A flue gas extraction and purification machine for lost foam casting.

Abstract

This invention discloses a flue gas extraction and purification machine for lost foam casting, belonging to the field of flue gas purification technology. It includes a purification body and inlet and outlet pipes installed at the front and rear ends of the purification body. The purification body contains a filter plate and a partition plate, with a negative pressure fan fixed to the side of the partition plate. The suction force of the negative pressure fan is used to extract external flue gas. Multiple activated carbon filter modules are installed between the filter plate and the partition plate, with each activated carbon filter module arranged sequentially along the airflow direction on the purification body. This flue gas extraction and purification machine for lost foam casting can flexibly increase or decrease the number of activated carbon modules according to the exhaust gas concentration, adapting to different exhaust gas purification needs. When the exhaust gas concentration is high, the number of modules can be increased to improve the purification effect and ensure compliance with emission standards; conversely, when the exhaust gas concentration is low, the number of modules can be reduced to lower wind resistance and energy consumption, save on activated carbon usage costs, and avoid resource waste.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, specifically to a flue gas extraction and purification machine for lost foam casting. Background Technology

[0002] Lost foam casting, as an advanced precision casting process, is widely used in many fields such as machinery manufacturing, automotive parts, and construction machinery. Its core process involves using high-molecular materials such as polystyrene foam and expandable polymethyl methacrylate to create a foam model that matches the shape of the casting. After the surface of the model is coated with a refractory coating and dried, it is buried in dry sand and a negative pressure is applied. Then, molten metal at a high temperature of over 1000°C is poured in. Under the action of high temperature, the foam model rapidly vaporizes, pyrolyzes, and burns, and is eventually replaced by the molten metal. After cooling, the desired casting is formed. During the lost foam casting process, the pyrolysis of the foam model will generate a large amount of polluting fumes. In order to avoid the fumes from polluting the surrounding atmosphere, corresponding purification machines are usually used.

[0003] For example, an activated carbon adsorption device for purifying organic waste gas, as disclosed in announcement number CN216726533U, includes a base. A support plate is fixedly installed at the bottom of the base, on the right side. Rollers are installed at the bottom of the support plate. Impurities in the waste gas are filtered through the cooperation of a flow-slowing cylinder, an absorption plate, and an absorption opening, preventing impurities from clogging the activated carbon and affecting its adsorption capacity. The flow-slowing cylinder is easy to disassemble, and impurities separated from the absorption opening automatically fall into the waste collection box, making cleaning convenient and easy to use. The organic waste gas is absorbed and purified through the cooperation of a filter tube, a partition plate, and an adsorption tank. The adsorption and purification effect is improved by increasing the adsorption area of ​​the activated carbon. Impurities in the waste gas are filtered before contacting the activated carbon, preventing impurities from clogging the activated carbon.

[0004] The existing technologies mentioned above have the following technical problems: When existing waste gas purification devices are in use, the amount of activated carbon and the number of filtration stages are usually fixed and cannot be adjusted according to the concentration of waste gas. In industrial production, the concentration of waste gas will change with the production period, output and process. However, the purification intensity of traditional devices is fixed and cannot match fluctuating operating conditions. They have poor versatility. When the concentration is high, the purification capacity is insufficient and it is easy to fail to meet the standards. When the concentration is low, the activated carbon is used excessively, resulting in waste. They also have high wind resistance and high energy consumption.

[0005] Therefore, we propose a flue gas extraction and purification machine for lost foam casting to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a flue gas extraction and purification machine for lost foam casting, in order to solve the problems mentioned in the background art. Currently available waste gas purification devices on the market typically have fixed activated carbon filling amounts and filtration stages, which cannot be adjusted according to the concentration of waste gas. In industrial production, the concentration of waste gas varies with production time, output, and process. Traditional devices have fixed purification intensity, which cannot match fluctuating operating conditions, have poor versatility, insufficient purification capacity at high concentrations, and are prone to failing to meet standards. At low concentrations, excessive use of activated carbon leads to waste, high wind resistance, and high energy consumption.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a flue gas extraction and purification machine for lost foam casting, comprising a purification body and an air inlet pipe and an exhaust pipe installed at the front and rear ends of the purification body. The purification body contains a filter plate and a partition plate, and a negative pressure fan is fixed to the side of the partition plate. The suction force of the negative pressure fan is used to extract external flue gas. Multiple activated carbon filter modules are installed between the filter plate and the partition plate, and each activated carbon filter module is arranged sequentially along the airflow direction on the purification body. The sliders on the side of each activated carbon filter module are interconnected with the purification body via auxiliary springs. A power cylinder is correspondingly installed at the lower end of each activated carbon filter module. The power cylinder controls the movement of the activated carbon filter module along a direction perpendicular to the airflow. By adjusting the number of activated carbon filter modules in the airflow direction inside the purification body, the flue gas purification intensity is automatically adjusted.

