CN213826331U - Electrolytic aluminum hot anode scrap cooling pollutant collecting device - Google Patents

Abstract

The utility model provides a hot anode scrap cooling pollutant collection device of electrolysis aluminium, which comprises a tray, the cover body of discharging fume, exhaust mechanism and rotary driving mechanism, exhaust mechanism connects and is used for concentrating the internal gas of discharge fume cover to discharge fume cover body one side, rotary driving mechanism is used for driving the cover body of discharging fume and rotates, the tray is used for placing the anode scrap charcoal piece, the bottom of the cover body of discharging fume sets up to uncovered structure and is identical with the tray, the top of the cover body of discharging fume and the one side of keeping away from rotary driving mechanism have seted up the notch, the notch is used for the rod iron at anode scrap charcoal top to pass, the both sides of notch are provided with first floating gate and second floating gate respectively. The utility model discloses can improve the steady smoothness degree of the cover body function process, improve the leakproofness of the cover body simultaneously to solve the not enough reasonable and not enough problem of leakproofness of current collection device function process.

Description

Electrolytic aluminum hot anode scrap cooling pollutant collecting device

Technical Field

The utility model relates to a technical field is collected to the pollutant, especially relates to a hot anode scrap cooling pollutant collection device of electrolysis aluminium.

Background

In the modern aluminum industrial production, a cryolite-alumina fused salt electrolysis method is generally adopted, and in the process of smelting aluminum by adopting a pre-baking tank, an anode carbon block participates in electrolytic chemical reaction and is continuously consumed, SO that the anode carbon block in the electrolytic tank needs to be replaced according to a certain period, the temperature of the anode carbon block just replaced reaches more than 450 ℃, a large amount of NaF, AlF3, HF, SO2 and other waste gases harmful to the environment are emitted, the discharged waste gases can permeate the whole production workshop if not organized in time and intensively discharged and treated, the life health and safety of workers are seriously damaged, and the life safety of the workers is threatened when the concentration of the waste gases reaches a certain concentration value.

The structure of the single-door swinging lifting smoke exhaust hood body is generally adopted in the prior art, the structure realizes the falling back and lifting of the cooling smoke exhaust hood body through the smoke exhaust hood body which is driven by a motor and connected with a rotary swing arm, the sealing of the smoke exhaust hood body after the falling back is realized through an oil cylinder control single-side movable door, and the smoke in the smoke exhaust hood body after the sealing is intensively discharged through a telescopic hose connected with the tail part. The main disadvantages of this structure are: the stroke of the unilateral moving door is limited, because the position of the overhead crane for placing the residual anode carbon block is not accurate, the residual anode carbon block is large in thermal deformation and large in shaking amplitude, when the motor drives the smoke exhaust cover body connected with the rotary swing arm to fall back, the door frame of the smoke exhaust cover body unilateral moving door often collides with a steel bar of the residual anode carbon block, the smoke exhaust cover body is prevented from falling back, workers have to raise the smoke exhaust cover body again, the position of the residual anode carbon block is adjusted, and the production efficiency is severely limited; the upside of rod iron can make other places exist the gap after with the cover body laminating and reveal, for effectively avoiding waste gas escape, must increase the displacement, increases the investment and the working costs of follow-up exhaust-gas treatment facility.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides a hot anode scrap cooling pollutant collection device of electrolysis aluminium can improve the steady smoothness degree of the cover body function process, improves the leakproofness of the cover body simultaneously to solve the problem that current collection device function process is reasonable inadequately and the leakproofness is not enough.

In order to achieve the above purpose, the present invention is realized by the following technical solution: the electrolytic aluminum hot anode scrap cooling pollutant collecting device comprises a tray, a smoke exhaust hood body, an exhaust mechanism and a rotary driving mechanism, wherein the exhaust mechanism is connected to one side of the smoke exhaust hood body and used for intensively exhausting gas in the smoke exhaust hood body;

the top of the smoke exhaust cover body and the one side of keeping away from rotary driving mechanism have seted up the notch, the notch is used for the rod iron at residual anode carbon piece top passes, the both sides of notch are provided with first floating gate and second floating gate respectively, first floating gate and second floating gate are used for closing and beat the notch, the adjacent one side top of first floating gate and second floating gate is provided with a set of first seal assembly respectively, and two sets of first seal assembly are used for pressing from both sides tight sealing to the rod iron, one side that rotary driving mechanism was kept away from to the second floating gate is provided with the second seal assembly.

