Exhaust gas purification apparatus and purification method for casting of a gearbox housing

Abstract

The present application relates to the technical fields of casting waste gas purification, in particular to a waste gas purification equipment and purification method for gearbox shell casting, which comprises a collecting box, and an air extraction pipe is communicated with the collecting box, and further comprises a cooling mechanism arranged in the air extraction pipe for cooling the waste gas, wherein the cooling mechanism comprises a cold air fan installed on the collecting box, and the waste gas can be cooled by blowing cold air into the air extraction pipe through the cold air pipe when the waste gas is purified, the telescopic end of the telescopic rod A can adjust the telescopic length according to the temperature of the waste gas, the amount of cold air blown into the air extraction pipe can be adjusted according to the temperature of the waste gas, and the filter bag can be heated by the heating mechanism to prevent water vapor in the waste gas from condensing on the filter bag when the waste gas passes through the filter bag.

Description

Technical Field

[0001] This invention relates to the field of casting exhaust gas purification technology, and in particular to an exhaust gas purification device and method for casting gearbox housings. Background Technology

[0002] The materials used in the manufacture of cast gearbox housings are of high quality, generally using alloys such as iron or aluminum, which have high strength and rigidity, making them able to withstand external vibrations and heavy loads, and ensuring the normal operation of the equipment.

[0003] During the casting process, the high-temperature waste gas usually contains a certain amount of water vapor. Current waste gas purification equipment typically uses bag filters to purify the waste gas. When the high-temperature waste gas containing water vapor comes into contact with the bag filter, the waste gas temperature drops rapidly. The water vapor in the waste gas cools down to the condensation temperature and adheres to the surface of the bag filter to form condensate. Subsequently, the fine dust in the waste gas comes into contact with the condensate to form a viscous mud-like substance, which blocks the gaps in the bag filter. The air permeability of the bag filter drops sharply, resulting in a serious lack of ventilation capacity of the waste gas purification equipment. It cannot effectively collect smoke and dust. After long-term use, the dust in the mud dries on the bag filter, causing the bag filter to completely lose its filtering function and a series of other consequences. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an exhaust gas purification device and purification method for gearbox housing casting.

[0005] The technical solution of the present invention is: a waste gas purification device for gearbox housing casting, comprising a collection box, an exhaust pipe connected to the collection box, and further comprising: The cooling mechanism, located inside the exhaust duct, is used to cool the exhaust gas. The cooling mechanism includes: Air cooler, the air cooler is installed on the collection box; The air conditioning duct runs through the exhaust duct and connects to the output end of the air cooler. Filter bag, the filter bag is installed inside the exhaust duct; Mounting bracket, which is fixedly fitted onto the outer wall of the air conditioning pipe; Telescopic rod A is fixedly installed on the mounting bracket. Adjustment plate A is vertically inserted and slidably installed on the air conditioning pipe, and is fixedly installed to the telescopic end of telescopic rod A; The heating mechanism is located inside the exhaust duct and is used to heat the filter bag.

[0006] Furthermore, the heating mechanism includes a hot air blower installed on the collection box, the output end of the hot air blower is connected to an air supply pipe, an irregular groove is opened through the exhaust pipe, a heating pipe is slidably installed through the irregular groove in the vertical direction, and a flexible hose is connected between the air supply pipe and the heating pipe.

[0007] Furthermore, the heating mechanism also includes an adjusting plate B that runs vertically through and is slidably mounted on the gas pipeline.

[0008] Furthermore, the heating mechanism also includes an impeller rotatably installed inside the air duct, a support frame fixedly installed on the exhaust duct, a sleeve fixedly installed on the support frame, the impeller shaft rotatably passes through the air duct and the support frame, and is coaxially fixedly connected with the fan blade located inside the sleeve, and a circular plate is slidably installed in the sleeve along the vertical direction.

[0009] Furthermore, a telescopic rod B is fixedly installed on the circular plate via a support plate, and an L-shaped frame is fixedly installed between the telescopic end of the telescopic rod B and the adjusting plate B.

[0010] Furthermore, a sleeve is slidably fitted onto the outer wall of the exhaust pipe, and the sleeve is fixedly fitted onto the heating pipe.

[0011] Furthermore, a hydraulic cylinder is installed on the support frame, a sensor electrically connected to the hydraulic cylinder is installed inside the collection box, and a U-shaped frame that abuts against the piston end of the hydraulic cylinder is fixedly installed on the outer wall of the sleeve.