[0008] Preferably, each of the activated carbon filter modules is fitted together, and an unloaded module is fixed at the top of each activated carbon filter module. Air inlet holes are provided on the sides of both the activated carbon filter module and the unloaded module.

[0009] By adopting the above technical solution, the airflow leakage between adjacent activated carbon filter modules can be avoided through the close fit between them. At the same time, the setting of the air inlet hole can facilitate the airflow to enter the interior of the unloaded module or the activated carbon filter module.

[0010] Preferably, the activated carbon filter module forms an elastic telescopic structure with an auxiliary spring and the purification body, and the external dimensions of the activated carbon filter module and the unloaded module are the same, while the interior of the unloaded module is set as a hollow structure.

[0011] By adopting the above technical solution and by setting the auxiliary spring, the activated carbon filter module can be provided with elastic support inside the purifier body. At the same time, the hollow structure inside the unloaded module can facilitate the normal flow of air.

[0012] Preferably, the activated carbon filter module is filled with activated carbon adsorption particles, and the two activated carbon filter modules at the beginning and end of the purifier body are tightly attached to the sides of the filter plate and the partition plate, respectively.

[0013] By adopting the above technical solution, the filter plate can filter particulate matter in the flue gas, and the activated carbon filter module can further adsorb harmful substances in the flue gas.

[0014] Preferably, the activated carbon filter module has two limiting plates installed inside, one above the other, and a support plate is installed on the opposite side of the two limiting plates. The surface of the support plate arches towards the center of the activated carbon filter module to form a protrusion, and multiple protrusions are evenly distributed on the support plate.

[0015] By adopting the above technical solution, the protrusion on the support plate can extend the flow time of flue gas in the activated carbon filter module, so that the harmful substances in the flue gas can be fully adsorbed by the activated carbon particles.

[0016] Preferably, the longitudinal section of the protrusion is set as a triangular structure, and the protrusions on the upper and lower support plates are staggered. The staggered protrusions make the airflow path inside the activated carbon filter module form a wave shape.

[0017] By adopting the above technical solution, the staggered distribution of the protrusions on the upper and lower support plates ensures that the airflow entering the activated carbon filter module can only flow in the gaps between the protrusions.

[0018] Preferably, a pressure block is fixed on the support plate at the bottom inside the activated carbon filter module, and the pressure block is connected to each other by a built-in spring and a limiting plate. A squeezing rod is provided on the side of the pressure block, and the squeezing rod is fixed on the side of the plug-in rod. The plug-in rod is fixed on the telescopic end of the power cylinder, and the plug-in rod is inserted into the interior of the receiving column. The receiving column is fixed on the limiting plate, and a blocking part is installed at the end of the plug-in rod inserted into the receiving column.

[0019] By adopting the above technical solution, the built-in spring can enable the pressure block and support plate to return to their original positions after moving on the limit plate, and the extension and retraction of the power cylinder can drive the plug rod to move synchronously.

[0020] Preferably, the support plate and the limiting plate are in contact with each other, and the pressure block on the support plate can slide on the limiting plate. The pressure block and the extrusion rod are in contact with each other, and the contact surfaces of the pressure block and the extrusion rod are set as inclined surfaces.

[0021] By adopting the above technical solution, when the extrusion rod moves with the insertion rod, the movement of the insertion rod can extrude force on the pressure block.

[0022] Preferably, the cross-section of the combined plug rod and the blocking part is set as a "T" shaped structure, and the interior of the receiving column is set as a hollow structure.

