Dust removal device for exhaust pipeline of rare earth vacuum melting furnace

Abstract

A dust removal device for an air exhaust pipeline of a rare earth vacuum smelting furnace is mainly applied to the field of vacuum calcium heat reduction smelting of rare earth metal and comprises a furnace body, a dust filtering device and an air exhaust device. The dust filtering device comprises a filtering device shell, a filtering net with holes, a sealing baffle, a filtering medium and a quick-connection buckle; the filter device shell is in a circular truncated cone shape, the lower bottom face is large, the upper bottom face is small, the sealing baffle is spliced with the filter screen with the holes, the quick-connection buckles are arranged on the lower bottom face of the filter device shell, the sealing baffle and the filter screen with the holes are fixed to the filter device shell through the quick-connection buckles on the lower bottom face of the filter device shell, and the quick-connection buckles are arranged on the upper bottom face of the filter device shell. The sealing baffle and the filter screen with the holes are welded to the filter device shell, and the dust filter device is filled with the filter medium. The air exhaust pipeline does not need to be detached in the filter medium replacement process, the sealing performance of equipment is not affected, and operation is easy and convenient; and the filtering medium material is low in cost and can be repeatedly used.

Description

Technical Field

[0001] The utility model is mainly used in the field of vacuum calcium thermal reduction smelting of rare earth metals, and particularly relates to a dust removal device for an exhaust pipe of a vacuum smelting furnace. Background Art

[0002] In the process of thermal reduction of rare earth metals, high melting point metal crucibles are used as containers for the reduction reaction and refining and impurity removal processes. They need to be turned into liquid during smelting, so the reaction temperature is very high, basically reaching about 1600 degrees. The boiling point of metallic calcium is relatively low, only 1484 degrees. In addition, the semi-vacuum state of the smelting process makes metallic calcium very volatile. Therefore, the feeding ratio is generally excessive in metallic calcium. Then the calcium vapor evaporates and runs everywhere, and then condenses down. There are dust on the inner wall of the furnace, the furnace cover, and the exhaust pipe. During the exhaust process of the next furnace, the dust in the pipe will be pumped into the vacuum system (without a filter device), especially in the refining and decalcification stage. In order to achieve a higher vacuum degree for decalcification, the valve is in an open state, and the volatilized calcium vapor will be directly pumped into the vacuum pump (without a filter device). Over time, the rotation resistance of the Roots pump increases, and the oil in the first-stage pump is all contaminated by dust, turning into mud, seriously affecting the use effect.

[0003] Currently, a common method involves installing a dust filter between the furnace and the pump. This device consists of an iron cylinder with a filter element inside. Dust-carrying gas passes through the filter element, where it is filtered. The purified gas is then discharged to the atmosphere via a vacuum pump. The filter element, which is contaminated with dust, is then periodically removed and cleaned. However, cleaning the filter element is a complex process. First, the iron cylinder surrounding the filter element must be opened to remove the element. The element must then be blown clean with compressed air to remove the dust inside. Finally, the element must be replaced. This cleaning process involves disassembling the vacuum seal. If the seal is not properly sealed, it can easily cause equipment leaks, requiring specialized labor and labor costs. Furthermore, blowing dust out of the filter element with compressed air can easily create dust, which has significant environmental impacts. Furthermore, once the filter element is contaminated with dust, its extraction efficiency is significantly reduced. Operators may mistakenly believe that the vacuum pump is not delivering enough air or that the equipment is leaking, which can lead to misjudgment by maintenance personnel.

[0004] Therefore, a new dust removal device for exhaust pipes is needed to solve the above technical problems existing in the prior art. Summary of the Invention

[0005] The specific technical solutions of the present utility model are as follows.

[0006] A dust removal device for an exhaust pipe of a rare earth vacuum smelting furnace comprises a furnace body 1, a dust filter device 2 and an exhaust device; the dust filter device 2 comprises a filter device housing 9, a porous filter screen 6, a sealing baffle 7, a filter medium 8 and a quick-connect buckle 10; the filter device housing 9 is truncated cone-shaped with a large lower bottom surface and a small upper bottom surface; the sealing baffle 7 is spliced ​​with the porous filter screen 6; the quick-connect buckle 10 is arranged on the lower bottom surface of the filter device housing 9; on the lower bottom surface of the filter device housing 9, the sealing baffle 7 and the porous filter screen 6 are fixed to the filter device housing 9 by the quick-connect buckle 10; on the upper bottom surface of the filter device housing 9, the sealing baffle 7 and the porous filter screen 6 are welded to the filter device housing 9; the porous filter screen 6 on the upper and lower bottom surfaces of the filter device housing 9 is flush in height; the filter medium 8 is filled inside the dust filter device 2.