[0012] Furthermore, a U-shaped rod is slidably connected to the support frame in the horizontal direction, and a spring connects the support frame and the U-shaped rod. The U-shaped rod works in conjunction with the U-shaped frame.

[0013] Furthermore, a cross plate that mates with the tangential rod is fixedly fitted onto the piston end of the hydraulic cylinder.

[0014] A purification method for an exhaust gas purification device used in gearbox housing casting, applicable to the aforementioned exhaust gas purification device for gearbox housing casting, includes the following steps: S1: Controls the cold air blower to output cold air and controls the hot air blower to output hot air. The cold air is blown into the exhaust pipe through the cold air pipe to cool the exhaust gas. The impeller rotates due to the impact of the cold air, which in turn increases the gap between the regulating plate B and the inner wall of the air supply pipe, causing the filter bag to heat up. S2: The gas inside the telescopic rod B is affected by the temperature inside the factory, causing the telescopic end of the telescopic rod B to extend or retract. This allows for further adjustment of the gap between the regulating plate B and the inner wall of the gas pipeline according to the temperature inside the factory, preventing the filter bag from aging due to excessive temperature and ensuring that the filter bag can be heated in time. S3: The sensor controls the piston end of the hydraulic cylinder to contract due to the high temperature of the exhaust gas, which in turn causes the heating tube to descend to the lower side of the filter bag, ensuring that the exhaust gas can pass through the filter bag effectively.

[0015] The beneficial effects of this invention are: 1. This invention, by setting up a cooling mechanism, blows cold air into the exhaust pipe through a cold air pipe during exhaust gas purification, thereby cooling the exhaust gas. The high temperature of the exhaust gas affects the gas in the telescopic rod A, causing the telescopic end of the telescopic rod A to adjust its extension length according to the temperature of the exhaust gas, thus adjusting the amount of cold air blown into the exhaust pipe according to the temperature of the exhaust gas. By setting up a heating mechanism to heat the filter bag, it can prevent water vapor in the exhaust gas from condensing on the filter bag when the exhaust gas passes through the filter bag.

[0016] 2. By setting an adjustment plate B and a telescopic rod B, the position of the adjustment plate B can be adjusted according to the temperature inside the factory. When the temperature inside the factory is high, it can prevent the filter bag from being heated too much by the heat from the heating pipe, which would cause the filter bag material to age. When the temperature inside the factory is low, it increases the amount of hot air entering the heating pipe, and the filter bag heats up rapidly under the action of the heating pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cooling mechanism in this invention; Figure 3 This is a schematic diagram of the installation of the adjustment plate at point A in this invention; Figure 4 This is a schematic diagram of the installation of the gas pipeline in this invention; Figure 5 This is a schematic diagram of the heating tube structure in this invention; Figure 6 This is a schematic diagram of the cooling mechanism in this invention; Figure 7 This is a schematic diagram of the installation of the heating tube in this invention; Figure 8 This is a schematic diagram of the installation at the U-shaped frame of the present invention; Figure 9 This is a schematic diagram of the installation of the horizontal plate in this invention.

[0018] Component names and serial numbers in the diagram: 1. Collection box; 101. Exhaust pipe; 201. Air cooler; 202. Air cooling pipe; 203. Filter bag; 204. Mounting bracket; 205. Telescopic rod A; 206. Adjusting plate A; 301. Hot air blower; 302. Air supply pipe; 303. Heating pipe; 401. Adjusting plate B; 501. Impeller; 502. Support frame; 5021. Sleeve; 503. Fan blade; 504. Circular plate; 601. Telescopic rod B; 602. L-shaped frame; 701. Sleeve; 801. Hydraulic cylinder; 802. Sensor; 803. U-shaped frame; 901. C-shaped rod; 1001. Horizontal plate; 100. Negative pressure pump. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] An exhaust gas purification device for gearbox housing casting, such as Figures 1-3 As shown, the system includes a collection box 1, with an exhaust pipe 101 connected to the top of the collection box 1. A negative pressure pump 100 is installed inside the exhaust pipe 101. The system also includes a cooling mechanism installed inside the exhaust pipe 101 for cooling the exhaust gas. The cooling mechanism includes a cooler 201 installed on the collection box 1. A cooler duct 202 is installed through the exhaust pipe 101 and is connected to the output end of the cooler duct 201. A filter bag 203 is installed inside the exhaust pipe 101. A mounting bracket 204 located inside the exhaust pipe 101 is fixedly fitted on the outer wall of the cooler duct 202. A telescopic rod A205 is fixedly installed on the top of the mounting bracket 204. An adjusting plate A206 driven by the telescopic rod A205 is slidably installed through the cooler duct 202 in a vertical direction. A heating mechanism for heating the filter bag 203 is provided inside the exhaust pipe 101.

