Large steel structure welding fume closed collection system and method

Abstract

The invention discloses a large steel structure welding fume closed collection system and method, and the system comprises a steel structure main body frame which provides a mounting foundation for all parts; the omni-directional moving chassis is arranged at the bottom of the steel structure main body frame and realizes omni-directional movement of the steel structure main body frame; the operation platform is arranged in the steel structure main body frame and is used for providing climbing operation; the liftable door curtains are arranged at the inlet and the outlet of the steel structure main body frame and are used for isolating smoke dust; and the distributed air sucking and blowing duct is arranged at the top of the steel structure main body frame, is connected with dust removal equipment and is used for sucking welding fume and providing clean air. The traditional outdoor operation and scattered dust removal mode is broken through, and organized treatment of the whole process of the welding fume is achieved.

Description

Technical Field

[0001] This invention relates to steel structure manufacturing technology, and more specifically, to a closed collection system and method for welding fumes from large steel structures. Background Technology

[0002] In the field of steel structure manufacturing, quay cranes, as typical large steel structures, have complex structures and welding points that are not only scattered but also highly mobile. Outdoor welding operations are also easily affected by environmental factors such as wind along the river and confined working spaces. Traditional welding fume control solutions, such as mobile dust collection devices and partially enclosed hoods, have significant limitations: firstly, the limited space on the working surface prevents complete coverage of the welding area; secondly, the frequent changes in welding points result in insufficient equipment mobility. Especially under wind interference, the rapid diffusion of welding fumes makes it difficult to effectively collect fumes even with high negative pressure equipment, failing to achieve the expected control effect.

[0003] Currently, the construction of green factories has become a mainstream trend in the industry, and reducing fugitive welding fume emissions and improving environmental governance have become important needs for steel structure manufacturing enterprises. Therefore, developing a welding fume collection and purification method that can adapt to the characteristics of large-scale steel structure field operations and takes into account airtightness, flexibility, and high efficiency can achieve effective control of welding fumes and the green production transformation of enterprises. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a closed collection system and method for welding fumes of large steel structures, which breaks through the traditional open-air operation and scattered dust removal mode and realizes the organized treatment of welding fumes throughout the entire process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The first aspect of this invention provides a closed collection system for welding fumes from large steel structures, comprising:

[0007] The steel main frame provides the installation foundation for all components;

[0008] An omnidirectional mobile chassis is located at the bottom of the main steel structure frame, enabling the omnidirectional movement of the main steel structure frame;

[0009] The work platform is located inside the main steel structure frame and provides access for working at height.

[0010] A liftable door curtain is installed at the inlet and outlet of the main steel structure frame to isolate smoke and dust;

[0011] A distributed suction and blowing air duct is located at the top of the main steel structure frame and is connected to the dust removal equipment to absorb welding fumes and provide clean air.

[0012] Preferably, the main steel frame includes a main structure and color steel plates;

[0013] The main structure is a steel structure work shed made of welded steel profiles, including the walls and the roof.

[0014] The color steel plate is fixed to the wall and the ceiling with self-tapping screws.

[0015] Preferably, the omnidirectional mobile chassis includes a mounting structure, and drive wheels, a trolley running mechanism, and a servo steering mechanism disposed on the mounting structure;

[0016] The drive wheel is mounted on the mounting structure via a rotary mechanism;

[0017] The mounting structure is located on the bottom beam of the main structure;

[0018] The trolley running mechanism provides power to the drive wheels;

[0019] The servo steering mechanism receives steering commands from the control system and controls the steering angle of the drive wheels.

[0020] Preferably, the trolley traveling mechanism includes a motor and a reducer;

[0021] The output end of the motor is connected to the input end of the reducer;

[0022] The output end of the reducer is connected to the drive wheel;

[0023] The servo steering mechanism includes a servo motor, an angle encoder, and a limit switch;

[0024] The servo motor controls the steering angle of the drive wheel;

[0025] The angle encoder feeds back the actual steering angle to the control system in real time;

[0026] The limit switch prevents the drive wheel from over-steering.

[0027] Preferably, the work platform is mounted on a column on the wall.

[0028] The surface of the work platform is covered with anti-slip material, and protective railings are installed around it.

[0029] The width of the work platform is designed to be adjustable.

[0030] Preferably, the liftable door curtain includes a PVC door curtain, a guide rail, and a geared motor;

[0031] The guide rails are located at the inlet and outlet positions of the main structure and are connected and fixed to the walls on both sides.

