Negative-pressure smoke collecting device for electric furnace

Abstract

The invention discloses an electric furnace negative pressure smoke dust trapping device, and relates to the technical field of smoke dust trapping, the electric furnace negative pressure smoke dust trapping device comprises an exhaust pipe which enables the interior to generate negative pressure through a fan, the bottom end of the exhaust pipe is fixedly connected with an outer trapping cover, and the electric furnace negative pressure smoke dust trapping device further comprises a pressure distribution mechanism which comprises a connecting pipe rotationally connected to the interior of the exhaust pipe; the bottom end of the connecting pipe is fixedly connected with a mounting ring, the outer part of the mounting ring is fixedly provided with an inner trapping cover, and the inner part of the mounting ring is provided with an adjusting assembly. According to the smoke dust collecting device, waste gas is collected more comprehensively, diffused smoke dust is prevented from escaping from the edge of the collecting cover, so that the smoke dust collecting effect is improved, the smoke dust collecting efficiency of the two air suction ports can be flexibly adjusted according to the actual diffusion range and concentration of the smoke dust, energy waste is avoided, and the efficient collecting state is kept all the time.

Description

Technical Field

[0001] The present invention relates to the technical field of soot collection, and particularly relates to a negative-pressure soot collection device for an electric furnace. Background Art

[0002] An electric furnace is an industrial device that uses electricity to generate heat. The principle is to use the Joule heat generated when an electric current passes through a conductor, or the eddy current generated by the principle of electromagnetic induction to heat an object. During the heating process of the electric furnace, oil stains, impurities, etc. on the surface of the metal material will volatilize or burn to generate soot. In order to comply with environmental protection regulations and protect the health of workers, it is necessary to collect the soot generated during the operation of the electric furnace.

[0003] Currently, in industrial production, for the waste gas and soot generated when heating materials in an electric furnace, the method of using a capture hood in combination with a fan is often adopted for collection. Usually, the capture hood is suspended above the electric furnace and connected to the fan through an exhaust pipe. With the operation of the fan, a negative-pressure environment is created inside the capture hood, so that the waste gas and soot generated during the process of heating materials in the electric furnace are sucked into the capture hood under the action of negative pressure, achieving the purpose of soot collection.

[0004] During the operation of the electric furnace, factors such as the quantity of materials input at one time, the position distribution of materials inside the electric furnace, and the airflow conditions around the electric furnace will all cause changes in the diffusion situation of waste gas and soot. Currently, the common suspended capture hood is connected to the fan through an exhaust pipe. In this structure, the suction force is strong at the central position inside the capture hood, while the suction force is weak at the edge position. When the diffusion range of the waste gas generated by the electric furnace expands, the soot located in the edge area of the capture hood is extremely likely to escape into the surrounding environment due to insufficient suction force, resulting in a reduction in the soot collection effect. Summary of the Invention

[0005] The purpose of the present invention is to propose a negative-pressure soot collection device for an electric furnace to solve the problem that when the diffusion range of the waste gas generated by the electric furnace expands, the soot located in the edge area of the capture hood is extremely likely to escape into the surrounding environment due to insufficient suction force, resulting in a reduction in the soot collection effect.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solution: A negative-pressure soot collection device for an electric furnace includes an exhaust pipe that generates negative pressure inside through a fan. The bottom end of the exhaust pipe is fixedly connected with an outer capture hood, and further includes:

[0007] A pressure distribution mechanism. The pressure distribution mechanism includes a connecting pipe rotatably connected inside the exhaust pipe. The bottom end of the connecting pipe is fixedly connected with an installation ring. An inner capture hood is fixed outside the installation ring. An air duct communicating with the exhaust pipe is provided between the inner capture hood and the outer capture hood. A plurality of blades arranged in a circumferential array are provided inside the installation ring. An adjustment component is provided inside the installation ring;

[0008] An annular suction port is formed between the bottoms of the outer capture cover and the inner capture cover. The inclination of the blade is adjusted through the adjustment assembly to distribute the negative pressure at the opening of the installation ring and the negative pressure at the annular suction port.

[0009] As a further description of the above technical solution: The adjustment assembly includes a rotating shaft fixed to one end of the blade and rotatably connected to the installation ring. One end of the rotating shaft passing through the installation ring is fixed with a first connecting rod. The bottom end of the first connecting rod is rotatably connected to a second connecting rod, and the bottom end of the second connecting rod is rotatably connected to an installation ring slidably connected to the installation ring.

