A pneumatic rotary arm fume hood

Abstract

The application discloses a kind of pneumatic rotary arm smoke collecting cover, belong to smoke collecting cover technical field.It include stand, cantilever unit, first pneumatic swing component and smoke collecting unit, the cantilever unit includes fixed in stand top, and the rotary seat of C-shaped structure is presented;The bearing body is fixed to the rotary seat upside and downside side;The cantilever body is rotatably arranged between the bearing body by rotating shaft;The pipeline support is fixed in the rotary seat outer side top;The rotary seat side is fixed with the limiting block that cantilever body is attached;The first pneumatic swing component is fixed to the outside of rotary seat, and the swing end of the first pneumatic swing component is hingedly installed with cantilever body;The first pneumatic swing component is connected with control switch by controller, and the control switch is fixed to stand;The pneumatic rotary arm smoke collecting cover of the application, cover body can be suspended or rotated by pressure difference, while being able to realize the comprehensive collection or fixed-point collection to local low side smoke.

Description

Technical Field

[0001] This invention specifically relates to a pneumatic rotating arm smoke hood, belonging to the field of smoke hood technology. Background Technology

[0002] In industrial dust control systems, fume hoods are key source collection devices that determine treatment efficiency and energy consumption. Their main function is to efficiently capture pollutants near their point of origin and introduce them into the purification system before they diffuse. For example, Chinese Patent Publication No. CN223571608U discloses a dust collection hood that includes a hood body and a translation adjustment mechanism. The bottom of the hood body has a smoke outlet, and the top of the hood body has a connecting pipe that communicates with the smoke outlet. This structure provides users with a medium to translate and adjust the smoke collection range of the hood body according to actual smoke collection needs, avoiding difficulties in adjusting the smoke collection range during use. Furthermore, existing fume hoods used in fixed workstations requiring precise operations generally employ purely manual universal arms, relying on friction between joints for positioning. This results in inherent defects such as cumbersome operation and wear and tear on friction components after long-term use, leading to arm tube loosening and sagging (i.e., "nodding"), which affects collection efficiency and stability. When smoke is first generated or in the later stages of collection, and when the smoke is at its lowest point, the large area of ​​the hood draws in smoke results in limited suction power for the low-lying smoke, making it impossible to ensure complete collection. Moreover, the hood draws air from a large surrounding smoke-free area, resulting in wasted suction power. In addition, existing hoods cannot achieve targeted smoke collection for a specific process within the workstation. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a pneumatic rotating arm smoke collection hood. The hood can hover or rotate using air pressure differences, and can simultaneously collect smoke odors from local low-lying areas comprehensively or at specific points.

[0004] The pneumatic rotating arm smoke hood of the present invention includes:

[0005] Columns;

[0006] A cantilever unit includes a C-shaped rotating seat fixed to the top of a column; bearing bodies are fixed to the upper and lower sides of the rotating seat; a cantilever body is rotatably mounted between the bearing bodies via a rotating shaft; a pipe support is fixed to the top outer side of the rotating seat; and a limiting block that fits against the cantilever body is fixed to the side of the rotating seat.

[0007] The first pneumatic swing assembly is fixed to the outside of the rotating base, and the swing end of the first pneumatic swing assembly is hinged to the cantilever body; the first pneumatic swing assembly is connected to a control switch via a controller, and the control switch is fixed to the column.

[0008] The smoke collection unit includes a square hood with a smoke collection pipe fixed at the center of the hood. The smoke collection pipe is connected to the bag filter dust collector via a flexible hose.

[0009] During operation, a clockwise or counterclockwise rotation signal is sent via a control switch. Upon receiving the signal, the controller sends a signal to the solenoid valve corresponding to the first pneumatic swing assembly, causing the first pneumatic swing assembly to swing clockwise or counterclockwise. The first pneumatic swing assembly synchronously drives the cantilever body to rotate and swing along the rotating seat, and the swing range of the cantilever body can be limited by the limit block. When the swing arm swings, it drives the hood to swing synchronously. After swinging directly above the flue gas source, the first pneumatic swing assembly locks the position of the swing arm body. Then, the smoke collection process is carried out, and the filter bag dust collector provides suction to the smoke collection pipe and the hood through the hose.