[0032] The upper end of the PVC door curtain is wound around the drive shaft of the geared motor;

[0033] The PVC door curtain is connected to the guide rail via pulleys;

[0034] The geared motor drives the drive shaft to rotate in both directions, thereby enabling the PVC door curtain to rise and fall.

[0035] Preferably, the distributed suction and blowing air duct includes a main duct, branch ducts, and air inlets;

[0036] The main pipeline is fixed to the top surface and connected to the dust removal equipment;

[0037] The branch pipes are provided in multiple sections, symmetrically connected to both sides of the main pipe;

[0038] The air intake is provided in multiple locations, evenly distributed on the branch pipe.

[0039] Preferably, the dust removal equipment is mounted on a column on the wall.

[0040] The columns on the wall are also equipped with a welding fume purification system to blow the welding fumes upwards.

[0041] Preferably, the distributed suction and blowing air duct is made of aluminum alloy.

[0042] The second aspect of this invention provides a method for enclosed collection of welding fumes from large steel structures, comprising the following steps performed using the enclosed collection system for welding fumes from large steel structures provided in the first aspect of this invention:

[0043] S1. Confirm the location of the welding points of the large steel structure and the surrounding working space to ensure that the moving path of the large steel structure welding fume enclosed collection system is unobstructed.

[0044] S2, move the large steel structure welding fume enclosed collection system above the welding station so that the welding point is within the coverage area of ​​the main structure of the large steel structure welding fume enclosed collection system;

[0045] S3, lower the liftable door curtain of the large steel structure welding fume enclosed collection system to form an enclosed working space inside the main structure;

[0046] S4, turn on the dust removal equipment of the large steel structure welding fume closed collection system, start the welding equipment to weld, the welding fume flows upward through the airflow field of the welding fume purification system of the large steel structure welding fume closed collection system, and is then transported to the dust removal equipment through the air intake, branch pipe and main pipe of the large steel structure welding fume closed collection system. The filtered and qualified air is then discharged back through the air outlet pipe of the purification equipment.

[0047] S5. After welding is completed, the dust removal equipment is turned off, the liftable door curtain rises, and the large steel structure welding fume enclosed collection system is moved to the designated storage area.

[0048] The large-scale steel structure welding fume enclosed collection system and method provided by this invention has the following beneficial effects:

[0049] (1) Breaking through the traditional open-air operation and scattered dust removal model, an innovative welding fume collection and purification method of "enclosed space + directional airflow guidance + full-process purification" is adopted, transforming the traditional open-air operation mode into a mobile welding fume enclosed collection shed, thus isolating the unorganized diffusion of fumes. "Top suction and bottom blowing" air supply and suction ducts are arranged inside the shed. Utilizing the buoyancy of the welding fumes themselves, the fumes are guided to flow in a directional and orderly manner along a preset path to the collection port. Through the through-duct system, the captured fumes are sent to the dust removal and purification equipment, ultimately completing the organized management of the entire process from "source capture → directional transportation → high-efficiency purification → standard emission", completely replacing the traditional passive and scattered treatment mode.

[0050] (2) Innovate an integrated, omnidirectional mobile large steel structure welding fume enclosed collection shed, which innovatively integrates the working space, purification system and power chassis into one unit.

[0051] (3) Innovatively utilize the synergistic effect of "upward suction negative pressure traction + downward blowing airflow push + welding fume buoyancy" to guide the directional flow of fumes. An innovative distributed suction and blowing duct design enables on-demand allocation, based on the thermal buoyancy characteristics of welding fumes and the principle of directional airflow guidance. A negative pressure suction port is set at the top of the work shed to form the main traction force; an air outlet is set at the lower side to create upward and inward pushing airflow. Utilizing the thermal buoyancy naturally generated by the welding fumes after heating, a stable, unidirectional "pneumatic conveying channel" is constructed inside the shed, which can accurately guide the fumes from the generation point to the collection point, fundamentally solving the drawbacks of easy fume diffusion and low capture efficiency in the traditional single negative pressure suction mode.

[0052] (4) An innovative distributed suction and blowing air duct design enables on-demand airflow allocation and efficient coverage of the welding station. Compared with traditional single duct systems, this design innovatively adds branch pipes, control valves, and dedicated suction ports to the main duct, constructing an airflow distribution network. Figure 6 As shown, the network supports simultaneous operation of multiple workstations. Each workstation is equipped with an independent airflow adjustment device, which can precisely control the airflow parameters of the area and ensure that a stable and sufficient capture wind speed can be formed at the air intake of each welding point. This enables the synchronous and efficient capture of welding fumes from multiple sources and in a dispersed manner, fundamentally avoiding the problem of fume diffusion caused by uneven airflow distribution.

