An environment-friendly cupola furnace for metal casting

Abstract

The present invention discloses an environment-friendly cupola for metal casting, which relates to the technical field of cupola tail gas treatment. Its technical key points include a cupola body and a tail gas inlet pipe fixedly installed at the exhaust end of the cupola body. A tail gas purification and heat absorption mechanism is arranged at the exhaust end of the cupola body, and a filter screen cleaning mechanism is arranged on the tail gas purification and heat absorption mechanism. The output end of the tail gas purification and heat absorption mechanism is communicated with a pure tail gas heat recovery mechanism. The tail gas purification and heat absorption mechanism includes a purification box. A filter screen is fixedly installed at the center of the inner cavity of the purification box. The filter screen divides the inner cavity of the purification box into a dust cavity and a pure tail gas cavity. The technical effect is that the tail gas purification and heat absorption mechanism effectively blocks the dust and other impurities in the tail gas and deposits them at the bottom of the dust cavity, realizing the purification treatment of the tail gas. At the same time, the precious energy in these dusts is absorbed by the cooling water through heat conduction, improving the energy capture and utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cupola tail gas treatment, and specifically to an environment-friendly cupola for metal casting. Background Art

[0002] The cupola, as a metal melting equipment with a long history, is widely used in the casting industry, especially playing a key role in the smelting process of ferroalloys and non-ferrous metals. It generates intense combustion by blowing air or oxygen-enriched air with fuels such as coke, and the high-temperature flame directly heats the furnace charge to make it melt. In this process, in addition to meeting the heat energy required for smelting, a large amount of waste heat is also released. This waste heat usually exists in the form of flue gas, containing considerable energy potential.

[0003] Currently, there are deficiencies in the tail gas treatment of cupolas. Although methods such as dry dust removal, wet dust removal, and composite dust removal are used to remove dust in the tail gas and ensure that the purified tail gas meets the discharge standards, the heat contained in the filtered dust and the tail gas itself has not been effectively recovered and utilized. Therefore, we propose a new type of environment-friendly cupola for metal casting. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides an environment-friendly cupola for metal casting, which solves the problem that the heat contained in the filtered dust and the tail gas itself in the current cupola tail gas has not been effectively recovered and utilized.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solution: an environment-friendly cupola for metal casting, including a cupola body and a tail gas inlet pipe fixedly installed at the exhaust end of the cupola body. A tail gas purification and heat absorption mechanism is arranged at the exhaust end of the cupola body, a filter screen cleaning mechanism is arranged on the tail gas purification and heat absorption mechanism, and the output end of the tail gas purification and heat absorption mechanism is communicated with a pure tail gas heat recovery mechanism.

[0008] The tail gas purification and heat absorption mechanism includes a purification box, and a filter screen is fixedly installed at the center of the inner cavity of the purification box. The filter screen divides the inner cavity of the purification box into a dust cavity and a pure tail gas cavity.

[0009] A hollow plate is fixedly installed on one side of the inner cavity of the dust cavity away from the filter screen. Arc-shaped hollow fins are fixedly installed on the side of the hollow plate close to the filter screen. A three-way water injection pipe communicated with the inner cavity of the hollow plate is fixedly installed at the top of the hollow plate, and a three-way drain pipe communicated with the inner cavity of the hollow plate is fixedly installed at the bottom of the hollow plate.

[0010] A pure tail gas conduit communicating with the inner cavity of the pure tail gas chamber is fixedly installed on the right side of the purification box, and a detachable bottom cover is threadedly connected to the center of the bottom of the purification box.

[0011] The filter screen includes a hollow frame adapted to the purification box, and a number of hollow metal conduits woven in a staggered manner are fixed inside the hollow frame, and the hollow metal conduits communicate with the inner cavity of the hollow frame.

[0012] Preferably, the dust chamber communicates with the output end of the tail gas inlet pipe.

[0013] Preferably, both the hollow plate and the arc-shaped hollow fins are made of stainless steel sheet materials.

[0014] Preferably, the other lower port of the three-way water injection pipe communicates with the top of the inner cavity of the hollow frame, the upper port of the three-way water injection pipe extends to the top of the purification box, the other upper port of the three-way drain pipe communicates with the bottom of the inner cavity of the hollow frame, and the lower port of the three-way drain pipe extends to the bottom of the purification box.