[0010] As a further description of the above technical solution: The included angle between the first connecting rod and the second connecting rod is 150 degrees. The blade is perpendicular to the plane where the installation ring is located, and the maximum adjustment angle of the blade is 80 degrees.

[0011] As a further description of the above technical solution: A sealing ring for closing the air passage between the outer capture cover and the inner capture cover is slidably connected to the bottom of the air extraction pipe.

[0012] As a further description of the above technical solution: A locking unit is arranged on the outer side of the installation ring. The locking unit includes a support rod fixed to the installation ring. Elastic pins are fixed on both sides of the support rod, and clamping grooves for the elastic pins to be embedded and fixed are formed on the installation ring.

[0013] As a further description of the above technical solution: The support rod passes through the installation ring, and a baffle cloth is fixed between the support rod and the installation ring.

[0014] As a further description of the above technical solution: A scraping plate in contact with the outer wall of the inner capture cover is fixedly connected to the inner wall of the outer capture cover. The top of the connecting pipe is set as an inclined surface, and a rolling ball is arranged at the connection between the connecting pipe and the air extraction pipe.

[0015] As a further description of the above technical solution: It further includes a separation assembly. The separation assembly includes a baffle fixed to the inner wall of the air extraction pipe.

[0016] As a further description of the above technical solution: A separation hole is opened on the air extraction pipe at the height where the baffle is located. Two arc-shaped collection boxes communicating with the separation hole are sleeved outside the air extraction pipe.

[0017] As a further description of the above technical solution: A sealing ring is arranged between the collection box and the air extraction pipe, and the two collection boxes are fixed by buckles.

[0018] In summary, due to the adoption of the above technology for an electric furnace negative pressure dust collection device, the beneficial effects of the present invention are:

[0019] In this application, by setting an additional annular suction port at the bottom edge of the inner capture hood and working together with the bottom opening of the installation ring, when the range of the flue gas generated during the operation of the electric furnace expands, the exhaust gas can be collected more comprehensively, preventing the diffused soot from escaping from the edge of the capture hood, thereby improving the capture effect of the soot. Moreover, by adjusting the tilt angle of the blades, the size of the opening of the installation ring can be adjusted, thereby controlling the negative pressure at the opening of the installation ring and the annular suction port, so as to flexibly adjust the efficiency of the two suction ports in capturing soot according to the actual diffusion range and concentration of the soot, avoiding energy waste, and always maintaining an efficient capture state.

[0020] The inclined blades can guide the captured flue gas, causing the soot to be sucked into the exhaust pipe in a spiral flow. At this time, the large-particle impurities in the flue gas are more likely to be thrown towards the inner wall of the exhaust pipe under the action of centrifugal force. After being guided by the baffle, the large-particle impurities in the flue gas will be separated by inertia, achieving the preliminary filtration of the flue gas and reducing the burden on the equipment during the subsequent filtration and purification of the soot.

[0021] When the electric furnace is operating, the hot air flow generated will flow upward. Through the blades, the inner capture hood can be driven to rotate by the power of the hot air flow and the thrust of the air flow sucked under negative pressure. The rotation of the blades can promote the spiral flow of the air flow, thereby enhancing the centrifugal force received by the soot particles in the air flow and further improving the preliminary separation effect of the impurities; the rotation of the inner capture hood can guide the soot to flow directionally along its inner wall, guide the soot to gather at the bottom of the exhaust pipe, and make the flow of the soot more orderly, avoiding the irregular diffusion of the soot, which is helpful for the centralized capture of the soot.

[0022] The closed ring can control the opening and closing of the annular suction port, which is convenient for use according to actual needs. When the annular suction port is closed and the blades are vertical, the negative pressure in the installation ring is in the maximum state. The air flow passing through the installation ring can flow on both sides of the blades, and the impurities on both sides of the blades can be cleaned by the air flow, thereby extending the maintenance frequency of the blades and improving the use effect. In addition, when the inner capture hood rotates, it can also scrape off the impurities on its outer wall through the scraper, reducing the rotation resistance of the inner capture hood and the blades and improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shows the overall top view provided according to an embodiment of the present invention;

[0024] Figure 2 Shows the overall bottom view provided according to an embodiment of the present invention;