[0021] like Figures 4-8 As shown, the heating mechanism includes a hot air blower 301 installed on the top of the collection box 1. The output end of the hot air blower 301 is connected to an air supply pipe 302. A shaped groove is opened through the upper part of the exhaust pipe 101. A heating pipe 303 is slidably installed through the shaped groove in the vertical direction. The heating pipe 303 heats the filter bag 203. A flexible hose is connected between the air supply pipe 302 and the heating pipe 303.

[0022] like Figure 7 As shown, the heating mechanism also includes an adjustment plate B401 that runs vertically through and slides on the gas pipe 302. By changing the position of the adjustment plate B401, the flow rate of hot gas in the gas pipe 302 can be changed.

[0023] like Figure 7 As shown, the heating mechanism also includes an impeller 501 rotatably installed inside the cold air pipe 202. The cold air inside the cold air pipe 202 can impact the impeller 501, causing the impeller 501 to rotate. A support frame 502 is fixedly installed on the exhaust pipe 101, and a sleeve 5021 is fixedly installed on the support frame 502. The axle of the impeller 501 rotates through the cold air pipe 202 and the support frame 502, and is coaxially fixedly connected to the fan blade 503 located inside the sleeve 5021. A circular plate 504 is slidably installed in the sleeve 5021 along the vertical direction. When the fan blade 503 rotates, the circular plate 504 is lifted and slid.

[0024] like Figure 7 As shown, a telescopic rod B601 is fixedly installed on the top of the circular plate 504 via a support plate. The inner cavities of both the telescopic rod A205 and the telescopic rod B601 are filled with thermal expansion gas. An L-shaped frame 602 is fixedly installed between the telescopic end of the telescopic rod B601 and the adjusting plate B401.

[0025] like Figure 8 As shown, a sleeve 701 is slidably fitted on the outer wall of the exhaust pipe 101. The sleeve 701 is fixedly fitted on the heating pipe 303. The sleeve 701 is used to prevent exhaust gas from escaping through the irregular groove of the exhaust pipe 101.

[0026] like Figure 2 and Figure 8 As shown, a hydraulic cylinder 801 is installed on the top of the support frame 502, and a sensor 802 electrically connected to the hydraulic cylinder 801 is installed inside the collection box 1. After the sensor 802 detects the high temperature of the exhaust gas, it controls the piston end of the hydraulic cylinder 801 to retract. A U-shaped frame 803 that abuts against the piston end of the hydraulic cylinder 801 is fixedly installed on the outer wall of the sleeve 701.

[0027] like Figure 8 and Figure 9 As shown, a C-shaped rod 901 is slidably connected to the support frame 502 in the horizontal direction. A spring is connected between the support frame 502 and the C-shaped rod 901. The C-shaped rod 901 is used in conjunction with the U-shaped frame 803 and is used to limit the movement of the U-shaped frame 803.

[0028] like Figure 9 As shown, a horizontal plate 1001 that cooperates with the U-shaped rod 901 is fixedly mounted on the piston end of the hydraulic cylinder 801. When the horizontal plate 1001 contacts the U-shaped rod 901, the U-shaped rod 901 is disengaged from the U-shaped frame 803.

