Cyclone and electrostatic combined type dedusting and dehumidifying all-in-one machine

Abstract

The invention relates to the field of dust removal, in particular to a cyclone electrostatic combined type dust removal and dehumidification all-in-one machine. The invention relates to a dust collector, and aims to solve the problems that a small amount of dust particles still possibly exist in clean air and cannot be removed, and dust is easy to adhere to and harden on the inner wall or a dust discharge port to gradually block an airflow channel or the dust discharge port when facing dust with viscosity or relatively high humidity, so that the dust is difficult to clean. According to the technical scheme, the cyclone electrostatic combined type dust removal and dehumidification all-in-one machine comprises an outer ring shell; a dust discharging pipe for discharging dust is mounted on the lower side of the outer ring shell; a cone is arranged on the inner side of the outer ring shell, and the lower side of the cone is rotationally connected with the dust discharging pipe. An exhaust cone for guiding clean gas to be exhausted is mounted at the bottom of the inner side of the cone; reverse high-speed air flow is introduced into the reverse air inlet pipe, and caked dust on the inner wall of the cone is rapidly impacted by the reverse air flow to be cleaned.

Description

Technical Field

[0001] This invention relates to the field of dust removal, and more particularly to a cyclone electrostatic composite dust removal and dehumidification integrated machine. Background Technology

[0002] Cyclone dust collectors accelerate and guide dust-laden gas into a high-speed rotating vortex field. They utilize the centrifugal force generated by the density difference between dust particles and gas to throw the dust against the outer wall and collect it. The purified gas is then discharged from the center. Cyclone dust collectors have the advantages of high efficiency, simplicity, and ease of operation.

[0003] A wet cyclone dust collector, disclosed in Chinese Patent Publication No. CN104645768B, achieves dust removal by combining a spray tower with multiple dust removal methods. However, during use, for dust particles smaller than 10 micrometers (especially <5 micrometers), the centrifugal force is insufficient, and the particles easily escape with the internal cyclone, resulting in a sharp drop in dust removal efficiency. Therefore, a small amount of dust particles may still remain in the clean air and cannot be removed. At the same time, when dealing with sticky or highly humid dust, the dust easily adheres to and clumps on the inner wall or dust outlet, gradually blocking the airflow channel or dust outlet, making it difficult to clean. Summary of the Invention

[0004] To overcome the shortcomings of the fact that a small amount of dust particles may still remain in clean air and cannot be removed, and that when faced with sticky or highly humid dust, the dust tends to adhere and clump on the inner wall or dust outlet, gradually blocking the airflow channel or dust outlet, making it difficult to clean, this invention provides a cyclone electrostatic composite dust removal and dehumidification integrated machine.

[0005] Technical Solution: A cyclone electrostatic composite dust removal and dehumidification integrated machine includes an outer ring shell; a dust discharge pipe for dust removal is installed on the lower side of the outer ring shell; a cone is provided on the inner side of the outer ring shell, the cone has a hollow structure, the bottom of which is connected to the dust discharge pipe, and the lower side of the cone is rotatably connected to the dust discharge pipe; an exhaust cone for guiding clean gas out is installed at the bottom of the inner side of the cone; it also includes a dryer, a forward air inlet pipe, a reverse air inlet pipe, a fixed sliding block, and a hammer; a pipe containing dust and moisture is connected to the right side of the dryer; the forward air inlet pipe and the reverse air inlet pipe are respectively connected to the dryer; both the forward air inlet pipe and the reverse air inlet pipe are connected to the inside of the cone, and both are designed tangentially to the cone; a slide is provided on the inner side of the outer ring shell, and a spring is provided in the slide, and a fixed sliding block that can slide in the slide is fixed to each spring; all fixed sliding blocks are connected to the cone; multiple hammers for striking the outer wall of the cone are installed on the inner side of the outer ring shell through elastic rods.

[0006] Furthermore, it is particularly preferred that the outer ring shell and the center point of the cone are on the same vertical line.

[0007] Furthermore, it is particularly preferred that the maximum sliding angle of the inner slide rail of the outer ring shell is degrees.