Further, first seal assembly sets up to the brush, second seal assembly includes stack floating gate and first actuating mechanism, first actuating mechanism fixes on the second floating gate, first actuating mechanism is used for driving the stack floating gate and laminates with first floating gate and second floating gate respectively mutually.

Further, first actuating mechanism includes support, first guide rail set spare and first hydro-cylinder, the support is fixed in second floating gate one side, first hydro-cylinder is fixed in the middle of the support, the extension bar of first hydro-cylinder is connected with the stack floating gate, the stack floating gate is through first guide rail set spare and support sliding connection.

Furthermore, the first movable door and the second movable door are respectively connected with a group of second driving mechanisms, and the two groups of second driving mechanisms are used for driving the first movable door and the second movable door to move.

Furthermore, the two groups of second driving mechanisms respectively comprise a second oil cylinder and a second guide rail assembly, the second oil cylinder is fixed at the top of the smoke exhaust hood body, extension rods of the two groups of second oil cylinders are respectively connected with the first movable door and the second movable door, and the first movable door and the second movable door are respectively in sliding connection with the smoke exhaust hood body through the group of second guide rail assemblies.

Furthermore, the internal portion of the exhaust hood is provided with the inlet scoop and the baffle that induced drafts, the one end of the baffle that induced drafts is connected with the inlet scoop, the one end that the inlet scoop was kept away from to the baffle that induced drafts is provided with collects the mouth, the specification that collects the mouth is greater than the specification of inlet scoop.

Further, exhaust mechanism includes swing arm pipe, gyration pipe, bend pipe and trunk line, swing arm union coupling is in one side of the cover body of discharging fume and is linked together with the inlet scoop of the internal portion of the cover of discharging fume, the swing arm pipe is kept away from the one end of the cover body of discharging fume and is linked together with the gyration pipe, the one end of gyration pipe is linked together with the pipe of bending, the pipe of bending is kept away from the one end of gyration pipe and is linked together with the trunk line, bend and be provided with the blast switch valve on the pipe.

Furthermore, the rotary driving mechanism comprises a motor, a speed reducer and a gear transmission assembly, the motor is connected with the gear transmission assembly through the speed reducer, and the gear transmission assembly is used for driving the rotary pipe to rotate.

Furthermore, one end of the rotary pipe, which is far away from the gear transmission assembly, is rotatably connected with a fixed seat through a bearing.

Furthermore, the bottom of the fixed seat and the bottom of the rotary pipe are respectively fixed with a supporting seat, reinforcing ribs are respectively fixed on two sides of the rotary pipe, which are positioned on the swing arm pipe, and one end of each reinforcing rib, which is far away from the rotary pipe, is fixed with the smoke exhaust cover body.

The utility model has the advantages that: the utility model can adjust the opening range of the notch from two sides by arranging the first movable door and the second movable door, prevent the smoke exhaust hood body from colliding with the anode scrap carbon block when falling, and improve the smooth operation of the smoke exhaust hood body;

the utility model discloses a set up the stack floating gate, can seal the notch from one side of the cover body of discharging fume, through adding the brush at the cover body top of discharging fume, the brush can follow the outside of rod iron and press from both sides tight seal to the rod iron, improves the whole sealing performance of the cover body, reduces the risk that gaseous pollutants leaked, improves the comprehensiveness of collecting.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a perspective view of the smoke evacuation cover when it is in a reset position;

FIG. 2 is a perspective view of the smoke evacuation shroud prior to sealing back down;

FIG. 3 is a schematic view of the construction of the fume extractor housing;

FIG. 4 is a view showing the rotation of the smoke evacuation cover;

FIG. 5 is a side view of the smoke evacuation shroud reset;

fig. 6 is a perspective view of the smoke evacuation cover after it has fallen back and sealed.