[0029] Initially, the telescopic end of telescopic rod A205 is in the retracted state, there is a gap between adjusting plate A206 and the inner wall of cold air pipe 202, the telescopic end of telescopic rod B601 is in the extended state, there is a gap between adjusting plate B401 and the inner wall of air supply pipe 302, the piston end of hydraulic cylinder 801 is in the extended state, the piston end of hydraulic cylinder 801 abuts against the bottom of U-shaped frame 803, the bottom of U-shaped frame 803 abuts against the top of U-shaped rod 901, and heating pipe 303 is wrapped around filter bag 203. During casting operation, the collection box 1 is moved directly above the casting equipment, and the cold air blower is controlled first. Unit 201 outputs cold air and controls the hot air blower 301 to output hot air. The cold air is blown into the exhaust pipe 101 through the cold air pipe 202 to facilitate subsequent cooling of the exhaust gas. The cold air in the cold air pipe 202 impacts the impeller 501, causing the impeller 501 to rotate and drive the fan blades 503 to rotate. The rotation of the fan blades 503 generates an upward airflow that impacts the circular plate 504. The circular plate 504, under the force, drives the adjusting plate B401 to rise through the support rod, telescopic rod B601, and L-shaped frame 602, thereby increasing the gap between the adjusting plate B401 and the inner wall of the air supply pipe 302. This increases the flow rate of hot air in the air supply pipe 302, allowing the hot air to pass through... The gas enters the heating pipe 303 through the gas supply pipe 302 and the hose. The heating pipe 303 heats up instantly under the action of hot gas, and heats the filter bag 203, raising its temperature. After the casting process generates waste gas, the negative pressure pump 100 in the exhaust pipe 101 is activated, creating a negative pressure in the collection box 1. Under the action of the negative pressure, the waste gas enters the collection box 1 and the exhaust pipe 101. When the waste gas passes through the telescopic rod A205, the high temperature of the waste gas affects the gas inside the telescopic rod A205, causing the gas inside the telescopic rod A205 to expand. The telescopic end of the telescopic rod A205 extends, driving the adjusting plate A206. The lifting and sliding mechanism increases the gap between the adjusting plate A206 and the inner wall of the cooling pipe 202, thereby increasing the flow rate of cold air in the cooling pipe 202. When the exhaust gas passes through the cooling pipe 202, it is cooled down by the temperature of the cooling pipe 202 and the cold air blown into the exhaust pipe 101. It is worth noting that the higher the temperature of the exhaust gas, the greater the expansion of the gas in the inner cavity of the telescopic rod A205, which in turn increases the flow rate of cold air in the cooling pipe 202. This achieves adaptive adjustment of the flow rate of cold air in the cooling pipe 202 according to the temperature of the exhaust gas, preventing the temperature of the exhaust gas from becoming too high when it passes through the filter bag 203, which would cause the filter bag 203 to age.

[0030] As a further supplement, the greater the flow rate of cold air in the cold air pipe 202, the higher the rotation speed of the impeller 501, and the greater the impact force of the upward airflow generated by the rotation of the fan blade 503 on the circular plate 504. Consequently, the gap between the regulating plate B401 and the inner wall of the air supply pipe 302 becomes larger, the flow rate of hot air in the air supply pipe 302 increases, and the heating rate of the filter bag 203 accelerates. When the entire equipment is not in operation, the gas inside the telescopic rod B601 is affected by the temperature inside the plant. When the temperature inside the plant is high, the temperature of the filter bag 203 is also high due to the temperature. The gas inside the telescopic rod B601 expands due to the high temperature, causing the telescopic end of the telescopic rod B601 to extend downwards. This causes the L-shaped frame 602 to lower the regulating plate B401, reducing the initial gap between the regulating plate B401 and the inner wall of the air supply pipe 302. After the airflow generated by the rotation of the fan blade 503 raises the regulating plate B401, the gap between the regulating plate B401 and the air supply pipe 302 decreases. The small gap between the inner walls of pipe 302 reduces the amount of hot air entering the heating pipe 303, preventing the filter bag 203 from overheating and causing material aging and shortening its service life. When the temperature inside the factory is low, the filter bag 203 is also at a low temperature. The gas inside the telescopic rod B601 contracts due to the low temperature, causing the telescopic end of the telescopic rod B601 to contract upwards. This causes the L-shaped frame 602 to lift the adjusting plate B401, increasing the initial gap between the adjusting plate B401 and the inner wall of the gas pipe 302. The airflow generated by the fan blade 503 further increases the gap between the adjusting plate B401 and the inner wall of the gas pipe 302, thereby increasing the amount of hot air entering the heating pipe 303. This allows the filter bag 203 to heat up rapidly under the action of the heating pipe 303, ensuring that the filter bag 203 is fully heated before the exhaust gas passes through it.