[0025] Figure 3 Shows the overall sectional perspective view provided according to an embodiment of the present invention;

[0026] Figure 4 Shows the overall sectional plan view provided according to an embodiment of the present invention;

[0027] Figure 5 shows the enlarged view at location A in Figure 4 ;

[0028] Figure 6 shows the schematic diagram of the mounting ring provided according to an embodiment of the present invention;

[0029] Figure 7 shows the enlarged view at location B in Figure 6 ;

[0030] Figure 8 shows the schematic diagram of the adjustment assembly provided according to an embodiment of the present invention;

[0031] Figure 9 shows the schematic diagram of the air flow direction provided according to an embodiment of the present invention.

[0032] Legend description:

[0033] 10. Exhaust pipe; 11. Outer capture hood;

[0034] 20. Pressure distribution mechanism; 21. Inner capture hood; 22. Mounting ring; 23. Blade; 24. Connecting pipe; 25. Adjustment assembly; 251. Rotating shaft; 252. First connecting rod; 253. Second connecting rod; 254. Mounting ring;

[0035] 30. Locking unit; 31. Support rod; 32. Elastic pin; 33. Baffle cloth;

[0036] 40. Sealing ring;

[0037] 50. Scraper;

[0038] 60. Separation assembly; 61. Baffle; 62. Collection box; 63. Sealing ring; 64. Snap fastener. Detailed implementation manners

[0039] Next, the technical solution of an electric furnace negative pressure dust capture device in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] As Figures 1-9 shown, an electric furnace negative pressure dust capture device provided by the present invention includes: an exhaust pipe 10 that generates negative pressure inside through a blower, and the bottom end of the exhaust pipe 10 is fixedly connected to an outer capture hood 11, and further includes:

[0041] The pressure distribution mechanism 20 includes a connecting pipe 24 rotatably connected inside the exhaust pipe 10. The top of the connecting pipe 24 is set as an inclined surface to prevent impurities from accumulating on the connecting pipe 24 when the soot flows through the exhaust pipe 10. To reduce the rotational resistance of the connecting pipe 24, a ball is provided at the connection between the connecting pipe 24 and the exhaust pipe 10. The bottom end of the connecting pipe 24 is fixedly connected with an installation ring 22, and an inner capture hood 21 is fixed outside the installation ring 22. An air passage communicating with the exhaust pipe 10 is provided between the inner capture hood 21 and the outer capture hood 11. The air flow passage extends to the bottoms of the outer capture hood 11 and the inner capture hood 21, so as to form an annular suction port between the bottoms of the outer capture hood 11 and the inner capture hood 21. The annular suction port and the opening of the installation ring 22 divide the bottom end of the exhaust pipe 10 into two suction ports. The exhaust pipe 10 sucks the waste gas and soot generated in the middle of the electric furnace through the opening of the installation ring 22, and sucks the diffused soot through the annular suction port, preventing the soot from escaping from the edge of the outer capture hood 11. And when the materials are scattered during the input in the electric furnace and the material spreading range is large, resulting in a large range of soot generation, the annular suction port improves the capture effect by expanding the soot capture range.

[0042] Refer to Figure 3 、 Figure 4 and Figure 5 A sealing ring 40 is slidably connected to the bottom of the exhaust pipe 10 for closing the air passage between the outer capture hood 11 and the inner capture hood 21 by moving up and down. After the air passage between the outer capture hood 11 and the inner capture hood 21 is closed, the annular suction port is no longer communicated with the exhaust pipe 10. At this time, the exhaust pipe 10 only sucks the soot through the installation ring 22 and the inner capture hood 21, which is applicable to the capture when the soot is concentrated and there is no diffusion.

[0043] Refer to Figure 6 and Figure 8 To appropriately distribute the negative pressure magnitudes inside the installation ring 22 and at the annular suction port, so as to capture the soot according to the actual soot generation situation during the operation of the electric furnace, a number of blades 23 arranged in a circumferential array are provided inside the installation ring 22. An adjustment assembly 25 for synchronously adjusting the angles of all the blades 23 is provided inside the installation ring 22. Adjusting the angles of the blades 23 can change the opening size of the installation ring 22, distribute the negative pressure magnitudes at the opening of the installation ring 22 and at the annular suction port, thereby adjusting the soot capture capabilities of the annular suction port and the opening of the installation ring 22, so as to flexibly adjust the soot capture efficiencies of the two suction ports according to the actual diffusion range and concentration of the soot, avoid energy waste, and always maintain an efficient capture state.

