Multipurpose air suction trolley, welding smoke removal workbench and cutting dust removal workbench

Abstract

The utility model provides a multipurpose air suction trolley, a welding smoke removal working table and a cutting dust removal working table, which are applied to the technical field of machining dust removal devices, and are characterized by comprising a sliding air duct and a trolley shell communicated with the sliding air duct, an air suction opening is formed in the trolley shell, the sliding air duct is in transmission connection with a conveying belt, the trolley shell is rotationally connected with a roller shaft, and the conveying belt is wound on the roller shaft and drives the trolley shell to slide on the sliding air duct in a reciprocating mode; the trolley shell is provided with a sealing piece which is attached to the conveying belt and the sliding air channel so as to compensate the gap between the trolley shell and the sliding air channel. The trolley has the technical effects that the trolley shell has two interface forms of the side wall and the top, and different interfaces can be selected according to actual conditions, so that the trolley has various functions; the dust removal device can move along with movement of a cutting machine or a welding robot, so that dust generated at different cutting or welding positions is removed, and the dust removal effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining dust removal devices, in particular to a multi-purpose air suction trolley, a welding smoke removal workbench and a cutting dust removal workbench. Background Art

[0002] At present, during mechanical processing, gantry plasma laser cutting machines are often used for steel plate cutting. During cutting, a large number of sparks and large particles of smoke and dust are often generated. These sparks will splash around, which is not conducive to personal safety. In addition, large particles of smoke and dust are mixed with metal powder, etc., which will harm the health of workers if inhaled by the human body. The conventional dust collection method is to set up dust removal equipment next to the cutting equipment, but the dust removal equipment is fixed and it is difficult to capture the smoke generated by the cutting machine moving to different positions, and the smoke removal effect is not good. If traditional water bed dust removal is used, it will also cause rust on the raw materials.

[0003] In addition, among the advanced automated equipment in the welding field today, robot welding is becoming more and more common. For multi-axis robot welding, the welding robot can move in different directions for welding, but the dust removal equipment is not convenient to move with the robot in different directions all the time. In addition, due to the space limitations in special occasions, it is impossible to achieve this by relying solely on pipe vacuuming. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-purpose suction trolley, a welding smoke removal workbench and a cutting dust removal workbench, which have the advantage of being able to move with the movement of a cutting machine or a welding robot, thereby removing smoke and dust generated at different cutting or welding positions, which is beneficial to improving the dust removal effect.

[0005] In order to achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0006] A multi-purpose air suction trolley comprises a sliding air duct and a trolley shell connected to the sliding air duct; an air suction port is provided on the trolley shell.

[0007] The sliding air duct is connected to a conveyor belt, and the trolley housing is rotatably connected to a roller shaft. The conveyor belt is wound around the roller shaft and drives the trolley housing to slide back and forth on the sliding air duct.

[0008] The trolley housing is provided with a sealing sheet which is attached to the conveyor belt and the sliding air duct to compensate for the gap between the trolley housing and the sliding air duct.

[0009] Through the above technical scheme, the sliding air duct is used to support the trolley shell and provide a sliding platform for the sliding of the trolley shell; the trolley shell slides on the sliding air duct and can follow the cutting machine or welding robot to move or stop at any time; the air suction port is used to absorb the smoke generated by cutting or welding; the conveyor belt and roller shaft transmitted on the sliding air duct are used to drive the trolley shell to slide back and forth on the sliding air duct, which can remove the smoke generated at different cutting or welding positions, which is beneficial to improve the dust removal effect; the sealing plate is used to compensate for the gap between the trolley shell and the sliding air duct, thereby improving the sealing between the trolley shell and the sliding air duct, reducing the overflow of smoke and dust, improving the utilization rate of the air volume of the suction trolley, and improving the dust removal efficiency.

[0010] In one embodiment of the utility model, a connection port is provided on the sliding air duct, and support baffles are provided on the sliding air duct on both sides of the connection port. Both sides of the conveyor belt are respectively placed on the two support baffles for conveyance to seal the connection port.