[0031] When exhaust gas enters the collection box 1, sensor 802, affected by the high temperature of the exhaust gas, triggers the piston end of control hydraulic cylinder 801 to retract. The piston end of hydraulic cylinder 801 drives the horizontal plate 1001 to descend. At this time, since the top of the U-shaped rod 901 abuts against the bottom of the U-shaped frame 803, the U-shaped frame 803 is limited to keep the heating tube 303 and the sleeve 701 at a stable height. The heating tube 303 still wraps around the outside of the filter bag 203 to ensure the heating effect on the filter bag 203. After the horizontal plate 1001 descends, it contacts and presses against the lower inclined surface of the U-shaped rod 901. The force on the U-shaped rod 901 causes the spring to extend elastically to the right and disengage from the U-shaped frame 803. The U-shaped frame 803 is released from its restraint, allowing the sleeve 701 to move. The heating tube 303 and the sleeve 701 slide downward under their own weight. The sleeve 701 drives the U-shaped rod 901 to move downward. The frame 803 descends until the bottom end of the heating tube 303 abuts against the bottom of the irregular groove of the exhaust pipe 101, and the U-shaped frame 803 abuts against the piston end of the hydraulic cylinder 801. At this time, the heating tube 303 descends to the underside of the filter bag 203 to prevent the exhaust gas from being blocked by the heating tube 303 when it passes through the filter bag 203. Subsequently, the exhaust gas comes into contact with the filter bag 203 and passes through the filter bag 203. The filter bag 203 filters the fine dust in the exhaust gas. Since the filter bag 203 has been heated at this time, the water vapor in the exhaust gas will not adhere to the filter bag 203. The water vapor in the exhaust gas will not cool down and come into contact with the dust to form a sticky mud-like substance that blocks the gaps of the filter bag, which can effectively ensure the air permeability of the filter bag 203 and the exhaust pipe 101 can maintain a stable negative pressure.

[0032] After the exhaust gas purification process is completed, the cold air blower 201 stops outputting cold air, and the hot air blower 301 stops outputting hot air. The impeller 501, no longer impacted by the cold air, stops rotating, causing the fan blades 503 to stop rotating. The fan blades 503 no longer generate upward airflow. The circular plate 504 descends to its reset position under its own weight, and through the support rod, telescopic rod B601, and L-shaped frame 602, it drives the adjusting plate B401 to descend and reset. The telescopic rod A205 and sensor 802 are no longer affected by the high temperature of the exhaust gas. The gas inside the telescopic rod A205 contracts, and the telescopic end of the telescopic rod A205 retracts and resets, driving the adjusting plate A206 to descend and reset. The sensor 802 controls the piston end of the hydraulic cylinder 801 to extend, and the hydraulic cylinder 801... The piston end drives the sleeve 701 to rise via the U-shaped frame 803, which in turn drives the horizontal plate 1001 to rise. The horizontal plate 1001 no longer presses against the lower inclined surface of the convex rod 901. The spring drives the convex rod 901 to elastically contract and reset. The sleeve 701 drives the heating tube 303 to rise and slide. Subsequently, the U-shaped frame 803 contacts and presses against the upper inclined surface of the convex rod 901. The force on the convex rod 901 causes the spring to elastically extend to the right until the heating tube 303, the sleeve 701, and the U-shaped frame 803 are reset. The U-shaped frame 803 passes over the upper inclined surface of the convex rod 901. The spring drives the convex rod 901 to elastically contract and reset. The top of the convex rod 901 abuts against the bottom of the U-shaped frame 803, limiting the U-shaped frame 803. This completes the reset of the entire device.