[0015] Preferably, the filter screen cleaning mechanism includes a gear member rotatably connected to the center of the top of the filter screen. One side of the gear member is fixedly installed with a shaft rod, and one end of the shaft rod away from the gear member is fixedly installed with a motor. A guide rail is arranged below the gear member, and a gear rack meshing with the gear member is slidably connected to the inner side of the guide rail. A cleaning brush contacting the filter screen is fixedly installed at the bottom of the gear rack.

[0016] Preferably, the motor is fixedly installed outside the purification box, and the output end of the motor is fixedly connected to the shaft rod.

[0017] Preferably, the pure tail gas heat recovery mechanism includes a water tank communicating with the pure tail gas conduit. One end of the pure tail gas conduit away from the purification box is fixedly installed with an arc-shaped ball heat exchanger. One end of the arc-shaped ball heat exchanger away from the pure tail gas conduit is fixedly installed with an exhaust pipe, and an electric valve is fixedly installed on the outside of the water tank.

[0018] Preferably, the arc-shaped ball heat exchanger includes a plurality of arc-shaped heat exchange pipes communicating with one end of the pure tail gas conduit away from the purification box. A plurality of hollow heat exchange plates are fixedly installed on the outside of the plurality of arc-shaped heat exchange pipes, and the hollow heat exchange plates are used to communicate the plurality of arc-shaped heat exchange pipes.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides one, having the following beneficial effects:

[0021] 1. Through the design of the exhaust gas purification and heat absorption mechanism, the present invention effectively blocks dust and other impurities in the exhaust gas, deposits them at the bottom of the dust chamber, realizes the purification treatment of the exhaust gas, and at the same time, the valuable energy in these dust and impurities is absorbed by the cooling water through heat conduction, improving the energy capture and utilization efficiency.

[0022] 2. Through the design of the filter screen and its cleaning mechanism, the present invention not only ensures the efficient filtration of dust particles in the exhaust gas, but also effectively extends the service life of the filter screen by regularly and automatically cleaning the filter screen, maintaining the overall performance of the exhaust gas purification and heat absorption mechanism, thereby ensuring the stability and efficiency of heat recovery.

[0023] 3. Through the design of the pure exhaust gas heat recovery mechanism, the present invention uses the arc-shaped ball heat exchange element to increase the heat exchange area, optimize the heat exchange path, and further improve the exhaust gas heat recovery efficiency. The recovered heat can be used to preheat other media or for other technological processes, such as heating, hot water supply, etc., realizing the effective utilization of exhaust gas waste heat and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic rear structural diagram of the present invention;

[0026] Figure 3 is a schematic structural diagram of the detachable bottom cover of the present invention;

[0027] Figure 4 is a schematic front structural diagram of the present invention;

[0028] Figure 5 is a schematic sectional structural diagram of the exhaust gas purification and heat absorption mechanism of the present invention;

[0029] Figure 6 is a schematic structural diagram of the filter screen cleaning mechanism of the present invention;

[0030] Figure 7 is a schematic structural diagram of the filter screen of the present invention;

[0031] Figure 8 is a schematic structural diagram of the cleaning brush of the present invention;

[0032] Figure 9 is a schematic structural diagram of the gear member of the present invention;

[0033] Figure 10 is a schematic sectional structural diagram of the pure exhaust gas heat recovery mechanism of the present invention;

[0034] Figure 11 is a schematic structural diagram of the arc-shaped ball heat exchange element of the present invention.

[0035] In the figure:

[0036] 1. Cupola body; 11. Tail gas inlet pipe;

[0037] 2. Tail gas purification and heat absorption mechanism; 21. Purification box; 22. Filter screen; 221. Hollow frame; 222. Hollow metal conduit; 23. Dust chamber; 24. Pure tail gas chamber; 25. Hollow plate; 26. Arc-shaped hollow fin; 27. Three-way water injection pipe; 28. Three-way drain pipe; 29. Pure tail gas conduit; 210. Detachable bottom cover;

[0038] 3. Filter screen cleaning mechanism; 31. Gear part; 32. Shaft rod; 33. Motor; 34. Guide rail; 35. Rack; 36. Cleaning brush;

[0039] 4. Pure tail gas heat recovery mechanism; 41. Water tank; 42. Arc-shaped ball heat exchange part; 421. Arc-shaped heat exchange pipe; 422. Hollow heat exchange plate; 43. Exhaust pipe; 44. Electric valve. Specific implementation manners

[0040] In the present invention, unless otherwise stated, the orientations such as "upper and lower" are generally in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left and right" are generally left and right as shown in the drawings; "inside and outside" refer to the inside and outside relative to the contours of each component itself, but the above orientation terms are not used to limit the present invention.