[0008] Furthermore, it is particularly preferred that the forward intake pipe and the reverse intake pipe have opposite air intake directions.

[0009] Furthermore, it is particularly preferred that solenoid valves are installed in both the forward and reverse air intake pipes, thereby controlling the airflow to enter the cone only from the forward and reverse air intake pipes, and preventing it from entering the forward and reverse air intake pipes from the cone.

[0010] Furthermore, it is particularly preferred that the dryer is equipped with an electrostatic pre-dust removal component.

[0011] In addition, it is particularly preferred that the device also includes scrapers; several scrapers are fixedly connected to the bottom of the cone in a ring, and the several scrapers are fixedly connected to the exhaust cone together, thereby fixing the exhaust cone.

[0012] Furthermore, it is particularly preferred that a dust discharge port is formed between the dust discharge pipe and the exhaust cone, and that a scraper is installed at the dust discharge port and contacts the inner circumferential surface of the dust discharge pipe.

[0013] Furthermore, preferably, it also includes a separator, a connecting pipe, an exhaust pipe, an elastic element, and a first diverter; the separator is fixed by an external exhaust device; a connecting pipe is fixedly connected to the lower side of the separator, and the connecting pipe has a hollow structure; an exhaust pipe for clean air discharge is connected to the lower side of the separator, and the connecting pipe and the exhaust pipe cooperate to form a compressed cavity; an elastic element is fixedly connected to the inner side of the connecting pipe; the lower side of the elastic element is fixedly connected to the exhaust pipe, and the exhaust pipe can slide inside the connecting pipe; a first diverter is connected between the reverse intake pipe and the compressed cavity, and a solenoid valve is provided on the first diverter to control the airflow.

[0014] Furthermore, it is particularly preferred that the device also includes a second diverter pipe, a filter cloth, and a pull rod; a filter cloth for filtering residual dust in clean air is fixedly connected to the inside of the separation pipe; a second diverter pipe is connected between the reverse air intake pipe and the separation pipe, and a solenoid valve is provided on the second diverter pipe to control the airflow, and the second diverter pipe is located above the filter cloth; a pull rod is fixedly connected to the middle of the lower surface of the filter cloth, and the lower side of the pull rod is fixedly connected to the exhaust pipe.

[0015] The beneficial effects of the present invention are: the present invention realizes the cleaning operation by introducing a reverse high-speed airflow into the reverse air intake pipe and using the reverse airflow to quickly impact the agglomerated dust on the inner wall of the cone. Using a reverse intake pipe can serve as a second alternative, avoiding prolonged wear at the initial gas contact point of the cone due to a single intake pipe, thus extending the cone's service life. By sealing the bottom of the exhaust pipe, the gas inside the cone cannot enter the exhaust pipe. As the gas continues to flow in, the internal pressure of the cone continues to rise. Then, the high-pressure, high-speed gas quickly passes through the bottom of the cone and the dust outlet, thus squeezing and cleaning the clumps of dust at that location. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the cyclone electrostatic composite dust removal and dehumidification integrated machine of the present invention; Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 This is a cross-sectional view of the outer ring shell of the present invention; Figure 4 This is a three-dimensional structural diagram of the reverse air intake pipe of the present invention; Figure 5 This is a sectional view of the cone-shaped part of the present invention; Figure 6 This is a three-dimensional structural diagram of the combination of the forward air intake pipe and the reverse air intake pipe of the present invention. Figure 7 This is a three-dimensional structural diagram of the exhaust cone and scraper assembly of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the scraper of the present invention; Figure 9 This is a cross-sectional view of the connecting pipe of the present invention; Figure 10 This is a cross-sectional view of the assembly of the separator, connecting pipe, and exhaust pipe of the present invention; Figure 11 This is a front view of the separator, connecting pipe, and exhaust pipe of the present invention. Detailed Implementation

[0017] 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.