[0044] The adjusting assembly 25 includes a rotating shaft 251 fixed to one end of the blade 23 and rotatably connected to the mounting ring 22. A first connecting rod 252 is fixed to one end of the rotating shaft 251 passing through the mounting ring 22. The bottom end of the first connecting rod 252 is rotatably connected to a second connecting rod 253. The bottom end of the second connecting rod 253 is rotatably connected to a mounting ring 254 slidably connected to the mounting ring 22. By pushing the mounting ring 254 upward, the second connecting rod 253 is driven to move upward to push the first connecting rod 252 to rotate, and then the blade 23 is driven to deflect by the rotating shaft 251, realizing the angle adjustment of the blade 23. Since the temperature above the electric furnace is relatively high, the mounting ring 254 can be pushed before the electric furnace is turned on or after the position of the mounting ring 22 is raised.

[0045] When the exhaust pipe 10 sucks the soot only through the mounting ring 22 and the inner capture hood 21, the negative pressure in the mounting ring 22 is in the maximum state. At this time, the flow velocity of the air flow passing through the mounting ring 22 is the fastest. When the blade 23 is perpendicular to the mounting ring 22, that is, parallel to the air flow direction, the air flow can wash both sides of the blade 23, achieving the effect of cleaning the blade 23 and prolonging the cleaning and maintenance time of the blade 23.

[0046] The included angle between the first connecting rod 252 and the second connecting rod 253 is 150 degrees. The blade 23 is perpendicular to the plane where the mounting ring 22 is located and the maximum adjustment angle of the blade 23 is 80 degrees. By controlling the adjustment angle of the blade 23, the degree of shielding the opening of the mounting ring 22 by the blade 23 can be changed, and then the negative pressure at the opening of the mounting ring 22 and the annular suction port can be adjusted. Moreover, the larger the inclination angle of the blade 23, the smaller the air flow at the opening of the mounting ring 22, and it is more difficult for the inclined blade 23 to drive the mounting ring 22 and the inner capture hood 21 to rotate by the air flow thrust. Therefore, when the soot spreads widely, there is no need to collect a small amount of soot in the middle of the electric furnace through the inner capture hood 21. At this time, the negative pressure at the opening of the mounting ring 22 is greatly reduced, so that the rotation speed of the inner capture hood 21 is greatly decreased, reducing the ability of the inner capture hood 21 to collect the soot in the middle of the electric furnace, reducing the disturbance of the rotation of the inner capture hood 21 to the soot, and preventing the further spread of the soot, so as to enhance the ability to capture the soot through the annular suction port.

[0047] Refer to Figure 6 and Figure 7, To facilitate the fixation of the closed ring 40 and the mounting ring 254 after position adjustment, locking units 30 are provided on the outer sides of both the mounting ring 254 and the closed ring 40. The locking unit 30 includes two sets of support rods 31 respectively fixed to the mounting ring 254 and the closed ring 40. Elastic pins 32 are fixed on both sides of the support rods 31. Slots for the elastic pins 32 to be embedded and fixed are provided on both the mounting ring 22 and the air extraction pipe 10. When adjusting the height of the closed ring 40 or the mounting ring 254, manually pinch the elastic pins 32 into the interior of the support rods 31 to disengage the elastic pins 32 from the slots. Then, pushing the support rods 31 can drive the closed ring 40 or the mounting ring 254 to move in the vertical direction. After the adjustment is completed, release the elastic pins 32. After the elastic pins 32 pop out, they are embedded into the slots to achieve fixation.

[0048] The support rods 31 penetrate through the mounting ring 22. To prevent soot from entering the interior of the mounting ring 22, a baffle cloth 33 that shields the holes at the positions where the support rods 31 penetrate through the mounting ring 22 is fixed between the support rods 31 and the mounting ring 22.