[0041] The present invention provides a technical solution:

[0042] Please refer to Figures 1 to 11 , an environment-friendly cupola for metal casting, including a cupola body 1 and a tail gas inlet pipe 11 fixedly installed at the exhaust end of the cupola body 1. A tail gas purification and heat absorption mechanism 2 is arranged at the exhaust end of the cupola body 1. A filter screen cleaning mechanism 3 is arranged on the tail gas purification and heat absorption mechanism 2. The output end of the tail gas purification and heat absorption mechanism 2 is communicated with a pure tail gas heat recovery mechanism 4.

[0043] The tail gas purification and heat absorption mechanism 2 includes a purification box 21. A filter screen 22 is fixedly installed at the center of the inner cavity of the purification box 21. The filter screen 22 divides the inner cavity of the purification box 21 into a dust chamber 23 and a pure tail gas chamber 24. Through the filter screen 22 in the tail gas purification and heat absorption mechanism 2 and the dust chamber 23 and the pure tail gas chamber 24 on both sides thereof, the purification and diversion of the tail gas are realized, ensuring that the heat recovery is carried out in a purer environment, improving the heat recovery efficiency, reducing the dust emission at the same time, and protecting the environment.

[0044] On the side of the inner cavity of the dust chamber 23 away from the filter screen 22, a hollow plate 25 is fixedly installed. On the side of the hollow plate 25 close to the filter screen 22, an arc-shaped hollow fin 26 is fixedly installed. At the top of the hollow plate 25, a three-way water injection pipe 27 communicating with the inner cavity of the hollow plate 25 is fixedly installed. At the bottom of the hollow plate 25, a three-way drain pipe 28 communicating with the inner cavity of the hollow plate 25 is fixedly installed. Through the hollow plate 25 and the arc-shaped hollow fin 26 in the dust chamber 23, in cooperation with the three-way water injection pipe 27 and the three-way drain pipe 28, an efficient heat exchange system is formed, which can absorb the heat in the tail gas and dust, and through the circulation of cooling water, realize the recovery and utilization of heat, and at the same time keep the inside of the tail gas purification and heat absorption mechanism 2 clean.

[0045] On the right side of the purification box 21, a pure tail gas conduit 29 communicating with the inner cavity of the pure tail gas chamber 24 is fixedly installed. At the center of the bottom of the purification box 21, a detachable bottom cover 210 is threadedly connected. The purified tail gas is led to the heat recovery mechanism through the pure tail gas conduit 29, and the detachable bottom cover 210 is convenient for cleaning the dust accumulated in the dust chamber 23. The two together ensure the efficient operation of the tail gas purification and heat absorption mechanism 2 and the long-term stability of the cupola.

[0046] The filter screen 22 includes a hollow frame 221 adapted to the purification box 21. Inside the hollow frame 221, a number of criss-cross woven hollow metal conduits 222 are fixed. The hollow metal conduits 222 communicate with the inner cavity of the hollow frame 221. Through the design of the hollow frame 221 of the filter screen 22 and the criss-cross woven hollow metal conduits 222 inside, the contact area between the tail gas and the cooling water is increased, the heat recovery efficiency is improved, and at the same time the dust in the tail gas is effectively blocked, ensuring the tail gas purification effect.

[0047] Further, the dust chamber 23 is communicated with the output end of the tail gas inlet pipe 11. Through the design of connecting the lower left corner of the dust chamber 23 with the tail gas inlet pipe 11, it is ensured that the high-temperature tail gas can smoothly enter the dust chamber 23, and the dust is effectively filtered by the filter screen 22, providing pure tail gas for subsequent heat recovery and improving the efficiency of the entire tail gas treatment process.