[0010] Furthermore, a smoke sensing unit is fixed to the front end of the hood, and the smoke sensing unit is connected to the controller; the controller controls the first pneumatic swing assembly to reciprocate and rotate, and can actively capture the intensity of the surrounding smoke through the smoke sensing unit. When the smoke intensity reaches the highest point, the position of the hood is locked, and the hood performs smoke collection work; the smoke sensing unit can use laser and infrared detection methods, such as using a laser gas telemetry instrument or an infrared smoke detector, or detect the temperature of the processing area of ​​the workstation, and indirectly determine the location of smoke generation by capturing the temperature.

[0011] Furthermore, a smoke guide hood is fixed to the top inner side of the hood via a flange, and the bottom of the smoke collection pipe is fitted and fixed to the bottom of the smoke guide hood; smoke guide plates are rotatably arranged on both sides of the hood; two outer fixing plates are fixed to the bottom inner side of the hood directly below the smoke guide hood, and two sets of louvers are rotatably arranged to the bottom inner side of the hood outside the outer fixing plates; the louvers are connected via an opening and closing actuator; multiple inner fixing plates are fixed between the two outer fixing plates; the smoke guide plates are movably fitted with the outer fixing plates; two sets of second pneumatic swing assemblies are fixed to the top outer side of the hood on both sides of the smoke collection pipe, and the swing ends of the two second pneumatic swing assemblies are hinged to the outside of the smoke guide plates.

[0012] The smoke guide hood can linearly concentrate suction power or expand the collection area, as detailed below:

[0013] When the collection surface is expanded to enable the hood to collect flue gas completely, the swing end of the second pneumatic swing assembly drives the smoke guide plate to move towards the top of the inner side of the hood; at this time, the flue gas can enter the smoke guide hood from the gap between the louvers, the gap between the louvers and the outer fixed plate, the gap between the outer fixed plate and the inner fixed plate, and the gap between the inner fixed plate, and then be sent into the smoke collection pipe through the smoke guide hood.

[0014] When linear centralized collection of flue gas is performed, the opening and closing driver drives the louvers to swing, causing adjacent louvers to fit together. At this time, the louvers close the space outside the outer fixed plate. Then, the second pneumatic swing assembly is activated, driving the smoke guide plate to rotate and swing along the hood. At this time, the smoke guide plate presses against the outside of the outer fixed plate, thus forming an independent internal smoke collection channel inside the hood through the smoke guide hood, smoke guide plate, and outer fixed plate. With the filter bag dust collector maintaining a constant suction force, it can ensure that the smoke collection channel has sufficient suction force for the low-level flue gas.

[0015] Furthermore, the first pneumatic swing assembly and the second pneumatic swing assembly include an outer cylinder seat; the outer cylinder seat is provided with a swing groove; a cylinder is fixed inside the outer cylinder seat, and the cylinder's pipeline is hung on a pipeline support; the front end of the outer cylinder seat is hinged to the middle of a Y-shaped rocker arm; one end of the rocker arm is hinged to the piston rod of the cylinder, the other end of the rocker arm is hinged to one end of a connecting plate, and the other end of the connecting plate is hinged to a cantilever body or a smoke guide plate.

[0016] When the first and second pneumatic swing components are in operation, they are externally enclosed by the outer cylinder seat. The outer cylinder seat has a swing space for the rocker arm and the connecting plate. At the same time, the connecting plate can protrude from the outer cylinder seat through the swing groove. The top of the cover is provided with a slide rail facing the swing groove. When in operation, the cylinder is activated, which drives one end of the rocker arm to move. The middle part of the rocker arm swings on the outer cylinder seat, and the other end of the rocker arm drives the connecting plate to swing. Thus, the cylinder can drive the connecting plate to rotate and swing, realizing the rotation and swing of the cantilever body or the smoke guide plate.