[0018] Example 1

[0019] A cyclone electrostatic composite dust removal and dehumidification machine, as shown in Figure-1. Figure 8 As shown, it includes an outer ring shell 1, a dust discharge pipe 2, a cone 3, and an exhaust cone 4; the dust discharge pipe 2 is installed on the lower side of the outer ring shell 1; the cone 3 is provided on the inner side of the outer ring shell 1, the cone 3 is a hollow structure, the bottom of which is connected to the dust discharge pipe 2, and the lower side of the cone 3 is rotatably connected to the dust discharge pipe 2; the exhaust cone 4 is installed on the bottom of the inner side of the cone 3. It also includes a dryer 101, a forward air inlet pipe 102, a reverse air inlet pipe 103, a fixed sliding block 104, and a hammer 105; the right side of the dryer 101 is connected to a pipe containing dust and moisture; the dryer 101 is connected to the forward air inlet pipe 102 and the reverse air inlet pipe 103 respectively; the forward air inlet pipe 102 and the reverse air inlet pipe 103 are equipped with solenoid valves to control the airflow; the forward air inlet pipe 102 and the reverse air inlet pipe 103 are both connected to the inside of the cone 3; a slide is opened on the inner side of the outer ring shell 1, and a spring is installed in the slide, and a fixed sliding block 104 that can slide in the slide is fixed to each spring; all the fixed sliding blocks 104 are connected to the cone 3; the hammer 105 is installed on the inner side of the outer ring shell 1 through an elastic rod.

[0020] The center points of the outer ring shell 1 and the cone 3 are on the same vertical line.

[0021] The maximum sliding angle of the inner slide of the outer ring shell 1 is degrees.

[0022] The forward intake pipe 102 and the reverse intake pipe 103 have opposite air intake directions.

[0023] The dryer 101 is equipped with an electrostatic pre-dust removal component. Before the gas enters the dryer 101 and is introduced into the forward air inlet pipe 102 and the reverse air inlet pipe 103, it will pass through the electrostatic pre-dust removal component for pre-dust removal, which will adsorb and eliminate extremely fine dust.

[0024] It also includes scrapers 106; several scrapers 106 are fixedly connected to the bottom of the cone 3 in a ring, and the several scrapers 106 are fixedly connected to the exhaust cone 4 together, thereby fixing the exhaust cone 4.

[0025] A dust discharge port 2001 is formed between the dust discharge pipe 2 and the exhaust cone 4, and a scraper 106 is installed at the dust discharge port 2001 and contacts the inner ring surface of the dust discharge pipe 2. The scraper 106 then scrapes off and cleans the dust accumulated on the dust discharge pipe 2 at the dust discharge port 2001.

[0026] When the dust-laden gas to be treated is introduced into the dryer 101, the electrostatic pre-dust removal component inside the dryer 101 is pre-activated. Before the gas enters the dryer 101 and flows into the forward inlet pipe 102, it undergoes pre-dust removal by the electrostatic pre-dust removal component, which performs primary adsorption and elimination of extremely fine dust particles. At the same time, the solenoid valve on the reverse inlet pipe 103 is closed, and the solenoid valve on the forward inlet pipe 102 is opened to ensure that the gas enters the cone 3 only from the forward inlet pipe 102. Simultaneously, the dryer 101 is activated, allowing the gas to be pre-dried before entering the cone 3. To avoid excessive humidity and severe clumping, after the above preparations are completed, the gas to be treated is introduced. When the gas enters the cone 3, because the forward inlet pipe 102 is tangentially designed to the cone 3, this tangential design forces the airflow to form a high-speed downward rotating external vortex along the inner wall of the cone 3. During this high-speed rotation, the dust particles in the airflow, due to their much higher density than the gas, are subjected to a strong centrifugal force. Driven by this centrifugal force (which is much greater than gravity), the particles are thrown towards the inner wall of the cone 3. The particles thrown towards the inner wall of the cone 3 then interact with the cone... After colliding with the inner wall of body 3, the gas loses kinetic energy and, under the combined action of the downward airflow and its own gravity, spirals downwards along the wall of cone 3, eventually entering dust exhaust pipe 2 through the bottom dust exhaust port 2001 and finally being discharged outwards. Meanwhile, the downward-rotating external airflow, upon reaching the bottom of cone 3, due to the contraction of the cone shape and the sealing of the bottom, causes most of the airflow (which is now relatively purified) to form an upward internal airflow under the action of exhaust cone 4. This internal airflow spirals upwards from the central axis region of cone 3 and is finally discharged from the top, becoming purified gas. In the above process… As moist dust accumulates and clumps at the air outlet of the forward air inlet 102, the inner wall of the cone 3, and the dust outlet 2001, blockages can easily occur. At the same time, the dust clumps accumulated on the inner wall of the cone 3 will seriously affect the continuous cleaning of subsequent dust, resulting in a significant reduction in the cleaning effect. In the prior art, when the above situation occurs, it is necessary to stop the machine in time and manually clean the air outlet of the forward air inlet 102, the inner wall of the cone 3, and the dust outlet 2001, that is, to handle it by knocking or manually scraping it off. This not only has poor cleaning effect, but also has high operation difficulty.