[0048] Further, both the hollow plate 25 and the arc-shaped hollow fin 26 are made of stainless steel thin sheet materials. By using stainless steel thin sheets to make the hollow plate 25 and the arc-shaped hollow fin 26, they have the characteristics of corrosion resistance and high temperature resistance, ensuring long-term stable heat absorption and conduction effects, and improving the reliability and efficiency of the cupola tail gas energy recovery.

[0049] Furthermore, the other lower port of the three-way water injection pipe 27 is connected to the top of the inner cavity of the hollow frame 221, the upper port of the three-way water injection pipe 27 extends to the top of the purification box 21, and the other upper port of the three-way drainage pipe 28 is connected to the bottom of the inner cavity of the hollow frame 221, and the lower port of the three-way drainage pipe 28 extends to the bottom of the purification box 21. By designing the three-way water injection pipe 27 and the three-way drainage pipe 28, the circulation of cooling water inside the hollow plate 25 and the filter screen 22 is achieved, thereby effectively absorbing the heat in the exhaust gas, improving the energy utilization efficiency, and ensuring the stable operation of the exhaust gas purification heat absorption mechanism 2.

[0050] Furthermore, the filter cleaning mechanism 3 includes a gear member 31 rotatably connected to the top center of the filter 22, a shaft rod 32 is fixedly installed on one side of the gear member 31, a motor 33 is fixedly installed on the end of the shaft rod 32 away from the gear member 31, a guide rail 34 is arranged below the gear member 31, a gear bar 35 meshing with the gear member 31 is slidably connected to the inner side of the guide rail 34, a cleaning brush 36 in contact with the filter 22 is fixedly installed at the bottom of the gear bar 35, the gear member 31 is driven to rotate by the motor 33, and the gear bar 35 is driven to slide on the guide rail 34, so that the cleaning brush 36 brushes away the dust accumulated on the filter 22, ensuring the smooth flow of exhaust gas and continuous and efficient filtration of the filter 22, thereby improving the operating efficiency and stability of the blast furnace.

[0051] Furthermore, the motor 33 is fixedly installed on the outside of the purification box 21, and the output end of the motor 33 is fixedly connected to the shaft rod 32. The motor 33 is fixedly installed on the outside of the purification box 21 and is fixedly connected to the shaft rod 32 to ensure stable driving of the filter cleaning mechanism 3. Through the rotational output of the motor 33, the cleaning brush 36 on the filter is driven to move, thereby realizing automatic cleaning of the filter 22 and ensuring long-term and efficient operation of the cupola.

[0052] Furthermore, the pure exhaust gas heat recovery mechanism 4 includes a water tank 41 connected to the pure exhaust gas duct 29, an arc-shaped ball heat exchanger 42 is fixedly installed at one end of the pure exhaust gas duct 29 away from the purification box 21, an outer discharge pipe 43 is fixedly installed at one end of the arc-shaped ball heat exchanger 42 away from the pure exhaust gas duct 29, and an electric valve 44 is fixedly installed on the outside of the water tank 41. The heat in the pure exhaust gas is efficiently absorbed by the arc-shaped ball heat exchanger 42 and transferred to the water in the water tank 41, thereby realizing waste heat recovery; the electric valve 44 facilitates the control of the use of hot water, thereby improving the convenience and flexibility of energy utilization.

[0053] Further, the arc-shaped heat exchange member 42 includes a plurality of arc-shaped heat exchange tubes 421 communicated with one end of the pure tail gas conduit 29 away from the purification tank 21. A plurality of hollow heat exchange plates 422 are fixedly installed on the outer sides of the plurality of arc-shaped heat exchange tubes 421. The hollow heat exchange plates 422 are used to communicate the plurality of arc-shaped heat exchange tubes 421. By combining the arc-shaped heat exchange tubes 421 with the hollow heat exchange plates 422, the heat exchange area is significantly increased, the heat exchange path is optimized, thereby improving the recovery efficiency of the tail gas heat and realizing the efficient utilization of energy.

[0054] During specific use, the working principle of the present invention is as follows:

[0055] The tail gas generated by the cupola body 1 is guided from the tail gas inlet pipe 11 to the tail gas purification and heat absorption mechanism 2 for further treatment.