[0011] In one embodiment of the utility model, an opening is provided on the housing of the trolley close to one side of the sliding air duct;

[0012] Rollers are arranged on both sides of the trolley housing, and the conveyor belt is wound around the rollers on both sides so that the opening is connected with the connecting port.

[0013] Through the above technical scheme, the two sides of the conveyor belt are mounted on the support baffles and slide to seal the connection port; the conveyor belt is wrapped around the roller to connect the opening with the connection port, so that the trolley shell and the sliding air duct are always connected when the trolley shell slides on the sliding air duct, thereby removing the smoke and dust generated at different cutting or welding positions, which is beneficial to improving the dust removal effect.

[0014] In one embodiment of the present invention, the air inlet is opened on the top of the vehicle shell.

[0015] The above technical solution makes it easy to remove the smoke generated by welding.

[0016] In one embodiment of the present invention, the width of the upper inner cavity of the trolley housing is greater than the width of the conveyor belt.

[0017] Through the above technical solution, the width of the upper inner cavity of the trolley shell is greater than the width of the conveyor belt, thereby forming a gap between the conveyor belt and the inner wall of the trolley shell, making it easier for smoke and dust to enter from the air intake port through the trolley shell and into the sliding air duct.

[0018] In an embodiment of the present invention, first partition baffles are fixed on both sides of the interior of the trolley housing.

[0019] Through the above technical solution, the first partition baffle shields the roller shaft to prevent smoke and dust from corroding the roller shaft and causing damage.

[0020] In one embodiment of the present invention, the air suction port is opened on the side wall of the trolley shell, and wing plates are arranged on the trolley shell on both sides of the air suction port.

[0021] Through the above technical solution, the air suction port opened on the side wall of the trolley shell is used to cooperate with the grille workbench to perform dust removal work; the wing plate makes the gap between the trolley shell and the grille workbench smaller, and during the air suction process, the air volume is more concentrated, thereby improving the dust removal efficiency.

[0022] In one embodiment of the present invention, an arched second partition baffle is disposed inside the vehicle housing.

[0023] Through the above technical solution, the second partition baffle shields the roller shaft to prevent smoke and dust from corroding the roller shaft and causing damage.

[0024] The utility model also discloses a welding fume removal workbench, comprising any of the above-mentioned suction trolleys, a first dust removal device connected to the sliding air duct, and a sliding support plate; the trolley housing is fixedly connected to the support plate;

[0025] A welding robot and a smoking nozzle located above the welding robot and connected to the air suction port are fixedly arranged on the supporting plate.

[0026] Through the above technical scheme, under the action of negative pressure, the first dust removal equipment can suck the smoke into the sliding air duct through the trolley shell, and then the smoke can be purified in the purification system through the purifier to discharge clean air; a welding robot is carried on the pallet, and the trolley shell and the pallet slide synchronously, thereby realizing linked smoke removal.

[0027] The utility model also discloses a cutting and dust removal workbench, comprising any of the above-mentioned suction trolleys, a grille workbench, a second dust removal device connected to the sliding air duct, a blowing trolley arranged opposite to the trolley housing, and a gantry-type cutting machine slidably connected to the grille plate; the trolley housing and the blowing trolley are both fixedly connected to the gantry-type cutting machine;

[0028] The air inlet and the wing plate are both attached to the side wall of the grille workbench;

[0029] The product to be cut is covered on the grid workbench and forms a plurality of flues with the grids. The blowing trolley blows toward the flues to make the smoke flow along the flues toward the suction trolley.

[0030] Through the above technical scheme, under the action of negative pressure, the second dust removal equipment can suck the smoke into the sliding air duct through the trolley shell, and then the smoke can be purified through the purifier in the purification system to discharge clean air; the blowing trolley, the trolley shell and the gantry cutting machine move together, so that the smoke can be removed in a linked manner, and the smoke generated at different cutting positions can be removed; the product to be cut (especially the plate) is covered on the grid workbench to form a number of flues between the grids, and the blowing trolley blows toward the several flues, which is conducive to the smoke flowing along the several flues toward the direction of the suction trolley, which is convenient for concentrating wind force and improving the dust removal effect.