[0049] Refer to Figure 2 and Figure 3 , It further includes a separation component 60. The separation component 60 includes a baffle 61 fixed to the inner wall of the air extraction pipe 10. A separation hole is provided on the air extraction pipe 10 at the height where the baffle 61 is located. Two arc-shaped collection boxes 62 communicating with the separation hole are sleeved outside the air extraction pipe 10. When the air flow passes through the mounting ring 22, it can push the inclined blades 23, causing the blades 23 to drive the mounting ring 22 and the inner capture hood 21 to rotate. The rotation of the inclined blades 23 can make the air flow passing through the mounting ring 22 flow in a spiral manner, so that the soot particles in the air flow are thrown towards the position close to the inner wall of the air extraction pipe 10 under the action of centrifugal force. Then, the air flow is blocked by the baffle 61, and some of the soot particles carried in the air flow are discharged into the collection boxes 62 from the separation hole due to inertia, achieving the preliminary filtration of the soot.

[0050] The rotation of the inner capture hood 21 can also guide the soot to flow directionally along its inner wall, guide the soot to gather at the bottom of the mounting ring 22, and make the flow of the soot more orderly, avoiding the irregular diffusion of the soot, which is helpful for the centralized capture of the soot.

[0051] A sealing ring 63 is provided between the collection boxes 62 and the air extraction pipe 10 to prevent soot leakage, so that the air flow discharging impurities through inertia returns to the air extraction pipe 10. The two collection boxes 62 are fixed by a buckle 64, which is convenient for the disassembly and cleaning of the collection boxes 62, and enables the two collection boxes 62 to be fastened to the air extraction pipe 10, improving the sealing performance between the collection boxes 62 and the air extraction pipe 10.

[0052] Refer to Figure 2, since during the process of the soot passing through the air duct between the outer trapping hood 11 and the inner trapping hood 21, impurities in the soot will adhere to the inner trapping hood 21, increasing the rotational resistance of the inner trapping hood 21. To solve this problem, a scraping plate 50 in contact with the outer wall of the inner trapping hood 21 is fixedly connected to the inner wall of the outer trapping hood 11. When the inner trapping hood 21 rotates, the scraping plate 50 scrapes off the impurities adhering to the outer wall of the inner trapping hood 21, reducing the rotational resistance of the inner trapping hood 21 and the blades 23 and improving the operating efficiency.

[0053] Working principle: When the waste gas soot generated during the operation of the electric furnace does not diffuse, the sealing ring 40 is in the lowest position to close the air duct between the outer trapping hood 11 and the inner trapping hood 21, and the suction pipe 10 traps the waste gas soot through the connecting pipe 24 and the mounting ring 22;

[0054] When there are few impurities in the soot, the blades 23 are kept perpendicular to the mounting ring 22. At this time, the air flow will not push the blades 23 to rotate, and when the air flow passes through the mounting ring 22, it pushes the impurities on the surface of the blades 23, achieving a cleaning effect on the blades 23;

[0055] When there are many impurities in the soot, manually pinch the elastic pin 32 into the inside of the support rod 31 to disengage the elastic pin 32 from the card slot. Then, push the support rod 31 to drive the mounting ring 254 to move upward, causing the second connecting rod 253 to move upward and push the first connecting rod 252 to rotate. Subsequently, the blades 23 are driven to deflect by the rotating shaft 251, realizing the angle adjustment of the blades 23. After the adjustment is completed, release the elastic pin 32. After the elastic pin 32 pops out, it is embedded in the card slot to fix the support rod 31 and the mounting ring 254. When the air flow passes through the mounting ring 22, it pushes the blades 23 to rotate, driving the mounting ring 22 and the inner trapping hood 21 to rotate. The rotation of the inner trapping hood 21 keeps the air flow concentrated, and the inclined and rotating blades 23 enable the air flow to flow in a spiral state when entering the suction pipe 10, causing the soot particles in the air flow to be thrown towards the position close to the inner wall of the suction pipe 10 by the centrifugal force. Then, the air flow is blocked by the baffle 61, and some of the soot particles carried in the air flow are discharged into the collection box 62 through the separation holes due to inertia, realizing the preliminary filtration of the soot.