In the figure: 1. a tray; 2. anode scrap carbon blocks; 3. a steel bar; 4. a smoke exhaust hood body; 5. an exhaust mechanism; 6. a rotation driving mechanism; 7. a work table; 41. an air suction opening; 42. an air suction clapboard; 43. a first movable door; 44. a second movable door; 45. superposing the movable doors; 46. a first drive mechanism; 47. a second drive mechanism; 48. a brush; 461. a support; 462. a first rail assembly; 463. a first cylinder; 471. a second cylinder; 472. a second rail assembly; 51. a main pipeline; 52. bending the pipe; 53. an air volume switch valve; 54. a rotary pipe; 55. a fixed seat; 56. a swing arm pipe; 57. reinforcing ribs; 58. a supporting seat; 59. a bearing; 61. a motor; 62. a speed reducer; 63. a gear assembly.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1, fig. 1 is a perspective view of the present invention during reset.

The utility model provides a hot anode scrap cooling pollutants collection device of electrolysis aluminium, collection device fixes on workstation 7, including tray 1, the cover body 4 of discharging fume, exhaust mechanism 5 and rotary driving mechanism 6, exhaust mechanism 5 is connected and is used for discharging fume the gas concentration discharge in the cover body 4 of discharging fume 4 one side of the cover body, rotary driving mechanism 6 is used for driving the cover body 4 of discharging fume and rotates, tray 1 is used for placing anode scrap carbon piece 2, the bottom of the cover body 4 of discharging fume sets up to open structure and is identical with tray 1, anode scrap carbon piece 2 is placed on tray 1, rotary driving mechanism 6 drives the cover body and falls back and cover anode scrap carbon piece 2, the waste gas that produces in the 2 cooling process of anode scrap carbon piece can be discharged through exhaust mechanism 5.

The top of the smoke exhaust hood body 4 and one side far away from the rotary driving mechanism 6 are provided with notches, the notches are used for the steel bar 3 at the top of the residual anode carbon block 2 to pass through, two sides of the notches are respectively provided with a first movable door 43 and a second movable door 44, the first movable door 43 and the second movable door 44 are used for closing and opening the notches, the top of one side, adjacent to the first movable door 43 and the second movable door 44, is respectively provided with a group of first sealing components, the two groups of first sealing components are used for clamping and sealing the steel bar 3, one side, far away from the rotary driving mechanism 6, of the second movable door 44 is provided with a second sealing component, after the smoke exhaust hood body 4 covers the residual anode carbon block 2, the notches are closed through the first movable door 43 and the second movable door 44, the first sealing components clamp the steel bar 3 from two sides, so as to realize sealing from the top of the smoke exhaust hood body 4, and the second sealing components can seal from the side of the smoke exhaust hood body 4, the comprehensive sealing is realized, and the gas is effectively prevented from leaking.

Referring to fig. 2, fig. 2 is a perspective view of the smoke evacuation hood before the smoke evacuation hood falls back and is sealed.

Exhaust mechanism 5 includes swing arm pipe 56, the gyration pipe 54, bend pipe 52 and trunk line 51, swing arm pipe 56 is connected in the one side of the exhaust hood body 4 and is linked together with the inlet scoop 41 of the exhaust hood body 4 inside, the one end that the exhaust hood body 4 was kept away from to swing arm pipe 56 is linked together with gyration pipe 54, the one end of gyration pipe 54 is linked together with the pipe 52 of bending, the one end that gyration pipe 54 was kept away from to pipe 52 of bending is linked together with trunk line 51, be provided with air volume switch valve 53 on the pipe 52 of bending, 2 cooling process of anode scrap carbon blocks, air volume switch valve 53 is in the open mode, the waste gas of production passes through inlet scoop 41 and gets into in the swing arm pipe 56, rethread gyration pipe 54 and bend pipe 52 get into in trunk line 51, carry out concentrated emission processing through the main pipe area.

The rotary driving mechanism 6 comprises a motor 61, a speed reducer 62 and a gear transmission assembly 63, the motor 61 is connected with the gear transmission assembly 63 through the speed reducer 62, the gear transmission assembly 63 is used for driving the rotary pipe 54 to rotate, the motor 61 performs power transmission through the speed reducer 62 when operating, a driving gear connected to an output shaft of the speed reducer 62 and a driven gear arranged outside the rotary pipe 54 are arranged in the gear transmission assembly 63, the driving gear drives the driven gear to rotate so as to drive the rotary pipe 54 to rotate, and the rotary pipe 54 rotates to drive the smoke exhaust hood body 4 to rotate through the swing arm pipe 56.