[0017] Furthermore, the opening and closing actuator includes a transmission component and a drive component. The transmission component includes a connecting block fixed to the top side of the louver, and a first linkage plate is hinged between adjacent connecting blocks. One of the two sets of louvers is fixed with a first linkage seat, and a second linkage seat is fixed to the outside of the smoke guide plate. The drive component is a second linkage plate hinged between the first linkage seat and the second linkage seat.

[0018] When high linearity smoke collection is required, the second pneumatic swing assembly drives the smoke guide plate to fit against the outer fixed plate, thereby forming a smoke collection channel at the center of the hood, the spring tube, and the nozzle. When the smoke guide plate swings, it drives a certain louver to swing through the second linkage seat, the second linkage plate, and the second linkage seat. When a certain louver swings, it is linked with the connecting block and the first linkage plate to realize that all other louvers swing synchronously and achieve mutual contact between the louvers. When the smoke guide plate returns to its original position, it disengages from the outer fixed plate. At the same time, the second linkage plate and the first linkage plate synchronously drive all the louvers to swing synchronously, making the louvers perpendicular to the ground.

[0019] Furthermore, the transmission assembly includes a sprocket disposed outside the hood and fixed to the rotating end of the smoke guide plate, with a chain sleeved around the sprocket; the drive assembly is an on / off motor fixed to one of the sprockets; the on / off motor can drive one sprocket to rotate, and through the cooperation of the sprocket and the chain, the louvers can be made to fit together to seal the bottom of the hood, and can also drive the louvers to be perpendicular to the ground to ensure that the hood can collect smoke smoothly. In addition, the on / off motor can adjust the tilt angle of the louvers to adjust the angle of smoke collection.

[0020] Furthermore, two sets of guide plates are hinged to the bottom inner side of the smoke hood, and a figure-eight shaped transmission belt is sleeved on the outside of the smoke hood for the two sets of guide plates; the rotating end of one of the guide plates is fixed to a guide motor; the guide motor can drive one guide plate to rotate and swing, and drive the two guide plates to move synchronously through the transmission belt, so that the guide plates move perpendicular to the ground, closer to each other, or further away from each other; the guide plates can adjust the suction direction of the smoke hood, and when fixed-point smoke collection and area smoke collection are carried out simultaneously, while ensuring that the center of the hood has suction, the suction is distributed to other positions of the hood by adjusting the guide plates, so that the area smoke collection of the hood can also have suction when collecting smoke at fixed points.

[0021] Furthermore, the lower part of the outer fixing plate has a slot on one side close to the other; the front end of the cover has a slot; the slot has rails on both sides, and elastic plates are movably engaged on the rails; a fixed-point smoking component is engaged at the slot, the fixed-point smoking component includes a spring tube, and a mouthpiece is fixed at the bottom of the spring tube; a frame is fixed at the top of the spring tube, and the top two sides of the frame are integrally formed with retaining edges; the retaining edges are movably engaged with the slot.

[0022] When in use, it can achieve high-suction, targeted smoke collection as needed, as well as smoke collection in localized areas or at fixed points within a workstation; details are as follows:

[0023] During fixed-point smoke collection, the smoke guide plate and the outer fixed plate are first movably fitted together to form a guide zone. Then, the retaining edge of the frame seat is fitted into the retaining groove and secured by the elastic retaining plate. At this time, the guide zone, frame seat, spring tube, and suction nozzle form a smoke collection duct. By swinging and adjusting the spring tube, the suction nozzle is positioned at a 30°~60° angle directly facing a certain smoke generation point at the workstation. At this time, the filter bag dust collector provides smoke collection suction. Since the smoke collection duct greatly reduces the smoke collection area relative to the hood, the suction power for fixed-point smoke collection is guaranteed.