[0053] (5) An innovative integrated "mobile integrated welding workstation" model has been developed, breaking through the limitations of traditional welding operations where equipment is scattered and functions are limited. The welding power source, gas source, wire feeding system, welding fume purification system, and elevated work platform are innovatively integrated into a fully mobile enclosed shed. Operators can complete welding tasks by entering the workstation without relying on external auxiliary equipment or frequent entry and exit for transportation. This transforms the traditional "workpiece-centered" decentralized operation mode into a "welder-centered" centralized operation mode, realizing the process reengineering of large steel structure welding operations. Attached Figure Description

[0054] Figure 1 This is a front view schematic diagram of the large-scale steel structure welding fume enclosed collection system of the present invention;

[0055] Figure 2 This is a side view schematic diagram of the large-scale steel structure welding fume enclosed collection system of the present invention;

[0056] Figure 3 This is a schematic diagram of the main steel frame of the large steel structure welding fume enclosed collection system of the present invention;

[0057] Figure 4 This is a schematic diagram of the omnidirectional mobile chassis in the large steel structure welding fume enclosed collection system of the present invention. (a) is the front view, (b) is a schematic diagram of the AA direction in (a), and (c) is a schematic diagram of the BB direction in (a).

[0058] Figure 5 This is a schematic diagram of the retractable door curtain in the large steel structure welding fume enclosed collection system of the present invention;

[0059] Figure 6 This is a schematic diagram of the distributed suction and blowing air duct in the large steel structure welding fume enclosed collection system of the present invention;

[0060] Figure 7 This is an overall schematic diagram of the large-scale steel structure welding fume enclosed collection system of the present invention;

[0061] Figure 8 This is a schematic diagram of the usage status of the large-scale steel structure welding fume enclosed collection system of the present invention. Detailed Implementation

[0062] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] Combination Figure 1 , Figure 2 and Figure 8 As shown, the present invention provides a closed collection system for welding fumes from large steel structures, comprising:

[0064] The steel main frame 1 is the rigid support and protection structure, providing the installation foundation for all components.

[0065] The omnidirectional mobile chassis 2 is installed at the bottom of the steel structure main frame 1, enabling the steel structure main frame 1 to move omnidirectionally in all directions, including forward and backward, left and right, and rotating in place.

[0066] The work platform 3 is installed inside the main steel frame 1 to provide operators with access for working at height.

[0067] The liftable door curtain 4 is installed at the inlet and outlet of the steel main frame 1 to isolate smoke and dust, and also to prevent wind and rain.

[0068] The distributed suction and blowing air duct 5 is installed on the top of the steel structure main frame 1 and connected to the dust removal equipment 6 to absorb welding fumes and provide clean air.

[0069] A hydrogen dioxide welding machine and a control box are placed on one side of the main steel frame 1 to enable the synchronous movement of all equipment and form a complete work unit.

[0070] Combination Figure 3 The steel structure main frame 1 includes a main structure 11 and a color steel plate 12.

[0071] The main structure 11 is a steel structure work shed made of welded steel profiles. The nodes of each component are rigidly connected by welding, including the walls and the top.

[0072] The color steel plate 12 is fixed to the wall and ceiling with self-tapping screws to enhance the sealing and protection of the work shed.

[0073] The work platform 3 is installed on the column on the wall.

[0074] The surface of work platform 3 is covered with anti-slip material to prevent workers from slipping.

[0075] The width of the work platform 3 is designed to be retractable and adjustable, allowing it to be extended or retracted according to work requirements to suit different tasks.

[0076] Protective railings 31 are installed around the work platform 3 to ensure the safety of the workers.

[0077] Combination Figure 4 As shown, the omnidirectional mobile chassis 2 includes a mounting structure 21, and drive wheels 22, a trolley running mechanism 23 and a servo steering mechanism 24 disposed on the mounting structure 21.

[0078] The drive wheel 22 is mounted on the mounting structure 21 via a slewing mechanism 25, which provides the drive wheel 22 with omnidirectional steering capability.

[0079] The mounting structure 21 is installed on the bottom beam of the main structure 11. Driven by a motor, it enables the movement of the work shed and allows it to move forward, backward, left, right, and rotate in place. During lateral movement, it can control the straightness and prevent deviation.