[0033] A purification method for an exhaust gas purification device used in gearbox housing casting, applicable to the aforementioned exhaust gas purification device for gearbox housing casting, includes the following steps: S1: Control the cold air blower 201 to output cold air and control the hot air blower 301 to output hot air. The cold air is blown into the exhaust pipe 101 through the cold air pipe 202 to cool the exhaust gas. The impeller 501 rotates under the impact of the cold air, thereby increasing the gap between the regulating plate B401 and the inner wall of the air supply pipe 302, so that the filter bag 203 is heated. S2: The gas inside the telescopic rod B601 is affected by the temperature inside the factory, causing the telescopic end of the telescopic rod B601 to extend or retract. This allows for further adjustment of the gap between the regulating plate B401 and the inner wall of the gas supply pipe 302 according to the temperature inside the factory, preventing the filter bag 203 from aging due to excessive temperature and ensuring that the filter bag 203 can be heated in time. S3: Sensor 802 controls the piston end of hydraulic cylinder 801 to contract due to the high temperature of exhaust gas, thereby causing heating tube 303 to descend to the lower side of filter bag 203, ensuring that exhaust gas can effectively pass through filter bag 203.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A waste gas purification device for gearbox housing casting, comprising a collection box (1) and an exhaust pipe (101) connected to the collection box (1), characterized in that: Also includes: A cooling mechanism, located inside the exhaust duct (101), is used to cool the exhaust gas. The cooling mechanism includes: Air cooler (201), the air cooler (201) is installed on the collection box (1); The air conditioning duct (202) is installed inside the exhaust duct (101) and connected to the output end of the air cooler (201); The filter bag (203) is installed inside the exhaust pipe (101); Mounting bracket (204) is fixedly fitted onto the outer wall of the air conditioning pipe (202); Telescopic rod A (205) is fixedly installed on mounting bracket (204); Adjustment plate A (206) is vertically inserted and slidably installed on the air conditioning pipe (202), and fixedly installed with the telescopic end of telescopic rod A (205); A heating mechanism is provided inside the exhaust pipe (101) for heating the filter bag (203); The heating mechanism includes a hot air blower (301) installed on the collection box (1), the output end of the hot air blower (301) is connected to a gas supply pipe (302), a shaped groove is opened through the exhaust pipe (101), a heating pipe (303) is slidably installed through the shaped groove in the vertical direction, and a flexible hose is connected between the gas supply pipe (302) and the heating pipe (303); The heating mechanism also includes an adjustment plate B (401) that runs vertically through and is slidably mounted on the gas pipe (302); The heating mechanism also includes an impeller (501) rotatably installed in the air cooling pipe (202), a support frame (502) fixedly installed on the exhaust pipe (101), a sleeve (5021) fixedly installed on the support frame (502), the axle of the impeller (501) rotatably passes through the air cooling pipe (202) and the support frame (502), and is coaxially fixedly connected with the fan blade (503) located in the sleeve (5021), and a circular plate (504) is slidably installed in the sleeve (5021) along the vertical direction; A telescopic rod B (601) is fixedly installed on the circular plate (504) by a support plate. An L-shaped frame (602) is fixedly installed between the telescopic end of the telescopic rod B (601) and the adjusting plate B (401).

2. The exhaust gas purification device for gearbox housing casting according to claim 1, characterized in that: The outer wall of the exhaust pipe (101) is fitted with a sleeve (701), which is fixedly fitted onto the heating pipe (303).

3. The exhaust gas purification device for gearbox housing casting according to claim 2, characterized in that: A hydraulic cylinder (801) is installed on the support frame (502), a sensor (802) electrically connected to the hydraulic cylinder (801) is installed in the collection box (1), and a U-shaped frame (803) that abuts against the piston end of the hydraulic cylinder (801) is fixedly installed on the outer wall of the sleeve (701).

4. The exhaust gas purification device for gearbox housing casting according to claim 3, characterized in that: A U-shaped rod (901) is slidably connected to the support frame (502) along the horizontal direction. A spring is connected between the support frame (502) and the U-shaped rod (901). The U-shaped rod (901) is used in conjunction with the U-shaped frame (803).

5. The exhaust gas purification device for gearbox housing casting according to claim 4, characterized in that: A cross plate (1001) that cooperates with the tangential rod (901) is fixedly fitted on the piston end of the hydraulic cylinder (801).

6. A purification method for an exhaust gas purification device used in gearbox housing casting, applicable to the exhaust gas purification device for gearbox housing casting as described in claim 5, characterized in that, Includes the following steps: S1: Control the cold air blower (201) to output cold air and control the hot air blower (301) to output hot air. The cold air is blown into the exhaust pipe (101) through the cold air pipe (202) to cool the exhaust gas. The impeller (501) rotates under the impact of the cold air, thereby increasing the gap between the regulating plate B (401) and the inner wall of the air supply pipe (302) and causing the filter bag (203) to heat up. S2: The gas inside the telescopic rod B (601) is affected by the temperature inside the factory, causing the telescopic end of the telescopic rod B (601) to extend or retract, thereby further adjusting the gap between the regulating plate B (401) and the inner wall of the gas transmission pipe (302) according to the temperature inside the factory, preventing the filter bag (203) from aging due to excessive temperature, and ensuring that the filter bag (203) can be heated in time. S3: The sensor (802) controls the piston end of the hydraulic cylinder (801) to contract under the influence of the high temperature of the exhaust gas, thereby causing the heating tube (303) to fall to the lower side of the filter bag (203) to ensure that the exhaust gas can pass through the filter bag (203) effectively.

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