[0056] When the electric furnace soot shows mild diffusion, the blades 23 are slightly deflected by the above method, and the sealing ring 40 is moved upward and fixed to the suction pipe 10 through the locking unit 30. At this time, the air duct between the outer trapping hood 11 and the inner trapping hood 21 is opened, and part of the negative pressure of the suction pipe 10 is distributed to the annular suction port. When the soot approaches the edge of the outer trapping hood 11, it is trapped by the annular suction port, preventing the soot from escaping. At this time, the blades 23 are slightly deflected and can rotate rapidly with the help of the air flow thrust, driving the mounting ring 22 and the blades 23 to rotate, causing the soot to gather and contributing to the preliminary filtration of the soot;

[0057] When collecting a large range of soot, by increasing the tilt angle of the blade 23 to reduce the opening of the mounting ring 22, the negative pressure at the annular suction port is increased, and the suction force of the annular suction port is increased, making it easier to capture the escaping soot and avoiding soot escape.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical concept of an electric furnace negative pressure soot collection device and its invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. A negative pressure smoke collection device for an electric furnace, comprising an exhaust pipe (10) which generates negative pressure inside through a fan, the bottom end of the exhaust pipe (10) being fixedly connected to an outer collection cover (11), characterized in that: Also includes: A pressure distribution mechanism (20), the pressure distribution mechanism (20) comprising a connecting pipe (24) rotatably connected to the inside of the exhaust pipe (10), a mounting ring (22) being fixedly connected to the bottom end of the connecting pipe (24), an inner collecting cover (21) being fixed to the outside of the mounting ring (22), an air passage communicating with the exhaust pipe (10) being provided between the inner collecting cover (21) and the outer collecting cover (11), a plurality of blades (23) arranged in a circumferential array being provided inside the mounting ring (22), and an adjusting component (25) being provided inside the mounting ring (22); An annular suction port is formed between the bottoms of the outer collecting cover (11) and the inner collecting cover (21), and the inclination of the blade (23) is adjusted by the adjusting component (25) to distribute the negative pressure at the opening of the mounting ring (22) and the negative pressure at the annular suction port.

2. The negative pressure smoke collection device for an electric furnace according to claim 1, characterized in that: The adjustment assembly (25) comprises a rotating shaft (251) fixed to one end of the blade (23) and rotatably connected to the mounting ring (22); the rotating shaft (251) passes through one end of the mounting ring (22) and is fixed with a first connecting rod (252); the bottom end of the first connecting rod (252) is rotatably connected to a second connecting rod (253); the bottom end of the second connecting rod (253) is rotatably connected to a mounting ring (254) slidably connected to the mounting ring (22).

3. The negative pressure smoke collection device for an electric furnace according to claim 2, characterized in that: The angle between the first connecting rod (252) and the second connecting rod (253) is one hundred and fifty degrees, the blade (23) is perpendicular to the plane where the mounting ring (22) is located, and the maximum adjustment angle of the blade (23) is eighty degrees.

4. The negative pressure smoke collection device for an electric furnace according to claim 1, characterized in that: A closing ring (40) for closing the air passage between the outer collecting hood (11) and the inner collecting hood (21) is slidably connected to the bottom of the air extraction pipe (10).

5. The negative pressure smoke collection device for an electric furnace according to claim 2, characterized in that: A locking unit (30) is arranged on the outer side of the mounting ring (254), and the locking unit (30) comprises a support rod (31) fixed to the mounting ring (254), elastic pins (32) are fixed on both sides of the support rod (31), and a slot for the elastic pin (32) to be embedded and fixed is provided on the mounting ring (22).

6. The negative pressure smoke collection device for an electric furnace according to claim 5, characterized in that: The support rod (31) passes through the installation ring (22), and a blocking cloth (33) is fixed between the support rod (31) and the installation ring (22).

7. The negative pressure smoke collection device for an electric furnace according to claim 1, characterized in that: The inner wall of the outer collecting cover (11) is fixedly connected with a scraper (50) in contact with the outer wall of the inner collecting cover (21); the top of the connecting pipe (24) is arranged as an inclined surface; and a ball bearing is arranged at the connection between the connecting pipe (24) and the exhaust pipe (10).

8. The negative pressure smoke collection device for an electric furnace according to claim 1, characterized in that: It also includes a separation component (60), wherein the separation component (60) includes a baffle (61) fixed to the inner wall of the exhaust pipe (10).

9. The negative pressure smoke collection device for an electric furnace according to claim 8, characterized in that: A separation hole is provided on the air extraction pipe (10) at the height of the baffle plate (61), and two arc-shaped collection boxes (62) in communication with the separation hole are sleeved on the outside of the air extraction pipe (10).

10. The negative pressure smoke collection device for an electric furnace according to claim 9, characterized in that: A sealing ring (63) is provided between the collection box (62) and the air extraction pipe (10), and the two collection boxes (62) are fixed by means of a buckle (64).

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