[0024] When collecting smoke in localized areas or at fixed points within a workstation, the smoke guide plate is separated from the outer fixed plate, enabling the entire hood to collect smoke. At this point, the center of the hood, the spring tube, and the suction nozzle form a smoke collection duct. By swinging and adjusting the spring tube, the suction nozzle is positioned directly above a specific point where smoke is generated at the workstation. The filter bag dust collector provides suction to achieve fixed-point smoke collection. Simultaneously, other areas of the hood also possess smoke collection capabilities. Dust not completely collected at the fixed point, or smoke generated at other points, can be absorbed by the higher-level hood, thus achieving both fixed-point and localized smoke collection.

[0025] Furthermore, the cantilever body has a Y-shaped structure, which can be used to attach and support the cover, and can cooperate with the rotating seat to achieve hovering or rotation.

[0026] Compared with existing technologies, the pneumatic rotating arm fume hood of the present invention uses the first pneumatic swing component to achieve the suspension or rotation of the cantilever body by relying on air pressure difference, which can ensure that the hood accurately travels to the dust collection area; thus, it can achieve efficient fume collection in the work area; when the flue gas is at a low level, an independent fume collection area is formed by the fume guide hood and the fume guide plate, and the remaining fume collection surface of the hood is blocked by two sets of louvers, which can greatly reduce the fume collection area of ​​the fume hood on the horizontal plane. The suction provided by the filter bag dust collector is all applied to the independent fume collection area, improving the linearity of the suction force, and can achieve comprehensive collection of flue gas at a low level. According to the process requirements, spring tubes and suction nozzles can be set in the independent fume collection area. Through the extensibility and universal memory of the spring tubes, point-to-point fume collection for a certain process can be achieved; in addition, the independent fume collection area can be deactivated while keeping the spring tubes and the hood installed to achieve fixed-point fume collection and work area fume collection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the pneumatic rotating arm smoke hood of the present invention.

[0028] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the pneumatic rotating arm smoke hood of the present invention.

[0029] Figure 3 This is a schematic diagram of the arrangement of the internal components of the cover of the present invention.

[0030] Figure 4 This is a schematic diagram of the cover and the installation structure of the internal components of the cover in Embodiment 3 of the present invention.

[0031] Figure 5 This is a schematic diagram of the installation structure of the cover and its internal components in Embodiment 4 of the present invention.

[0032] Figure 6 This is a schematic diagram of the overall structure of the cover in Embodiment 4 of the present invention.

[0033] Figure 7 This is a schematic diagram of the connection structure between the smoke hood and the guide plate in Embodiment 5 of the present invention.

[0034] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0035] Figure 9 This is a schematic diagram of the installation structure of the cover and its internal components in Embodiment 6 of the present invention.

[0036] Figure 10 This is a schematic diagram of the mounting structure of the frame, retaining edge, spring tube, and suction nozzle of the present invention.

[0037] Figure 11 This is a schematic diagram of the overall structure of the cover in Embodiment 6 of the present invention.

[0038] Figure 12 For the present invention Figure 11 A magnified schematic diagram of the structure at point B in the middle.

[0039] Reference numerals: 1. Column, 2. Rotating seat, 3. Cantilever body, 4. Pipe support, 5. Limiting block, 6. Control switch, 7. Cover, 8. Smoke collection pipe, 9. Smoke sensing unit, 10. Smoke guide hood, 11. Smoke guide plate, 12. Outer fixing plate, 13. Louvered plate, 14. Inner fixing plate, 15. Second pneumatic swing assembly, 16. Cylinder, 17. Rocker arm, 18. Connecting plate, 19. Connecting block, 20. First linkage plate, 21. First linkage seat, 22. Second linkage seat, 23. Outer cylinder seat, 24. Chain, 25. Guide plate, 26. Transmission belt, 27. Slot, 28. Rail, 29. Elastic plate, 30. Nozzle, 31. Frame seat, 32. Edge, 33. Spring tube. Detailed Implementation

[0040] Example 1:

[0041] like Figure 1 The pneumatic rotating arm smoke hood shown includes:

[0042] Column 1;

[0043] The cantilever unit includes a C-shaped rotating seat 2 fixed to the top of the column 1; bearing bodies are fixed to the upper and lower sides of the rotating seat 2; a cantilever body 3 is rotatably arranged between the bearing bodies via a rotating shaft; a pipe support 4 is fixed to the top outer side of the rotating seat 2; and a limiting block 5 that fits against the cantilever body 3 is fixed to the side of the rotating seat 2.