[0007] Furthermore, the exhaust device includes an exhaust pipe 3, a vacuum pump 4, and a pump exhaust port 5. The vacuum pump 4 is connected to the furnace body 1 through the exhaust pipe 3, and the pump exhaust port 5 is installed above the vacuum pump 4. The purified air enters the vacuum pump 4 through the exhaust pipe 3 and is then discharged into the atmosphere through the pump exhaust port 5.

[0008] Furthermore, the dust filtering device 2 is installed at the connection between the exhaust pipe 3 and the furnace body 1, with the upper bottom surface of the dust filtering device 2 facing the air outlet direction and the lower bottom surface facing the air intake direction.

[0009] Furthermore, the outer diameter of the middle part of the dust filtering device 2 is consistent with the inner diameter of the exhaust pipe 3, so that dust cannot pass through the gap between the dust filtering device 2 and the exhaust pipe 3, ensuring that all dust is filtered by the dust filtering device 2.

[0010] Furthermore, the filling height of the filter medium 8 is higher than that of the porous filter screen 6, but not fully filled, so as to ensure that all dust is filtered by the filter medium 8 and air can pass through smoothly.

[0011] Furthermore, the filter medium 8 is a combination of one or more of sand, steel sand, and activated carbon, which is low in cost and reusable.

[0012] The utility model provides a dust removal device for the exhaust pipe of a rare earth vacuum smelting furnace. When in operation, the dust filter device 2 is integrally embedded in the connection between the exhaust pipe 3 and the furnace body 1, with the upper bottom surface of the dust filter device 2 facing the exhaust direction and the lower bottom surface facing the intake direction. Since the outer diameter of the middle part of the dust filter device 2 is consistent with the inner diameter of the exhaust pipe 3, dust cannot pass through the gap between the dust filter device 2 and the exhaust pipe 3, ensuring that all dust is filtered by the dust filter device. Turn on the furnace table 1 to work, and turn on the vacuum pump 4 to exhaust air at the same time. During exhaust, the air in the furnace body 1 carries dust through the porous filter screen 6 and enters the dust filter device 2. Since the filling height of the filter medium 8 is higher than the porous filter screen 6, it is ensured that all dust is filtered by the filter medium 8. The purified air enters the vacuum pump 4 through the exhaust pipe 2, and is then discharged into the atmosphere through the pump exhaust port 5. After the dust filter device 2 has been used for one to two weeks, the furnace operator can directly pull out the dust filter device 2, then open the quick-connect buckle 10, pour out all the filter medium 8, and after replacing the clean filter medium 8, close the quick-connect buckle 10, and then put the dust filter device 2 back into the exhaust pipe 3, and then proceed to the next round of production.

[0013] The utility model has the following beneficial technical effects:

[0014] 1. The replacement process of the filter medium does not require the removal of the exhaust pipe, does not affect the sealing of the equipment, and only requires one furnace operator to complete it. The operation is simple and convenient.

[0015] 2. The filter medium is a combination of one or more of sand, steel grit, and activated carbon, which has low material cost and can be reused after washing and drying. This has a significant cost advantage over existing filter cartridges.

[0016] 3. After each shift, the operator can take out the dust filter device and shake it up and down and left and right a few times. Some of the dust collected in the dust filter device can also fall out. This can extend the time for replacing the filter medium and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the dust filtering device of the present utility model.

[0019] Reference numerals:

[0020] 1-furnace body, 2-dust filter device, 3-exhaust pipe, 4-vacuum pump, 5-pump exhaust port, 6-perforated filter screen, 7-sealing baffle, 8-filter medium, 9-filter device housing, 10-quick-connect buckle. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, quantity, or position.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] Example

[0025] A dust removal device for an exhaust pipe of a rare earth vacuum smelting furnace comprises a furnace body 1, a dust filter device 2 and an exhaust device; the dust filter device 2 comprises a filter device housing 9, a porous filter screen 6, a sealing baffle 7, a filter medium 8 and a quick-connect buckle 10; the filter device housing 9 is truncated cone-shaped with a large lower bottom surface and a small upper bottom surface; the sealing baffle 7 is spliced ​​with the porous filter screen 6; the quick-connect buckle 10 is arranged on the lower bottom surface of the filter device housing 9; on the lower bottom surface of the filter device housing 9, the sealing baffle 7 and the porous filter screen 6 are fixed to the filter device housing 9 by the quick-connect buckle 10; on the upper bottom surface of the filter device housing 9, the sealing baffle 7 and the porous filter screen 6 are welded to the filter device housing 9; the porous filter screen 6 on the upper and lower bottom surfaces of the filter device housing 9 is flush in height; the filter medium 8 is filled inside the dust filter device 2.

[0026] The exhaust device includes an exhaust pipe 3, a vacuum pump 4, and a pump exhaust port 5. The vacuum pump 4 is connected to the furnace body 1 through the exhaust pipe 3. The pump exhaust port 5 is installed above the vacuum pump 4. The purified air enters the vacuum pump 4 through the exhaust pipe 3 and is then discharged into the atmosphere through the pump exhaust port 5.