The one end that the gyration pipe 54 kept away from gear drive assembly 63 is rotated through bearing 59 and is connected with fixing base 55, is used for guaranteeing the pivoted stability of gyration pipe 54 through fixing base 55.

The bottom of fixing base 55 and gyration pipe 54 is fixed with supporting seat 58 respectively, and stability when gyration pipe 54 rotates is guaranteed to supporting seat 58, and the both sides that lie in swing arm pipe 56 on the gyration pipe 54 are fixed with strengthening rib 57 respectively, and the one end that gyration pipe 54 was kept away from to strengthening rib 57 is fixed mutually with the cover body 4 of discharging fume, and strengthening rib 57 can reduce the power that swing arm pipe 56 bore, improves the steadiness when rotating.

Referring to fig. 3, fig. 3 is a schematic structural view of the smoke exhausting hood.

The first sealing assembly is set to be a hairbrush 48, the second sealing assembly comprises a superposed movable door 45 and a first driving mechanism 46, the first driving mechanism 46 is fixed on a second movable door 44, the first driving mechanism 46 is used for driving the superposed movable door 45 to be respectively attached to a first movable door 43 and a second movable door 44, the steel bar 3 has a certain width, after the first movable door 43 and the second movable door 44 are attached to the steel bar 3, a gap with the same width as the steel bar 3 exists, gas can be leaked due to the existence of the gap, the hairbrush 48 can be attached to the outer side of the steel bar 3, the hairbrush 48 is set to be a steel wire hairbrush which has certain elasticity and can be bent when being attached to the steel bar 3, the steel wire hairbrush can recover to the original shape after being bent, the setting density of the steel wire hairbrush is set according to practical use, the whole flexibility of the steel wire hairbrush is ensured while the gas leakage is reduced, the steel wire brush can be followed the top of the body 4 of discharging fume and is laminated sealed 3 steel bars.

The first driving mechanism 46 includes a bracket 461, a first rail assembly 462 and a first oil cylinder 463, the bracket 461 is fixed on one side of the second movable door 44, the first oil cylinder 463 is fixed in the middle of the bracket 461, an extending rod of the first oil cylinder 463 is connected with the superimposed movable door 45, the superimposed movable door 45 is slidably connected with the bracket 461 through the first rail assembly 462, the first oil cylinder 463 can drive the superimposed movable door 45 to move, and the superimposed movable door 45 can be connected with the first movable door 43 and the second movable door 44 from the side after moving, so as to realize the sealing of the side.

The first moving door 43 and the second moving door 44 are respectively connected with a set of second driving mechanisms 47, and the two sets of second driving mechanisms 47 are used for driving the first moving door 43 and the second moving door 44 to move.

The two sets of second driving mechanisms 47 respectively include second oil cylinders 471 and second guide rail assemblies 472, the second oil cylinders 471 are fixed at the top of the smoke exhaust hood body 4, the extension bars of the two sets of second oil cylinders 471 are respectively connected with the first moving door 43 and the second moving door 44, the first moving door 43 and the second moving door 44 are respectively connected with the smoke exhaust hood body 4 in a sliding manner through the one set of second guide rail assemblies 472, and the two sets of second oil cylinders 471 can drive the first moving door 43 and the second moving door 44 to perform closing and opening operations.

The inside inlet scoop 41 and the baffle 42 that induced drafts that is provided with of the exhaust hood body 4, the one end of the baffle 42 that induced drafts is connected with inlet scoop 41, the one end that the baffle 42 that induced drafts kept away from inlet scoop 41 is provided with collects the mouth, the specification that collects the mouth is greater than the specification of inlet scoop 41, the baffle 42 that induced drafts wholly sets up to the bottom opening and is greater than the top, the funnel-shaped structure of similar handstand setting can make waste gas be in when upwards flowing and collect the state, can make the flue gas concentrate the discharge.