[0044] The first pneumatic swing assembly is fixed to the outside of the rotating base 2, and the swing end of the first pneumatic swing assembly is hinged to the cantilever body 3; the first pneumatic swing assembly is connected to the control switch 6 through the controller, and the control switch 6 is fixed on the column 1;

[0045] The smoke collection unit includes a square hood 7, with a smoke collection pipe 8 fixed at the center of the hood 7. The smoke collection pipe 8 is connected to the filter bag dust collector via a flexible hose.

[0046] During operation, a clockwise or counterclockwise rotation signal is sent through the control switch 6. After receiving the signal, the controller sends a signal to the solenoid valve corresponding to the first pneumatic swing component, so that the first pneumatic swing component swings clockwise or counterclockwise. The first pneumatic swing component synchronously drives the cantilever body 3 to rotate and swing along the rotating seat 2, and the swing range of the cantilever body 3 can be limited by the limit block 5. When the swing arm swings, the drive hood 7 swings synchronously. After swinging directly above the flue gas source, the first pneumatic swing component locks the position of the swing arm. Then the smoke collection process is carried out. The filter bag dust collector provides suction to the smoke collection pipe 8 and the hood 7 through the hose.

[0047] Example 2:

[0048] like Figure 2 The pneumatic rotating arm fume hood shown has a fume sensing unit 9 fixed at the front end of the hood body 7, which is connected to a controller. The controller controls the reciprocating rotation of the first pneumatic swing assembly and actively captures the intensity of the surrounding fume through the fume sensing unit 9. When the fume intensity reaches its highest point, the position of the hood body 7 is locked, and fume collection is performed through the hood body 7. The fume sensing unit 9 can detect fumes using laser and infrared methods, such as using a laser gas telemetry instrument or an infrared fume detector, or by detecting the temperature of the processing area of ​​the workstation, and indirectly determine the location of fume generation by capturing the temperature.

[0049] Example 3:

[0050] like Figure 3 and Figure 4The pneumatic rotating arm smoke hood shown has a smoke guide hood 10 fixed to the top inner side of the hood body 7 via a flange, and the bottom of the smoke collection pipe 8 is fitted and fixed to the bottom of the smoke guide hood 10; smoke guide plates 11 are rotatably arranged on both sides of the hood body 7; two outer fixing plates 12 are fixed to the bottom inner side of the hood body 7 directly below the smoke guide hood 10, and two sets of louvers 13 are rotatably arranged to the bottom inner side of the hood body 7 outside the outer fixing plates 12; the louvers 13 are connected by an opening and closing driver; multiple inner fixing plates 14 are fixed between the two outer fixing plates 12; the smoke guide plates 11 are movably fitted with the outer fixing plates 12; two sets of second pneumatic swing assemblies 15 are fixed to the top outer side of the hood body 7 on both sides of the smoke collection pipe 8, and the swing ends of the two second pneumatic swing assemblies 15 are hinged to the outside of the smoke guide plates 11.