[0023] By adopting the above technical solution, when the blocking part at the end of the plug rod comes into contact with the interior of the receiving column, the receiving column can be pushed to move synchronously when the plug rod continues to move.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the flue gas extraction and purification machine for lost foam casting can flexibly increase or decrease the number of activated carbon modules according to the concentration of waste gas, and can adapt to the waste gas purification needs of different working conditions. It can increase the number of modules to improve the purification effect and ensure that the emission meets the standards when the waste gas concentration is high; and it can reduce the number of modules when the waste gas concentration is low, thereby reducing wind resistance and energy consumption, saving the cost of activated carbon, and avoiding resource waste. 1. By setting multiple closely fitted activated carbon filter modules inside the purifier body, and installing a power cylinder at the bottom of each activated carbon filter module, the number of activated carbon filter modules in the airflow direction inside the purifier body can be increased or decreased through the power cylinder. When the exhaust gas concentration is high, the number of activated carbon filter modules is increased to extend the adsorption path, improve the purification effect, and ensure that the emission meets the standards. When the exhaust gas concentration is low, the number of activated carbon filter modules is reduced to avoid waste of resources, while still meeting the purification requirements and maintaining the best purification efficiency at all times. 2. By setting multiple staggered protrusions inside the activated carbon filter module, the staggered protrusions make the airflow path form a wave shape. When the airflow passes through the activated carbon filter module, the wave-shaped path can prolong the contact time between the airflow and the activated carbon adsorption, so that the activated carbon particles can fully adsorb the harmful substances in the flue gas. 3. The pressing rod moves to reciprocate the pressure block, which in turn drives the support plate and protrusions to move back and forth. The reciprocating movement of the protrusions can agitate the activated carbon particles inside the activated carbon filter module without affecting the flue gas flow or requiring additional stirring or vibration components. This prevents the activated carbon from clumping, compacting, or clogging during use, keeping the activated carbon layer loose and uniform. Attached Figure Description

[0025] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a schematic diagram of the purification body and power cylinder structure of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the activated carbon filter module and auxiliary spring structure of the present invention; Figure 5 This is a schematic diagram of the partition plate and negative pressure fan structure of the present invention; Figure 6This is a schematic diagram of the structure of the unloaded module of the present invention after it has been moved downwards; Figure 7 This is a cross-sectional view of the activated carbon filter module and the unloaded module of the present invention; Figure 8 This is a schematic diagram of the limiting plate and protrusion structure of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle.

[0026] In the diagram: 1. Purifier body; 2. Inlet pipe; 3. Exhaust pipe; 4. Filter plate; 5. Divider plate; 6. Negative pressure fan; 7. Activated carbon filter module; 8. No-load module; 9. Inlet vent; 10. Auxiliary spring; 11. Power cylinder; 12. Limiting plate; 13. Support plate; 14. Protrusion; 15. Pressure block; 16. Built-in spring; 17. Extrusion rod; 18. Insertion rod; 19. Receiving column; 20. Blocking part. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-9Existing waste gas purification devices typically have fixed activated carbon filling amounts and filtration stages, which cannot be adjusted according to waste gas concentrations. In industrial production, waste gas concentrations vary with production periods, output, and processes. Traditional devices have fixed purification strengths, making them unsuitable for fluctuating operating conditions, resulting in poor versatility. At high concentrations, their purification capacity is insufficient, easily failing to meet standards; at low concentrations, excessive activated carbon is used, leading to waste, high wind resistance, and high energy consumption. To address this technical problem, this embodiment discloses the following technical content: a flue gas extraction and purification machine for lost foam casting, comprising a purification body 1 and an inlet pipe 2 and an exhaust pipe 3 installed at the front and rear ends of the purification body 1. A filter plate 4 and a partition plate 5 are installed inside the purification body 1, and a negative pressure fan 6 is fixed to the side of the partition plate 5. The suction force of the negative pressure fan 6 is used to extract external flue gas. Multiple activated carbon filter modules 7 are installed between the filter plate 4 and the partition plate 5, and each activated carbon filter module 7 is arranged sequentially along the airflow direction on the purification body 1. The sliders on the sides of the activated carbon filter module 7 are all connected to the purifier body 1 via auxiliary springs 10. A power cylinder 11 is installed at the lower end of each activated carbon filter module 7. The power cylinder 11 is used to control the activated carbon filter module 7 to move along the direction perpendicular to the airflow. By adjusting the number of activated carbon filter modules 7 in the airflow direction inside the purifier body 1, the flue gas purification intensity can be automatically adjusted. Each activated carbon filter module 7 is in close contact with each other, and an empty module 8 is fixed at the upper end of each activated carbon filter module 7. Air inlet holes 9 are opened on the sides of both the activated carbon filter module 7 and the empty module 8. The activated carbon filter module 7 forms an elastic telescopic structure with the purifier body 1 via auxiliary springs 10. The external dimensions of the activated carbon filter module 7 and the empty module 8 are the same. The interior of the empty module 8 is set as a hollow structure. The interior of the activated carbon filter module 7 is filled with activated carbon adsorption particles. The first and last activated carbon filter modules 7 inside the purifier body 1 are tightly attached to the sides of the filter plate 4 and the partition plate 5, respectively.