[0027] The dust filter 2 is installed at the junction of the exhaust duct 3 and the furnace body 1, with its upper bottom facing the exhaust direction and its lower bottom facing the intake direction. The outer diameter of the middle portion of the dust filter 2 is consistent with the inner diameter of the exhaust duct 3, preventing dust from passing through the gap between the dust filter 2 and the exhaust duct 3, ensuring that all dust is filtered by the dust filter 2.

[0028] Filter medium 8 is filled higher than the perforated filter screen 6, but not completely filled, ensuring that all dust is filtered by filter medium 8 and that air can pass through smoothly. Filter medium 8 is a combination of one or more of sand, steel grit, and activated carbon, making it very cost-effective and reusable after use by washing and drying. Replacing filter medium 8 does not require disassembly of the exhaust duct 3, nor does it affect the sealing of the equipment.

[0029] The working process of the present utility model is as follows: when working, the dust filter device 2 is integrally embedded into the connection between the exhaust pipe 3 and the furnace body 1, with the upper bottom surface of the dust filter device 2 facing the exhaust direction and the lower bottom surface facing the intake direction. Since the outer diameter of the middle part of the dust filter device 2 is consistent with the inner diameter of the exhaust pipe 3, dust cannot pass through the gap between the dust filter device 2 and the exhaust pipe 3, ensuring that all dust is filtered by the dust filter device. Turn on the furnace table 1 to work, and turn on the vacuum pump 4 to exhaust air at the same time. When exhausting, the air in the furnace body 1 carries the dust through the porous filter screen 6 and enters the dust filter device 2. Since the filling height of the filter medium 8 is higher than the porous filter screen 6, it is ensured that all dust is filtered by the filter medium 8. The purified air enters the vacuum pump 4 through the exhaust pipe 2, and is then discharged into the atmosphere through the pump exhaust port 5. After the dust filter device 2 has been used for one to two weeks, the furnace operator can directly pull out the dust filter device 2, then open the quick-connect buckle 10, pour out all the filter medium 8, and after replacing the clean filter medium 8, close the quick-connect buckle 10, and then put the dust filter device 2 back into the exhaust pipe 3, and then proceed to the next round of production.

[0030] After each shift, the operator can take out the dust filter device 2 and shake it up and down and left and right a few times. Some of the dust collected in the dust filter device 2 can also fall out. This can extend the time for replacing the filter medium 8 and improve production efficiency.

[0031] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A dust removal device for the exhaust pipe of a rare earth vacuum smelting furnace, characterized in that: The invention comprises a furnace body (1), a dust filter device (2) and an exhaust device; the dust filter device (2) comprises a filter device housing (9), a filter screen with holes (6), a sealing baffle (7), a filter medium (8) and a quick-connect buckle (10); the filter device housing (9) is in a truncated cone shape, with a large lower bottom surface and a small upper bottom surface; the sealing baffle (7) and the filter screen with holes (6) are spliced ​​together; the quick-connect buckle (10) is arranged on the lower bottom surface of the filter device housing (9); on the lower bottom surface of the filter device housing (9), the sealing baffle (7) and the filter screen with holes (6) are fixed to the filter device housing (9) through the quick-connect buckle (10); on the upper bottom surface of the filter device housing (9), the sealing baffle (7) and the filter screen with holes (6) are welded to the filter device housing (9); the filter screen with holes (6) on the upper and lower bottom surfaces of the filter device housing (9) are flush with each other; and the filter medium (8) is filled in the dust filter device (2).

2. A dust removal device for an exhaust pipe of a rare earth vacuum melting furnace according to claim 1, characterized in that: The exhaust device comprises an exhaust pipe (3), a vacuum pump (4), and a pump exhaust port (5); the vacuum pump (4) is connected to the furnace body (1) via the exhaust pipe (3); and the pump exhaust port (5) is installed above the vacuum pump (4).

3. A dust removal device for an exhaust pipe of a rare earth vacuum melting furnace according to claim 2, characterized in that: The dust filter device (2) is installed at the connection between the exhaust pipe (3) and the furnace body (1), with the upper bottom surface of the dust filter device (2) facing the air outlet direction and the lower bottom surface facing the air intake direction.

4. A dust removal device for an exhaust pipe of a rare earth vacuum melting furnace according to claim 3, characterized in that: The outer diameter of the middle portion of the dust filtering device (2) is consistent with the inner diameter of the exhaust pipe (3).

5. The dust removal device for the exhaust pipe of a rare earth vacuum melting furnace according to claim 1, characterized in that: The filling height of the filter medium (8) is higher than that of the porous filter screen (6).

6. The dust removal device for the exhaust pipe of a rare earth vacuum melting furnace according to claim 1, characterized in that: The filter medium (8) is a combination of one or more of sand, steel sand and activated carbon.

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