[0051] The smoke guide hood 10 can linearly concentrate the suction or expand the collection surface, as detailed below:

[0052] When the collection surface is expanded to enable the hood 7 to collect the flue gas completely, the swing end of the second pneumatic swing assembly 15 drives the smoke guide plate 11 to move towards the top of the inner side of the hood 7; at this time, the flue gas can enter the smoke guide hood 10 from the gap between the louvers 13, the gap between the louvers 13 and the outer fixed plate 12, the gap between the outer fixed plate 12 and the inner fixed plate 14, and the gap between the inner fixed plate 14, and be sent into the smoke collection pipe 8 through the smoke guide hood 10;

[0053] When linear centralized collection of flue gas is performed, the opening and closing driver drives the louver 13 to swing, so that adjacent louvers 13 are in contact with each other. At this time, the louver 13 closes the space outside the outer fixed plate 12. Then, the second pneumatic swing assembly 15 is activated, and the second pneumatic swing assembly 15 drives the smoke guide plate 11 to rotate and swing along the hood 7. At this time, the smoke guide plate 11 and the outer fixed plate 12 are pressed together, so that an independent internal smoke collection channel is formed inside the hood 7 through the smoke guide hood 10, the smoke guide plate 11 and the outer fixed plate 12. Under the condition that the filter bag dust collector maintains a constant suction, it can ensure that the smoke collection channel has sufficient suction for the low-level flue gas.

[0054] The first pneumatic swing assembly and the second pneumatic swing assembly 15 include an outer cylinder seat 23; the outer cylinder seat 23 is provided with a swing groove; a cylinder 16 is fixed inside the outer cylinder seat 23, and the pipeline of the cylinder 16 is hung on the pipeline support 4; the front end of the outer cylinder seat 23 is hinged to the middle of the Y-shaped rocker arm 17; one end of the rocker arm 17 is hinged to the piston rod of the cylinder 16, and the other end of the rocker arm 17 is hinged to one end of the connecting plate 18, and the other end of the connecting plate 18 is hinged to the cantilever body 3 or the smoke guide plate 11.

[0055] When the first pneumatic swing assembly and the second pneumatic swing assembly 15 are working, they are externally enclosed by the outer cylinder seat 23. The outer cylinder seat 23 has a swing space for the rocker arm 17 and the connecting plate 18. At the same time, the connecting plate 18 can protrude from the outer cylinder seat 23 through the swing groove. The top of the cover 7 is provided with a slide rail facing the swing groove. When working, the cylinder 16 is activated, and the cylinder 16 drives one end of the rocker arm 17 to move. The middle part of the rocker arm 17 swings on the outer cylinder seat 23, and the other end of the rocker arm 17 drives the connecting plate 18 to swing. Thus, the cylinder 16 can drive the connecting plate 18 to rotate and swing, so as to realize the rotation and swing of the cantilever body 3 or the smoke guide plate 11.

[0056] The opening and closing actuator includes a transmission component and a drive component. The transmission component includes a connecting block 19 fixed to the top side of the louver 13, and a first linkage plate 20 is hinged between adjacent connecting blocks 19. One of the two sets of louvers 13 is fixed with a first linkage seat 21, and a second linkage seat 22 is fixed to the outside of the smoke guide plate 11. The drive component is a second linkage plate hinged between the first linkage seat 21 and the second linkage seat 22.

[0057] When high linearity smoke collection is required, the second pneumatic swing assembly 15 drives the smoke guide plate 11 to fit against the outer fixed plate 12, thereby forming a smoke collection channel with the center position of the hood 7, the spring tube, and the nozzle. When the smoke guide plate 11 swings, it drives a certain louver 13 to swing through the second linkage seat 22, the second linkage plate, and the second linkage seat 22. When a certain louver 13 swings, it is linked through the connecting block 19 and the first linkage plate 20 to realize that all other louver 13 swing synchronously and achieve mutual contact between the louver 13. When the smoke guide plate 11 returns to its original position, the smoke guide plate 11 disengages from the outer fixed plate 12. At the same time, the second linkage plate and the first linkage plate synchronously drive all the louver 13 to swing synchronously, so that the louver 13 is perpendicular to the ground.