Please refer to fig. 4-6; FIG. 4 is a view showing the rotation of the smoke evacuation cover; FIG. 5 is a side view of the smoke evacuation shroud reset; fig. 6 is a perspective view of the smoke evacuation cover after it has fallen back and sealed.

Fig. 5 is a state diagram of the smoke exhaust hood 4 at the reset position, when lifted, the first moving door 43 and the second moving door 44 of the smoke exhaust hood 4 are in an open state, fig. 4 is a perspective view of the smoke exhaust hood 4 in the rotation process, at this time, the first moving door 43 and the second moving door 44 open the leaked notches to allow the steel bar 3 to pass through, fig. 6 is a state diagram of the smoke exhaust hood 4 after being retracted, at this time, the first moving door 43 and the second moving door 44 are closed, the brush 48 is attached to the steel bar 3, the brush 48 at the attached position is in a bent state, the superposed moving door 45 is also in a closed state, and the whole sealing of the smoke exhaust hood 4 is realized.

The working principle is as follows: when the exhaust hood body 4 is in a lifting position in a non-working state, the lifting position belongs to a reset position, the air quantity switch valve 53 is in a closing state, the first movable door 43, the second movable door 44 and the superposed movable door 45 are in an opening state, after the anode scrap carbon block 2 is placed on the tray 1, the air quantity switch valve 53 is opened, the motor 61 is started, the motor 61 drives the rotary pipe 54 to rotate through the speed reducer 62 and the gear transmission component 63, the rotary pipe 54 is rotatably connected with the fixed seat 55 through the bearing 59, the rotary pipe 54 rotates and drives the exhaust hood body 4 to fall through the swing arm pipe 56, the steel bar 3 at the top of the anode scrap carbon block 2 passes through the notch in the falling process, the motor 61 is closed after an opening structure at the bottom of the exhaust hood body 4 is matched with the tray 1, at the moment, the first movable door 43 and the second movable door 44 are driven to move towards the middle of the notch through the second oil cylinder 471 and close the notch, the second oil cylinder 471 is stopped when the first movable door 43 and the second movable door 44 are tightly clamped with the steel bar 3, at this moment, the brush 48 is elastically attached to the steel bar 3, the brush 48 can ensure the sealing of the top of the smoke exhaust hood body 4, at this moment, the first oil cylinder 463 in the first driving mechanism 46 drives the overlapped movable door 45 to move so as to close the notch from the side, so that a closed space is formed between the smoke exhaust hood body 4 and the tray 1, waste gas generated in the cooling of the anode scrap block 2 is collected to the air suction port 41 through the air suction partition plate 42, the waste gas is discharged through the exhaust mechanism 5, after the cooling, the first movable door 43 is opened, the second movable door 44 and the overlapped movable door 45 are closed, and the air volume switch valve 53 is closed, and the starting motor 61 drives the smoke exhaust hood body 4 to reset so as to complete the primary cooling and collecting work.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The electrolytic aluminum hot anode scrap cooling pollutant collecting device is characterized by comprising a tray (1), a smoke exhaust hood body (4), an exhaust mechanism (5) and a rotary driving mechanism (6), wherein the exhaust mechanism (5) is connected to one side of the smoke exhaust hood body (4) and used for intensively exhausting gas in the smoke exhaust hood body (4), the rotary driving mechanism (6) is used for driving the smoke exhaust hood body (4) to rotate, the tray (1) is used for placing an anode scrap carbon block (2), and the bottom of the smoke exhaust hood body (4) is of an open structure and is matched with the tray (1);

the top of the smoke exhaust hood body (4) and the one side of keeping away from rotary driving mechanism (6) have been seted up the notch, the notch is used for rod iron (3) at residual anode carbon piece (2) top pass, the both sides of notch are provided with first floating gate (43) and second floating gate (44) respectively, first floating gate (43) and second floating gate (44) are used for closing and beat the notch, the adjacent one side top of first floating gate (43) and second floating gate (44) is provided with a set of first seal assembly respectively, and two sets of first seal assemblies are used for pressing from both sides tight sealedly to rod iron (3), the second floating gate (44) are kept away from one side of rotary driving mechanism (6) and are provided with the second seal assembly.