[0080] The trolley traveling mechanism 23 provides power to the drive wheel 22. The torque is output by the motor and transmitted to the drive wheel 22 after being adjusted and increased by the speed reducer.

[0081] The servo steering mechanism 24 receives steering commands from the control system and precisely controls the steering angle through the servo motor; the angle encoder provides real-time feedback on the actual steering position, forming a closed-loop control to ensure steering accuracy; the limit switch prevents oversteering and protects the mechanism from damage.

[0082] Combination Figure 5 As shown, the liftable curtain 4 is installed at the inlet and outlet of the main structure. The liftable curtains on both sides are designed to form a closed working environment, isolate external wind interference, and prevent the spread of welding fumes. It includes a PVC curtain 41, a guide rail 42, and a geared motor 43.

[0083] PVC door curtain 41 is waterproof and windproof, and can effectively isolate the environment inside and outside the work shed.

[0084] The guide rail 42 is installed at the inlet and outlet positions of the main structure 11 and is connected and fixed to the side walls.

[0085] The upper end of the PVC curtain 41 is wound around the drive shaft of the geared motor 43.

[0086] The PVC curtain 41 is connected to the guide rail 42 via pulleys to ensure a smooth and stable lifting process.

[0087] The geared motor 43 provides power to drive the drive shaft to rotate in both directions, thereby driving the PVC curtain 41 to move up and down quickly and smoothly along the guide rail 42.

[0088] The adjustable curtain 4 allows the curtain to be lowered during operation to form a seal, and to be quickly raised during passage.

[0089] Combination Figure 6 As shown, the distributed suction and blowing air duct 5 includes a main pipe 51, a branch pipe 52, and an air intake 53.

[0090] The distributed suction and blowing air duct 5 is made of aluminum alloy and is distributed on the top and sides of the main steel frame 1, adopting a distributed layout of "top suction and side delivery".

[0091] The main pipe 51 is fixed to the top surface and connected to the dust removal equipment 6.

[0092] There are multiple branch pipes 52, which are symmetrically connected to both sides of the main pipe 51.

[0093] Multiple air intakes 53 are provided and are evenly distributed on the branch pipes 52.

[0094] The dust removal equipment 6 is installed on the column on the wall.

[0095] The columns on the wall are also equipped with a welding fume purification system 7, which is used to blow the welding fumes upward.

[0096] A top-mounted negative pressure collection duct is located at the top of the work shed, serving as the main air intake to actively capture welding fumes that rise naturally due to heat, achieving source collection. Side-mounted directional air supply ducts are located on the sides of the work shed, serving as air outlets. These not only replenish fresh air but also "push" any stray fumes that fail to rise in time towards the top air intake, enhancing the collection effect. Through this layout and airflow adjustment, a coordinated directional airflow field is created inside the work shed, achieving efficient guidance and collection of fumes.

[0097] Combination Figure 7 and Figure 8 As shown, the present invention also provides a method for enclosed collection of welding fumes from large steel structures. The following steps are performed using the enclosed collection system for welding fumes from large steel structures of the present invention:

[0098] S1. Confirm the location of welding points and surrounding work space of large steel structures in advance to ensure that the movement path of the large steel structure welding fume enclosed collection system is unobstructed.

[0099] S2, start the control box of the large steel structure welding fume enclosed collection system, turn on the drive system, and move the large steel structure welding fume enclosed collection system above the welding station so that the welding point is within the coverage area of ​​the main structure 11 of the large steel structure welding fume enclosed collection system.

[0100] S3, lower (close) the liftable curtain 4 of the large steel structure welding fume enclosed collection system, check the fit between the PVC curtain 41 and the component surface and the main structure 11, ensure there are no obvious gaps, and form an enclosed working space inside the main structure 11.

[0101] S4, turn on the dust removal equipment 6 of the large steel structure welding fume closed collection system, start the welding equipment (welding power source 8, wire feeding system 9) to perform welding, the welding fume flows upward through the airflow field of the welding fume purification system 7 of the large steel structure welding fume closed collection system, and then is sent to the dust removal equipment 6 through the air intake 53, branch pipe 52 and main pipe 51 of the large steel structure welding fume closed collection system. The filtered and qualified air is then discharged back through the air outlet pipe of the purification equipment.

[0102] S5. After welding is completed, the dust removal equipment 6 is turned off, and the liftable curtain 4 is raised to move the large steel structure welding fume enclosed collection system to the designated storage area.