[0058] Example 4:

[0059] like Figure 5 and Figure 6 The pneumatic rotating arm smoke hood shown includes a transmission assembly comprising a sprocket fixed to the rotating end of the smoke guide plate 11 and disposed outside the hood body 7, with a chain 24 sleeved on the outside of the sprocket; the drive assembly is an opening and closing motor fixed to one of the sprockets; the opening and closing motor can drive one sprocket to rotate, and through the cooperation of the sprocket and the chain 24, the louvers 13 can be made to fit together to close the bottom of the hood body 7, and can also drive the louvers 13 to be perpendicular to the ground to ensure that the hood body 7 can collect smoke smoothly. In addition, the opening and closing motor can adjust the tilt angle of the louvers 13 to adjust the angle of smoke collection.

[0060] Example 5:

[0061] like Figures 7 to 8The pneumatic rotating arm smoke hood shown has two sets of guide plates 25 hinged to the bottom inner side of the smoke hood 10. A figure-eight shaped transmission belt 26 is sleeved around the two sets of guide plates 25 on the outside of the smoke hood 10. The rotating end of one guide plate 25 is fixed to a guide motor. The guide motor can drive one guide plate 25 to rotate and swing, and drive the two guide plates 25 to move synchronously through the transmission belt 26, making the guide plates 25 perpendicular to the ground, moving closer to each other, or moving further away from each other. The guide plates 25 can adjust the suction direction of the smoke hood 10. When fixed-point smoke collection and area smoke collection are performed simultaneously, while ensuring suction at the center of the hood 7, the suction is distributed to other positions of the hood 7 by adjusting the guide plates 25, ensuring that area smoke collection of the hood 7 has suction during fixed-point smoke collection.

[0062] Example 6:

[0063] like Figures 9 to 12 The pneumatic rotating arm smoke hood shown has a slot 27 on the lower side of the outer fixing plate 12 that is close to each other; a slot is provided at the front end of the hood body 7; a rail 28 is provided on both sides of the slot, and an elastic plate 29 is movably engaged on the rail 28; a fixed-point smoking component is engaged at the slot, the fixed-point smoking component includes a spring tube 33, a mouthpiece 30 is fixed at the bottom of the spring tube 33; a frame base 31 is fixed at the top of the spring tube 33, and the top two sides of the frame base 31 are integrally formed with retaining edges 32; the retaining edges 32 are movably engaged with the slot 27.

[0064] When in use, it can achieve high-suction, targeted smoke collection as needed, as well as smoke collection in localized areas or at fixed points within a workstation; details are as follows:

[0065] When collecting smoke at a fixed point, firstly, the smoke guide plate 11 and the outer fixed plate 12 are movably fitted together, so that the smoke guide plate 11 and the outer fixed plate 12 form a guide zone. Then, the retaining edge 32 of the frame seat 31 is fitted into the retaining groove 27 and secured by the elastic retaining plate 29. At this time, the guide zone, the frame seat 31, the spring tube 33 and the suction nozzle 30 form a smoke collection pipe. By swinging and adjusting the spring tube 33, the suction nozzle 30 is positioned at an angle of 30° to 60° and directly facing a certain smoke generation point at the workstation. At this time, the filter bag dust collector provides smoke collection suction. Since the smoke collection pipe greatly reduces the smoke collection area relative to the hood 7, the suction of fixed-point smoke collection is guaranteed.

[0066] When collecting smoke in localized areas or at fixed points in the work area, the smoke guide plate 11 is separated from the outer fixed plate 12, enabling the entire hood 7 to collect smoke. At this time, the center of the hood 7, the spring tube 33, and the suction nozzle 30 form a smoke collection pipe. By swinging and adjusting the spring tube 33, the suction nozzle 30 is positioned directly opposite a smoke generation point in the work area. The filter bag dust collector provides suction to collect smoke, achieving suction for fixed-point smoke collection. At the same time, other positions of the hood 7 also have smoke collection capabilities. Dust that is not completely collected at the fixed point, or smoke generated at other points, can be absorbed by the higher-level hood 7, thus achieving both fixed-point and localized smoke collection.

[0067] The cantilever 3 has a Y-shaped structure. The cantilever 3 can be attached to and supported by the cover 7, and can cooperate with the rotating seat 2 to achieve hovering or rotation.