2. The device for collecting the pollutants generated in the hot anode scrap cooling of electrolytic aluminum according to claim 1, wherein the first sealing assembly is configured as a brush (48), the second sealing assembly comprises a superimposed moving door (45) and a first driving mechanism (46), the first driving mechanism (46) is fixed on the second moving door (44), and the first driving mechanism (46) is used for driving the superimposed moving door (45) to respectively abut against the first moving door (43) and the second moving door (44).

3. The electrolytic aluminum hot anode scrap cooling pollutant collecting device according to claim 2, characterized in that, the first driving mechanism (46) comprises a bracket (461), a first guide rail assembly (462) and a first oil cylinder (463), the bracket (461) is fixed on one side of the second movable door (44), the first oil cylinder (463) is fixed in the middle of the bracket (461), the extending rod of the first oil cylinder (463) is connected with the superimposed movable door (45), and the superimposed movable door (45) is connected with the bracket (461) in a sliding way through the first guide rail assembly (462).

4. The device for collecting the pollutants in the residual anode cooling of electrolytic aluminum according to claim 1, wherein a set of second driving mechanisms (47) is respectively connected to the first movable door (43) and the second movable door (44), and the two sets of second driving mechanisms (47) are used for driving the first movable door (43) and the second movable door (44) to move.

5. The device for collecting the pollutants in the residual anode cooling of the electrolytic aluminum according to claim 1, wherein the two sets of second driving mechanisms (47) respectively comprise a second oil cylinder (471) and a second guide rail assembly (472), the second oil cylinder (471) is fixed on the top of the fume exhaust hood (4), the extension bars of the two sets of second oil cylinders (471) are respectively connected with the first movable door (43) and the second movable door (44), and the first movable door (43) and the second movable door (44) are respectively connected with the fume exhaust hood (4) in a sliding manner through the set of second guide rail assembly (472).

6. The electrolytic aluminum hot residual anode cooling pollutant collecting device according to claim 1, characterized in that, the inside of the fume exhaust hood body (4) is provided with an air suction opening (41) and an air suction partition plate (42), one end of the air suction partition plate (42) is connected with the air suction opening (41), one end of the air suction partition plate (42) far away from the air suction opening (41) is provided with a collection opening, and the specification of the collection opening is larger than that of the air suction opening (41).

7. The electrolytic aluminum hot residual anode cooling pollutant collecting device according to claim 1, characterized in that the exhaust mechanism (5) comprises a swing arm pipe (56), a rotary pipe (54), a bending pipe (52) and a main pipe (51), the swing arm pipe (56) is connected to one side of the smoke exhaust hood body (4) and is communicated with an air suction opening (41) inside the smoke exhaust hood body (4), one end of the swing arm pipe (56) far away from the smoke exhaust hood body (4) is communicated with the rotary pipe (54), one end of the rotary pipe (54) is communicated with the bending pipe (52), one end of the bending pipe (52) far away from the rotary pipe (54) is communicated with the main pipe (51), and an air volume switch valve (53) is arranged on the bending pipe (52).

8. The electrolytic aluminum hot residual anode cooling pollutant collecting device according to claim 7, characterized in that the rotary driving mechanism (6) comprises a motor (61), a speed reducer (62) and a gear transmission assembly (63), the motor (61) is connected with the gear transmission assembly (63) through the speed reducer (62), and the gear transmission assembly (63) is used for driving the rotary pipe (54) to rotate.

9. The electrolytic aluminum hot anode scrap cooling pollutant collecting device according to the claim 8, characterized in that the end of the rotary pipe (54) far away from the gear transmission assembly (63) is rotatably connected with a fixed seat (55) through a bearing (59).

10. The electrolytic aluminum hot anode scrap cooling pollutant collecting device according to claim 9, characterized in that the bottom of the fixed seat (55) and the bottom of the rotary pipe (54) are respectively fixed with a supporting seat (58), the two sides of the swing arm pipe (56) on the rotary pipe (54) are respectively fixed with a reinforcing rib (57), and one end of the reinforcing rib (57) far away from the rotary pipe (54) is fixed with the smoke exhaust hood body (4).

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