[0031] As described above, the multi-purpose air suction trolley, welding fume removal workbench and cutting dust removal workbench of the utility model have the following beneficial effects:

[0032] 1. The trolley shell has two types of interfaces: side wall and top. Different interfaces can be selected according to actual conditions, with diverse functions;

[0033] 2. It can move along with the cutting machine or welding robot, so as to remove the smoke and dust generated at different cutting or welding positions, which is beneficial to improve the dust removal effect;

[0034] 3. Sealing sheets are fixed on both sides of the trolley shell. On the one hand, they make up for the gap between the trolley shell and the air duct. On the other hand, some sealing sheets are attached to the conveyor belt to increase the sealing performance, reduce the dust spillage, improve the utilization rate of the suction air volume, and improve the dust removal efficiency. Different specifications and models of sealing sheets can be selected according to the occasion and the amount of smoke and dust, covering a wide range.

[0035] 4. In the interface form in which the air suction port is arranged on the side wall of the trolley shell, wing plates are arranged on both sides of the air suction port. The wing plates make the gap between the trolley shell and the grille workbench smaller, and the air volume is more concentrated during the air suction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the trolley housing of Embodiment 1 of the present utility model;

[0037] Figure 2 It is a transverse cross-sectional view of the air suction trolley structure of Embodiment 1 of the present utility model;

[0038] Figure 3 It is a longitudinal sectional view of the air suction trolley structure of Embodiment 1 of the present utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the trolley housing of Embodiment 2 of the present utility model;

[0040] Figure 5 It is a transverse cross-sectional view of the air suction trolley structure of Embodiment 2 of the present utility model;

[0041] Figure 6 It is a longitudinal sectional view of the air suction trolley structure of Embodiment 2 of the present utility model;

[0042] Figure 7 It is a schematic diagram of the overall structure of Embodiment 3 of the present utility model;

[0043] Figure 8 yes Figure 7 The enlarged schematic diagram of part A in the middle;

[0044] Fig. 9 It is a schematic diagram of the overall structure of the fourth embodiment of the utility model from the left side;

[0045] Fig.10 yes Fig. 9 The enlarged schematic diagram of part B in the middle;

[0046] Fig.11 It is a schematic diagram of the overall structure of the fourth embodiment of the utility model on the right side;

[0047] Fig.12 yes Fig.11 Enlarged schematic diagram of part C in the middle.

[0048] Figure numerals: 1. sliding air duct; 2. trolley shell; 3. air suction port; 4. conveyor belt; 5. roller; 6. sealing plate; 7. connecting port; 8. supporting baffle; 10. first partition baffle; 12. support plate; 13. welding robot; 14. smoking nozzle; 15. wing plate; 16. second partition baffle; 17. second dust removal equipment; 18. blowing trolley; 19. grille workbench; 20. gantry cutting machine; 21. flue; 22. first connecting plate; 23. supporting frame; 24. connecting pipe; 25. clamp; 26. second connecting plate; 27. support rod. DETAILED DESCRIPTION

[0049] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0050] See also Figures 1 to 12It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0051] Example 1

[0052] See also Figures 1 to 3 The utility model provides a multi-purpose air suction trolley, comprising a sliding air duct 1 and a trolley housing 2 connected with the sliding air duct 1; an air suction port 3 is provided on the trolley housing 2;

[0053] The sliding air duct 1 is connected to a conveyor belt 4, and the trolley housing 2 is rotatably connected to a roller shaft 5. The conveyor belt 4 is wound around the roller shaft 5 and drives the trolley housing 2 to slide back and forth on the sliding air duct 1.

[0054] The trolley housing 2 is provided with a sealing sheet 6 attached to the conveyor belt 4 and the sliding air duct 1 to compensate for the gap between the trolley housing 2 and the sliding air duct 1. The sealing sheet 6 in this embodiment is a sealing rubber.