[0068] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A gas powered rotary arm hood, characterized by: Include: The column, The cantilever unit includes a rotating seat fixed to the top of the column and a C-shaped structure; the upper and lower sides of the rotating seat are opposite and fixed with bearing bodies; the bearing bodies are rotatably provided with a cantilever body through a rotating shaft; the outer top of the rotating seat is fixed with a pipeline support; the side of the rotating seat is fixed with a limiting block matched with the cantilever body; The first pneumatic swing assembly is fixed outside the rotating seat, the swing end of the first pneumatic swing assembly is hingedly installed with the cantilever body; the first pneumatic swing assembly is connected with the control switch through the controller, and the control switch is fixed on the column; The smoke collecting unit includes a square cover body, a smoke collecting pipe is fixed at the center of the cover body, and the smoke collecting pipe is connected to the filter bag dust collector through a hose; The inner top of the cover body is fixed with a smoke guide cover through a flange, the bottom of the smoke collecting pipe is embedded and fixed with the bottom of the smoke guide cover, two smoke guide plates are rotatably arranged on both sides of the cover body, two outer fixed plates are fixed below the smoke guide cover inside the cover body, two groups of louver plates are rotatably arranged outside the outer fixed plates inside the cover body bottom, the louver plates are connected through the opening and closing drive, a plurality of inner fixed plates are fixed between the two outer fixed plates; the smoke guide plate and the outer fixed plate are movably matched; two groups of second pneumatic swing assemblies are fixed on both sides of the smoke collecting pipe on the outer top of the cover body, the swing ends of the two second pneumatic swing assemblies are hingedly installed with the outside of the smoke guide plate; The opening and closing drive includes a transmission assembly and a driving assembly, the transmission assembly includes a connecting block fixed to the top side of the louver plate, a first linkage plate is hingedly connected between adjacent connecting blocks; one of the two groups of louver plates is fixed with a first linkage seat, the outside of the smoke guide plate is fixed with a second linkage seat, and the driving assembly is a second linkage plate hingedly connected between the first linkage seat and the second linkage seat.

2. The air-driven rotary-arm fume hood of claim 1, wherein: The front end of the cover body is fixed with a smoke gas sensing unit, and the smoke gas sensing unit is connected to the controller.

3. The air-driven rotary-arm fume hood of claim 1, wherein: The first pneumatic swing assembly and the second pneumatic swing assembly include an outer cylinder seat; a swing sliding groove is formed in the outer cylinder seat; a cylinder is fixed inside the outer cylinder seat, and the pipeline of the cylinder is hung on the pipeline support; the front end of the outer cylinder seat is hingedly connected with the middle part of the Y-shaped rocker; one end of the rocker is hingedly connected with the piston rod of the cylinder, the other end of the rocker is hingedly connected to one end of the connecting plate, and the other end of the connecting plate is hingedly connected with the cantilever body or the smoke guide plate.

4. The air-driven rotary-arm fume hood of claim 1, wherein: The bottom of the smoke guide cover is hingedly connected with two groups of guide plates, and the outside of the smoke guide cover is sleeved with an 8-shaped transmission belt; the rotating end of one of the guide plates is fixed with a guide motor.

5. The air-driven rotary-arm fume hood of claim 1, wherein: The lower part of the outer fixed plate is provided with a clamping groove on one side close to each other; a clamping hole is formed at the front end of the cover body; clamping rails are arranged on both sides of the clamping hole, and elastic clamping plates are movably clamped on the clamping rails; a fixed point smoke suction assembly is clamped at the clamping hole, the fixed point smoke suction assembly includes a spring pipe, and a suction nozzle is fixed at the bottom of the spring pipe; a frame seat is fixed at the top of the spring pipe, and clamping edges are integrally formed on both sides of the top of the frame seat; the clamping edges are movably clamped with the clamping grooves.

6. The air-driven rotary-arm fume hood of claim 1, wherein: The cantilever body is Y-shaped structure.

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