[0056] Process of tail gas purification and absorption of dust heat:

[0057] The high-temperature tail gas enters the dust chamber 23 of the tail gas purification and heat absorption mechanism 2 from the tail gas inlet pipe 11. Inside the dust chamber 23, the tail gas first encounters the filter screen 22, which is composed of a hollow frame 221 and internally interwoven hollow metal conduits 222, effectively blocking the dust particles and other impurities in the tail gas and depositing them at the bottom of the dust chamber 23. This step not only purifies the tail gas but also provides a cleaner working environment for subsequent heat recovery.

[0058] To maximize the absorption of heat in the tail gas, cooling water is injected from the three-way water injection pipe 27 into the hollow plate 25, the arc-shaped hollow fins 26, and the hollow frame 221 and hollow metal conduits 222 of the filter screen 22. When the cooling water flows in the hollow plate 25 and the arc-shaped hollow fins 26, it absorbs the heat of the dust and impurities inside the dust chamber 23 through heat conduction, and at the same time, part of the heat in the tail gas is also absorbed by the cooling water inside the arc-shaped hollow fins 26 and the hollow plate 25. The cooling water in the hollow frame 221 and hollow metal conduits 222 of the filter screen 22 further absorbs the heat of the tail gas when passing through the filter screen. This design not only improves the heat recovery efficiency but also ensures the full absorption of heat by increasing the heat exchange area and extending the heat exchange path.

[0059] The cooling water that has absorbed heat then discharges from the three-way drain pipe 28 of the hollow plate 25 and the filter screen 22. These high-temperature waters can be used to preheat other media or for other technological processes, such as heating, hot water supply, etc., realizing the effective utilization of the waste heat of the tail gas.

[0060] Filter screen cleaning process:

[0061] To ensure the continuous and efficient filtering ability of the filter screen 22, the filter screen cleaning mechanism 3 regularly and automatically cleans the filter screen 22. After the motor 33 is started, through the rotation of the drive shaft rod 32 and the gear member 31, it meshes with the rack 35 and drives it to slide on the guide rail 34. The cleaning brush 36 at the bottom of the rack 35 slides accordingly, brushing off the dust accumulated on the surface of the filter screen 22 to ensure unobstructed exhaust gas. This cleaning process not only effectively extends the service life of the filter screen 22, but also maintains the overall performance of the exhaust gas purification and heat absorption mechanism 2, ensuring the stability and efficiency of heat recovery.

[0062] Process of pure exhaust gas heat recovery:

[0063] The purified exhaust gas enters the pure exhaust gas heat recovery mechanism 4 through the pure exhaust gas conduit 29. Inside the arc-shaped ball heat exchange member 42, the exhaust gas exchanges heat with the water in the water tank 41. The arc-shaped ball heat exchange member 42 is composed of 8 arc-shaped heat exchange tubes 421 and 7 hollow heat exchange plates 422. This design increases the heat exchange area, optimizes the heat exchange path, and improves the heat exchange efficiency. The heat in the exhaust gas is transferred to the water in the water tank 41, raising the water temperature. The heated water can be used for other technological processes or heating systems, such as factory hot water supply, equipment preheating, etc., realizing the efficient recovery and utilization of the exhaust gas heat. When it is necessary to use the hot water in the water tank 41, just open the electric valve 44 to draw water, which is simple to operate and safe and reliable.

[0064] Maintenance and cleaning process:

[0065] To ensure the long-term stable operation of the cupola and the efficient operation of the exhaust gas purification and heat absorption mechanism 2, it is necessary to regularly maintain and clean the purification box 21. By opening the bottom of the purification box 21 through the detachable bottom cover 210, the dust and impurities in the dust chamber 23 can be conveniently cleaned. This operation not only keeps the exhaust gas purification and heat absorption mechanism 2 clean and efficiently operating, but also extends the service life of the entire cupola, reducing the maintenance cost and environmental burden.

[0066] In summary, through the effective combination of the exhaust gas purification and heat absorption mechanism 2 and the pure exhaust gas heat recovery mechanism 4, this environmentally friendly cupola for metal casting realizes the full utilization of exhaust gas waste heat and the purification treatment of emissions. This innovative design not only improves the energy utilization efficiency of the casting industry, but also reduces environmental pollution and promotes the sustainable development of the casting industry.