[0029] When flue gas purification is required, the negative pressure fan 6 is turned on. The negative pressure fan 6 generates negative pressure suction, allowing the flue gas to enter the purifier body 1 through the air inlet pipe 2. Particulate matter in the flue gas entering the purifier body 1 is first filtered by the filter screen on the filter plate 4. The filtered flue gas then enters the activated carbon filter module 7 through the air inlet 9. The activated carbon in the activated carbon filter module 7 adsorbs harmful substances in the flue gas, and the purified flue gas is finally discharged through the exhaust pipe 3. During purification, the power cylinder 11 can be turned on, pushing the activated carbon filter module 7. Each activated carbon filter module 7... The number of activated carbon filter modules 7 in the airflow direction inside the purifier body 1 can be increased or decreased by adjusting the movable adjustment mechanism. When the exhaust gas concentration is high, the number of activated carbon filter modules 7 is increased to extend the adsorption path, improve the purification effect, and ensure that the emission meets the standards. When the exhaust gas concentration is low, the number of activated carbon filter modules 7 is reduced to avoid waste of resources, while still meeting the purification requirements. It can always maintain the best purification efficiency and will not fluctuate due to changes in operating conditions. When the activated carbon filter module 7 is moved out of the airflow path, the empty module 8 on the activated carbon filter module 7 can be moved to the airflow path. The empty module 8 can fill the original position of the activated carbon filter module 7, allowing the flue gas to continue to flow along the original flow path.

[0030] In order to improve the adsorption and purification effect of harmful substances in flue gas during flue gas purification, this embodiment adopts the method of extending the flow time of flue gas in activated carbon filter module 7. The specific delay method is as follows: The activated carbon filter module 7 has two limiting plates 12 installed inside, and a support plate 13 is installed on the opposite side of the two limiting plates 12. The surface of the support plate 13 arches towards the center of the activated carbon filter module 7 to form a protrusion 14. Multiple protrusions 14 are evenly distributed on the support plate 13. The longitudinal section of the protrusion 14 is set as a triangular structure, and the protrusions 14 on the upper and lower support plates 13 are staggered. The staggered distribution of the protrusions 14 makes the airflow path inside the activated carbon filter module 7 form a wave shape.

[0031] When the flue gas enters the activated carbon filter module 7, because the activated carbon filter module 7 has multiple staggered protrusions 14 inside, the flue gas can only flow through the gaps between adjacent protrusions 14 after passing through the activated carbon filter module 7. This changes the flow path of the flue gas from a straight line to a wave shape, thereby increasing the flow time of the flue gas in the activated carbon filter module 7, allowing the harmful substances in the flue gas to be fully adsorbed by the activated carbon particles.

[0032] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. During waste gas purification, to avoid premature saturation or other idle areas caused by some activated carbon not participating in adsorption due to stagnation, this example discloses the following technical content: Figures 7-9 As shown, a pressure block 15 is fixed on the support plate 13 at the bottom of the activated carbon filter module 7. The pressure block 15 is connected to the limiting plate 12 by an internal spring 16. A pressing rod 17 is provided on the side of the pressure block 15, and the pressing rod 17 is fixed to the side of the insertion rod 18. The insertion rod 18 is fixed to the telescopic end of the power cylinder 11, and the insertion rod 18 is inserted into the interior of the receiving column 19. The receiving column 19 is fixed on the limiting plate 12, and the insertion rod 18 is inserted into the receiving column 19. Inside the column 19, a blocking part 20 is installed at one end of the column 19. The support plate 13 and the limiting plate 12 are in contact with each other, and the pressure block 15 on the support plate 13 can slide on the limiting plate 12. The pressure block 15 and the extrusion rod 17 are in contact with each other. The contact surfaces of the pressure block 15 and the extrusion rod 17 are set as inclined surfaces. The cross section of the plug rod 18 and the blocking part 20 after combination is set as a "T" shaped structure, and the interior of the column 19 is set as a hollow structure.