[0103] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A closed collection system for welding fumes from large steel structures, characterized in that, include: The steel main frame provides the installation foundation for all components; An omnidirectional mobile chassis is located at the bottom of the main steel structure frame, enabling the omnidirectional movement of the main steel structure frame; The work platform is located inside the main steel structure frame and provides access for working at height. A liftable door curtain is installed at the inlet and outlet of the main steel structure frame to isolate smoke and dust; A distributed suction and blowing air duct is located at the top of the main steel structure frame and is connected to the dust removal equipment to absorb welding fumes and provide clean air.

2. The large-scale steel structure welding fume enclosed collection system according to claim 1, characterized in that: The steel structure main frame includes the main structure and color steel plates; The main structure is a steel structure work shed made of welded steel profiles, including the walls and the roof. The color steel plate is fixed to the wall and the ceiling with self-tapping screws.

3. The enclosed collection system for welding fumes of large steel structures according to claim 2, characterized in that: The omnidirectional mobile chassis includes a mounting structure, and drive wheels, a trolley running mechanism, and a servo steering mechanism mounted on the mounting structure. The drive wheel is mounted on the mounting structure via a rotary mechanism; The mounting structure is located on the bottom beam of the main structure; The trolley running mechanism provides power to the drive wheels; The servo steering mechanism receives steering commands from the control system and controls the steering angle of the drive wheels.

4. The large-scale steel structure welding fume enclosed collection system according to claim 3, characterized in that: The trolley running mechanism includes a motor and a reducer; The output end of the motor is connected to the input end of the reducer; The output end of the reducer is connected to the drive wheel; The servo steering mechanism includes a servo motor, an angle encoder, and a limit switch; The servo motor controls the steering angle of the drive wheel; The angle encoder feeds back the actual steering angle to the control system in real time; The limit switch prevents the drive wheel from over-steering.

5. The enclosed collection system for welding fumes of large steel structures according to claim 2, characterized in that: The work platform is mounted on the column of the wall; The surface of the work platform is covered with anti-slip material, and protective railings are installed around it. The width of the work platform is designed to be adjustable.

6. The enclosed collection system for welding fumes of large steel structures according to claim 2, characterized in that: The liftable door curtain includes a PVC door curtain, a guide rail, and a geared motor; The guide rails are located at the inlet and outlet positions of the main structure and are connected and fixed to the walls on both sides. The upper end of the PVC door curtain is wound around the drive shaft of the geared motor; The PVC door curtain is connected to the guide rail via pulleys; The geared motor drives the drive shaft to rotate in both directions, thereby raising and lowering the PVC door curtain.

7. The enclosed collection system for welding fumes of large steel structures according to claim 2, characterized in that: The distributed suction and blowing air duct includes a main duct, branch ducts, and suction outlets; The main pipeline is fixed to the top surface and connected to the dust removal equipment; The branch pipes are provided in multiple sections, symmetrically connected to both sides of the main pipe; The air intake is provided in multiple locations, evenly distributed on the branch pipe.

8. The enclosed collection system for welding fumes of large steel structures according to claim 7, characterized in that: The dust removal equipment is mounted on the column of the wall. The columns on the wall are also equipped with a welding fume purification system to blow the welding fumes upwards.

9. The enclosed collection system for welding fumes of large steel structures according to claim 7, characterized in that: The distributed suction and blowing air duct is made of aluminum alloy.

10. A method for enclosed collection of welding fumes from large steel structures, characterized in that, The following steps are performed using the large steel structure welding fume enclosed collection system as described in any one of claims 1-9: S1. Confirm the location of the welding points of the large steel structure and the surrounding working space to ensure that the moving path of the large steel structure welding fume enclosed collection system is unobstructed. S2, move the large steel structure welding fume enclosed collection system above the welding station so that the welding point is within the coverage area of ​​the main structure of the large steel structure welding fume enclosed collection system; S3, lower the liftable door curtain of the large steel structure welding fume enclosed collection system to form an enclosed working space inside the main structure; S4, turn on the dust removal equipment of the large steel structure welding fume closed collection system, start the welding equipment to weld, the welding fume flows upward through the airflow field of the welding fume purification system of the large steel structure welding fume closed collection system, and is then transported to the dust removal equipment through the air intake, branch pipe and main pipe of the large steel structure welding fume closed collection system. The filtered and qualified air is then discharged back through the air outlet pipe of the purification equipment. S5. After welding is completed, the dust removal equipment is turned off, the liftable door curtain rises, and the large steel structure welding fume enclosed collection system is moved to the designated storage area.

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