[0067] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements, or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. An environmentally friendly cupola for metal casting, comprising a cupola body (1) and an exhaust gas inlet pipe (11) fixedly mounted at the exhaust end of the cupola body (1), characterized in that: The exhaust end of the cupola body (1) is provided with an exhaust gas purification heat absorption mechanism (2), a filter screen cleaning mechanism (3) is provided on the exhaust gas purification heat absorption mechanism (2), and the output end of the exhaust gas purification heat absorption mechanism (2) is connected to a pure exhaust gas heat recovery mechanism (4); The exhaust gas purification heat absorption mechanism (2) comprises a purification box (21), a filter screen (22) is fixedly installed at the center of the inner cavity of the purification box (21), and the filter screen (22) divides the inner cavity of the purification box (21) into a dust cavity (23) and a pure exhaust gas cavity (24); A hollow plate (25) is fixedly mounted on a side of the inner cavity of the dust chamber (23) away from the filter screen (22), and an arc-shaped hollow fin (26) is fixedly mounted on a side of the hollow plate (25) close to the filter screen (22); A three-way water injection pipe (27) communicating with the inner cavity of the hollow plate (25) is fixedly installed on the top of the hollow plate (25), and a three-way drainage pipe (28) communicating with the inner cavity of the hollow plate (25) is fixedly installed on the bottom of the hollow plate (25); A clean exhaust gas conduit (29) communicating with the inner cavity of the clean exhaust gas cavity (24) is fixedly installed on the right side of the purification box (21), and a detachable bottom cover (210) is threadedly connected at the center of the bottom of the purification box (21); The filter screen (22) comprises a hollow frame (221) adapted to the purification box (21), a plurality of interlaced hollow metal conduits (222) being fixed inside the hollow frame (221), and the hollow metal conduits (222) being communicated with the inner cavity of the hollow frame (221); The clean exhaust gas heat recovery mechanism (4) comprises a water tank (41) connected to the clean exhaust gas conduit (29); an arc-shaped ball heat exchanger (42) is fixedly mounted on one end of the clean exhaust gas conduit (29) away from the purification box (21); an outer discharge pipe (43) is fixedly mounted on one end of the arc-shaped ball heat exchanger (42) away from the clean exhaust gas conduit (29); and an electric valve (44) is fixedly mounted on the outer side of the water tank (41); The arc-shaped spherical heat exchange element (42) comprises a plurality of arc-shaped heat exchange tubes (421) connected to one end of the clean exhaust gas duct (29) away from the purification box (21); a plurality of hollow heat exchange plates (422) are fixedly mounted on the outer sides of the plurality of arc-shaped heat exchange tubes (421), and the hollow heat exchange plates (422) are used to connect the plurality of arc-shaped heat exchange tubes (421).

2. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The dust chamber (23) is in communication with the output end of the tail gas inlet pipe (11).

3. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The hollow plate (25) and the arc-shaped hollow fins (26) are both made of stainless steel sheet material.

4. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The other lower end of the three-way water injection pipe (27) is connected to the top of the inner cavity of the hollow frame (221), and the upper end of the three-way water injection pipe (27) extends to the top of the purification box (21); The other upper port of the three-way drainage pipe (28) is connected to the bottom of the inner cavity of the hollow frame (221), and the lower port of the three-way drainage pipe (28) extends to the bottom of the purification box (21).

5. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The filter cleaning mechanism (3) comprises a gear member (31) rotatably connected to the center of the top of the filter (22); a shaft (32) is fixedly mounted on one side of the gear member (31); a motor (33) is fixedly mounted on one end of the shaft (32) away from the gear member (31); a guide rail (34) is arranged below the gear member (31); a gear bar (35) meshing with the gear member (31) is slidably connected to the inner side of the guide rail (34); and a cleaning brush (36) in contact with the filter (22) is fixedly mounted on the bottom of the gear bar (35).

6. The environmentally friendly cupola for metal casting according to claim 5, characterized in that: The motor (33) is fixedly mounted on the outside of the purification box (21), and the output end of the motor (33) is fixedly connected to the shaft (32).

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