[0055] The sliding air duct 1 in this embodiment is a long strip box structure, and a connection port 7 of a rectangular structure is arranged at the top of the sliding air duct 1 along the length direction of the sliding air duct 1. Support baffles 8 are integrally formed on the sliding air duct 1 on both sides of the connection port 7. The two sides of the conveyor belt 4 are respectively mounted on the two support baffles 8 for transmission to achieve a sealed connection port 7; a plurality of support rods 27 are bolted or welded to the sliding air duct 1 perpendicular to the connection port 7; the support rods 27 and the support baffles 8 are used to support the conveyor belt 4 to be smoothly transmitted on the sliding air duct 1;

[0056] An opening is provided at the bottom of the trolley housing 2 near the sliding air duct 1 ; two rollers 5 are provided on both sides of the trolley housing 2 , and the conveyor belt 4 is wound around the two rollers 5 on both sides in an S shape so that the opening is connected to the connecting port 7 .

[0057] The air suction port 3 is opened at the top of the trolley shell 2, and the air suction port 3 is a circular structure; the trolley shell 2 in this embodiment is a box structure that is wide at the top and narrow at the bottom, and the width of the upper inner cavity of the trolley shell 2 is greater than the width of the conveyor belt 4, thereby forming a gap between the conveyor belt 4 and the inner wall of the trolley shell 2, which is convenient for smoke and dust to enter from the air suction port 3 through the trolley shell 2 and enter the sliding air duct 1; the first partition baffles 10 are bolted or welded on both sides of the interior of the trolley shell 2, and a first isolation chamber is formed between the two first partition baffles 10 and the two inner side walls of the trolley shell 2, and the first isolation chamber is used to shield the roller shaft 5, isolate the roller shaft 5 from smoke and dust, and prevent smoke and dust from corroding the roller shaft 5 and causing damage.

[0058] Example 2

[0059] See also Figures 4 to 6 The air suction port 3 is opened on the top of the trolley housing 2 to facilitate the removal of fumes generated by welding;

[0060] Therefore, the utility model provides a welding fume removal workbench, comprising any of the above-mentioned suction trolleys, a first dust removal device (not marked in the figure) connected to the sliding air duct 1, and a sliding support plate 12; the trolley housing 2 is fixedly connected to the support plate 12;

[0061] The support plate 12 slides back and forth on the slide rail, wherein the slide rail is arranged in parallel with the sliding air duct 1, wherein the support plate 12 can be driven to slide back and forth on the slide rail by a linear drive mechanism, and the linear drive mechanism can be a screw stepping motor, a synchronous belt mechanism, etc., and first connecting plates 22 are bolted to both sides of the trolley shell 2, and the two first connecting plates 22 are bolted and fixedly connected to the support plate 12, so that the trolley shell 2 and the support plate 12 can slide synchronously to remove the smoke generated at different cutting or welding positions; a through hole is opened on the side wall on the wide side of the sliding air duct 1, and a first suction duct connected to the other end of the through hole is connected to the first dust removal device. Under the action of negative pressure, the first dust removal device can suck the smoke into the sliding air duct 1 through the trolley shell 2, and then the smoke can be purified in the purification system through the purifier to discharge clean air;

[0062] The welding robot 13 and the support frame 23 are bolted to the support plate 12, and the smoking nozzle 14 is bolted to the support frame 23 located above the welding robot 13. The smoking nozzle 14 is connected to the trolley shell 2 through a connecting pipe 24. One end of the connecting pipe 24 is connected to the air suction port 3 on the top of the trolley shell 2, and the other end is connected to the smoking nozzle 14. The connecting pipe 24 is fixed to the support frame 23 through a clamp 25.

[0063] Example 3

[0064] See also Figure 7 and Figure 8The air inlet 3 is provided on the side wall of the trolley housing 2. The air inlet 3 is a rectangular structure. The trolley housing 2 in this embodiment is a rectangular box. Wing plates 15 are integrally formed on the trolley housing 2 on both sides of the air inlet 3.

