when the first valve is closed, further comprising: monitoring the fume concentration at the mobile fume exhaust port in real time; when the fume concentration at the mobile fume exhaust port changes from low to high but does not break through a third concentration threshold, controlling the fan to rotate at a first rotating speed, the first rotating speed being equal to the initial rotating speed of the fan; when the fume concentration at the mobile fume exhaust port changes from low to high until the third concentration threshold is broken through, controlling the rotating speed of the fan to be proportional to the fume concentration at the mobile fume exhaust port; when the fume concentration at the mobile fume exhaust port changes from high to low until a fourth concentration threshold is broken through, controlling the fan to rotate at the first rotating speed, the fourth concentration threshold being less than the third concentration threshold; when the first valve is opened, further comprising: obtaining a first change rate of the fume concentration at the fixed fume exhaust port; obtaining a second change rate of the fume concentration at the mobile fume exhaust port. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ calculating a ratio of the first change rate and the second change rate; when the ratio is greater than 1, controlling the fan to rotate at a maximum rotating speed for a first preset time; after the first preset time, if the ratio is still greater than 1, an alarm signal is sent. after the welding is completed, the fan is controlled to keep working, and the first valve is controlled to be opened until the smoke concentration at the fixed smoke outlet is reduced to 0, and then the fan and the first valve are closed.

2. The smoke exhaust method according to claim 1, characterized by the mobile smoke outlet is arranged on an adjusting support, and the adjusting support comprises:

3. The method of claim 1, wherein a rotating arm, which is rotatably arranged on a fixed shaft, the fixed shaft is vertically fixed in the welding workshop, the rotating arm can rotate in a horizontal plane, and the length of the rotating arm is greater than the farthest distance between the body of the collision test vehicle and the fixed shaft; a plurality of suspension members, which are slidably arranged on the rotating arm, the plurality of suspension members are distributed and slid along the extension direction of the rotating arm, and the flexible pipeline is suspended on the rotating arm through the plurality of suspension members in the extension direction of the flexible pipeline. the adjusting support further comprises a rope arranging device, which is slidably arranged at the end of the rotating arm away from the fixed shaft, and the mobile smoke outlet is connected with the free end of the rope in the rope arranging device.

4. The smoke exhaust method according to claim 3, characterized in that the adjusting support further comprises a telescopic rod, the fixed end of the telescopic rod is fixedly connected at the end of the rotating arm away from the fixed shaft, and the mobile smoke outlet is further connected with the free end of the telescopic rod, and the telescopic rod can be telescopically extended in the vertical direction.

5. The method of claim 4, wherein ​

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