[0033] During flue gas purification, the power cylinder 11 can be activated, causing the insertion rod 18 to extend and retract slightly. This extension / retraction is less than the height of the internal cavity of the receiving column 19. Within this range, the insertion rod 18 will only move within the receiving column 19 and will not cause the blocking portion 20 at the end of the insertion rod 18 to push the receiving column 19 to move synchronously. When the insertion rod 18 moves, it can drive the pressing rod 17 to move synchronously. After the pressing rod 17 moves, it can use its inclined side to press the inclined side of the pressure block 15, causing the pressure block 15 to drive the support plate 13 to move on the limiting plate 12. When the power cylinder 11 retracts... The plug-in rod 18 and the side pressing rod 17 also reset synchronously. At this time, the pressure block 15 and the support plate 13 reset and rebound under the action of the built-in spring 16. This cycle repeats, which realizes the reciprocating movement of the lower support plate 13 and the protrusion 14 inside the activated carbon filter module 7. The reciprocating movement of the protrusion 14 can turn over the activated carbon particles inside the activated carbon filter module 7 without affecting the flue gas flow or setting additional stirring or knocking vibration components. This prevents the activated carbon from clumping, compacting, or blocking during use, keeps the activated carbon layer in a loose and uniform state, and improves the contact area and contact uniformity between the flue gas and the activated carbon.

[0034] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flue gas extraction and purification machine for lost foam casting, comprising a purification body (1) and an air inlet pipe (2) and an exhaust pipe (3) installed at the front and rear ends of the purification body (1), wherein a filter plate (4) and a partition plate (5) are installed inside the purification body (1), and a negative pressure fan (6) is fixed to the side of the partition plate (5), the suction force of the negative pressure fan (6) is used to extract external flue gas, characterized in that: Multiple activated carbon filter modules (7) are installed between the filter plate (4) and the partition plate (5), and each activated carbon filter module (7) is arranged sequentially along the airflow direction on the purifier body (1). The sliders on the side of each activated carbon filter module (7) are connected to the purifier body (1) through an auxiliary spring (10). A power cylinder (11) is installed at the lower end of each activated carbon filter module (7). The power cylinder (11) is used to control the activated carbon filter module (7) to move along the direction perpendicular to the airflow. By adjusting the number of activated carbon filter modules (7) in the airflow direction inside the purifier body (1), the flue gas purification intensity can be automatically adjusted. The interior of the activated carbon filter module (7) is filled with activated carbon adsorption particles. The activated carbon filter module (7) is equipped with two upper and lower limiting plates (12), and a support plate (13) is installed on the opposite side of the two limiting plates (12). The surface of the support plate (13) arches towards the center of the activated carbon filter module (7) to form a protrusion (14). Multiple protrusions (14) are evenly distributed on the support plate (13). A pressure block (15) is fixed on the support plate (13) at the bottom of the activated carbon filter module (7), and the pressure block (15) is connected to each other by a built-in spring (16) and a limiting plate (12). A squeezing rod (17) is provided on the side of the pressure block (15), and the squeezing rod (17) is fixed on the side of the plug rod (18). The plug rod (18) is fixed on the telescopic end of the power cylinder (11), and the plug rod (18) is inserted into the interior of the receiving column (19). The receiving column (19) is fixed on the limiting plate (12). A blocking part (20) is installed at the end of the plug rod (18) inserted into the interior of the receiving column (19). The support plate (13) and the limiting plate (12) are in contact with each other, and the pressure block (15) on the support plate (13) can slide on the limiting plate (12). The pressure block (15) and the extrusion rod (17) are in contact with each other, and the contact surface of the pressure block (15) and the extrusion rod (17) is set as an inclined surface.

2. The flue gas extraction and purification machine for lost foam casting as described in claim 1, characterized in that: Each of the activated carbon filter modules (7) is attached to each other, and an empty module (8) is fixed at the upper end of each activated carbon filter module (7). An air inlet hole (9) is opened on the side of both the activated carbon filter module (7) and the empty module (8).

3. The flue gas extraction and purification machine for lost foam casting according to claim 2, characterized in that: The activated carbon filter module (7) forms an elastic telescopic structure through the auxiliary spring (10) and the purification body (1), and the external dimensions of the activated carbon filter module (7) and the unloaded module (8) are the same, and the interior of the unloaded module (8) is set as a hollow structure.

4. The flue gas extraction and purification machine for lost foam casting as described in claim 1, characterized in that: The two activated carbon filter modules (7) inside the purification body (1) are tightly attached to the sides of the filter plate (4) and the partition plate (5), respectively.

5. The flue gas extraction and purification machine for lost foam casting according to claim 1, characterized in that: The longitudinal section of the protrusion (14) is set as a triangular structure, and the protrusions (14) on the upper and lower support plates (13) are staggered. The staggered protrusions (14) make the airflow path inside the activated carbon filter module (7) form a wave shape.

6. The flue gas extraction and purification machine for lost foam casting according to claim 1, characterized in that: The cross-section of the combined plug rod (18) and the blocking part (20) is set as a "T" shaped structure, and the interior of the receiving column (19) is set as a hollow structure.

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