[0065] A second arched partition baffle 16 is bolted or welded inside the trolley shell 2. Since the air intake port 3 is opened on the side wall of the trolley shell 2, the second partition baffle 16 and the inner wall of the trolley shell 2 form a second isolation cavity with an arched structure. The second isolation cavity is used to shield the roller shaft 5, isolate the roller shaft 5 from smoke and dust, and prevent the roller shaft 5 from being corroded by smoke and dust and causing damage.

[0066] Brief description of the use process: the trolley shell 2 moves back and forth on the sliding air duct 1 following the movement of the support plate 12. When the welding robot 13 is welding, under the action of negative pressure, the first dust removal device can suck the smoke into the trolley shell 2 and the sliding air duct 1 through the suction nozzle 14, and then the purifier can purify the smoke in the purification system to discharge clean air.

[0067] Example 4

[0068] See also Figures 9 to 12 The air suction port 3 is provided on the side wall of the trolley housing 2, and the air suction trolley is convenient for removing the smoke and dust generated by cutting;

[0069] Therefore, the utility model provides a cutting and dust removal workbench, including any of the above-mentioned suction trolleys, a grille workbench 19, a second dust removal device 17 connected to the sliding air duct 1, a blowing trolley 18 arranged opposite to the trolley housing 2, and a gantry-type cutting machine 20 slidably connected to the grille plate; the trolley housing 2 and the blowing trolley 18 are both fixedly connected to the gantry-type cutting machine 20;

[0070] A through hole is provided on the side wall on the wide side of the sliding air duct 1, and the through hole is connected to a second suction duct whose other end is connected to the second dust removal device 17. Under the action of negative pressure, the second dust removal device 17 can suck the smoke into the sliding air duct 1 through the trolley shell 2, and then the smoke can be purified in the purification system through the purifier to discharge clean air.

[0071] The sliding air duct 1 is arranged parallel to the length direction of the grille workbench 19, wherein the grille is arranged perpendicular to the sliding air duct 1; the air suction trolley is located on one side of the grille workbench 19, and the air blowing trolley 18 is located on the other side of the grille workbench 19; a fan is arranged on the air blowing trolley 18, and air can be blown from the side of the grille workbench 19; one side of the air blowing trolley 18 is connected to a slideway arranged parallel to the sliding air duct 1; the air blowing trolley 18 is bolted to the gantry cutting machine 20; the second connecting plates 26 are bolted to the two sides of the trolley shell 2, and the second connecting plates 26 are bolted to the gantry cutting machine 20, and the gantry cutting machine 20 can be driven to slide back and forth on the grille workbench 19 by a linear drive mechanism, and the linear drive mechanism can be a screw stepping motor and a synchronous belt mechanism; so that the air blowing trolley 18 and the trolley shell 2 can move with the movement of the gantry cutting machine 20, so as to realize the linkage removal of smoke and dust;

[0072] The air suction port 3 and the wing plate 15 are both attached to the side wall of the grille workbench 19; the wing plate 15 makes the gap between the trolley housing 2 and the grille workbench 19 smaller, and the air volume is more concentrated during the air suction process, thereby improving the dust removal efficiency;

[0073] The product to be cut is placed on the grid workbench 19 and a plurality of flues 21 are formed between the grids. The blowing trolley 18 blows air toward the flues 21 so that the smoke flows along the flues 21 toward the suction trolley.

[0074] The product to be cut (especially the upper plate) is covered on the grid workbench 19, and a large amount of smoke is generated during cutting. Due to the covering of the steel plate, the grid below the cutting position forms a channel for the smoke to flow. The power of the blowing fan is turned on, and air is blown through the blowing port towards the channel formed by the grid, which is conducive to the smoke flowing along the channel toward the suction trolley; it is convenient to concentrate the wind force and improve the dust removal effect.

[0075] Brief description of the use process: the trolley shell 2 and the blowing trolley 18 move back and forth on the sliding air duct 1 and the slideway following the movement of the gantry cutting machine 20. When the gantry cutting machine 20 is cutting, the fan on the blowing trolley 18 blows toward one side of the suction trolley, and the smoke flows along a plurality of smoke ducts 21 toward the direction of the suction trolley. Under the action of negative pressure, the second dust removal device 17 can suck the smoke into the sliding air duct 1 through the trolley shell 2, and then the smoke can be purified in the purification system through the purifier to discharge clean air.

[0076] In summary, the trolley housing 2 in the utility model has two interface forms, the side wall and the top, and different interfaces can be selected according to actual conditions, with various functions; it can move with the movement of the cutting machine or welding robot 13, thereby removing smoke and dust generated at different cutting or welding positions, which is conducive to improving the dust removal effect. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0077] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A multi-purpose air suction trolley, characterized in that: The invention comprises a sliding air duct (1) and a trolley housing (2) connected to the sliding air duct (1); an air suction port (3) is provided on the trolley housing (2). The sliding air duct (1) is connected to a conveyor belt (4) in a transmission manner, and the trolley housing (2) is rotatably connected to a roller shaft (5), and the conveyor belt (4) is wound around the roller shaft (5) and drives the trolley housing (2) to slide back and forth on the sliding air duct (1); The trolley housing (2) is provided with a sealing sheet (6) which is attached to the conveyor belt (4) and the sliding air duct (1) to compensate for the gap between the trolley housing (2) and the sliding air duct (1).

2. A multi-purpose air suction vehicle according to claim 1, characterized in that: The sliding air duct (1) is provided with a connection port (7), and support baffles (8) are provided on the sliding air duct (1) located on both sides of the connection port (7), and the two sides of the conveyor belt (4) are respectively laid on the two support baffles (8) for conveyance to seal the connection port (7).

3. A multi-purpose air suction vehicle according to claim 2, characterized in that: An opening is provided on the trolley housing (2) on one side close to the sliding air duct (1); Roller shafts (5) are provided on both sides of the trolley housing (2), and the conveyor belt (4) is wound around the roller shafts (5) on both sides so that the openings are connected to the connection ports (7).

4. A multi-purpose suction vehicle according to any one of claims 1 to 3, characterized in that: The air suction port (3) is provided on the top of the trolley housing (2).

5. The multi-purpose air suction vehicle according to claim 4, characterized in that: The width of the upper inner cavity of the trolley housing (2) is greater than the width of the conveyor belt (4).

6. The multi-purpose air suction vehicle according to claim 5, characterized in that: First partition baffles (10) are fixed on both sides of the interior of the trolley housing (2).

7. A multi-purpose air suction vehicle according to any one of claims 1 to 3, characterized in that: The air suction port (3) is opened on the side wall of the trolley shell (2), and wing plates (15) are arranged on the trolley shell (2) on both sides of the air suction port (3).

8. The multi-purpose air suction vehicle according to claim 7, characterized in that: An arched second partition baffle (16) is arranged inside the trolley housing (2).

9. A welding fume removal workbench, characterized in that: It comprises a suction trolley as claimed in any one of claims 4 to 6, a first dust removal device connected to the sliding air duct (1), and a sliding support plate (12); the trolley housing (2) is fixedly connected to the support plate (12); A welding robot (13) and a smoking nozzle (14) located above the welding robot (13) and connected to the air suction port (3) are fixedly arranged on the support plate (12).

10. A cutting and dust removal workbench, characterized in that: It comprises a suction trolley as claimed in any one of claims 7 and 8, a grille workbench (19), a second dust removal device (17) connected to the sliding air duct (1), a blowing trolley (18) arranged opposite to the trolley housing (2), and a gantry-type cutting machine (20) slidably connected to the grille plate; the trolley housing (2) and the blowing trolley (18) are both fixedly connected to the gantry-type cutting machine (20); The air inlet (3) and the wing plate (15) are both attached to the side wall of the grille workbench (19); The product to be cut is covered on the grid workbench (19) and forms a plurality of flues (21) with the grids. The blowing trolley (18) blows air toward the flues (21) so that the smoke flows along the flues (21) toward the suction trolley.

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