[0027] To address the aforementioned cleaning difficulties, during the air intake process through the forward intake pipe 102, the cone 3 is positioned as follows: Figure 5 As shown, even when air is introduced into the intake pipe 102, the cone 3 is impacted by the airflow and cannot rotate counterclockwise when viewed from above, thus ensuring its stable state and allowing its dust removal work to proceed normally.

[0028] When it is necessary to clean the clumps, first stop the machine, then close the solenoid valve of the forward air intake pipe 102 and open the solenoid valve of the reverse air intake pipe 103. At the same time, clean and dry air is introduced into the dryer 101. Since the reverse air intake pipe 103 and the forward air intake pipe 102 have opposite air intake directions, when the high-speed airflow enters rapidly from the reverse air intake pipe 103, the cone 3 is impacted by the airflow. Taking a top-down view as a reference, the fixed sliding block 104 rotates clockwise in the slide of the outer ring shell 1, thereby synchronously causing the cone 3 to rotate as well, and synchronously compressing the corresponding spring. During this process, the rapid impact of the reverse airflow causes the cone 3 to collide with the hammer 105, thereby loosening the clumps of dust on the inner wall of the cone 3. It is easy to detach. At the same time, when the airflow enters the forward air intake pipe 102 and forms agglomerates, due to the fixed airflow direction, the agglomerated dust will be distributed in a "strip" or "spiral" shape along the spiral airflow direction. Therefore, the initial agglomerates will show a spiral texture in the same direction as the airflow rotation. Therefore, when the reverse high-speed airflow quickly enters the cone 3, it impacts the agglomerated dust from the opposite direction. At the same time, it is combined with the hammer 105 to knock it off effectively. In order to ensure the cleaning effect, the above operation can be repeated multiple times, and each operation time is 10-20 seconds. That is, the external clean gas is intermittently controlled to enter the cone 3 from the reverse air intake pipe 103 to achieve intermittent operation and achieve the cleaning purpose.

[0029] At the same time, as the cone 3 rotates, it drives the scraper 106 to rotate simultaneously, thereby scraping off and cleaning the clumps of dust at the dust discharge port 2001, effectively solving the blockage problem.

[0030] Meanwhile, the reverse air intake pipe 103 can also be used as a second alternative. That is, when the forward air intake pipe 102 is damaged and leaks or has other problems, in order not to affect the normal dust removal work, the reverse air intake pipe 103 can also be used as a normal air intake pipe. That is, reverse air intake can still achieve the removal and cleaning of dust in the dust-laden gas, and the two can be used alternately to avoid long-term wear on the initial contact position of the cone 3 with the gas at a single air intake pipe, thereby improving the service life of the cone 3.

[0031] Example 2

[0032] Based on Example 1, such as Figure 5 and Figures 9-11As shown, it also includes a separation pipe 201, a connecting pipe 202, an exhaust pipe 203, an elastic element 204, and a first diverter pipe 205; the separation pipe 201 is connected to an external exhaust device for fixation; the connecting pipe 202 is fixedly connected to the lower side of the separation pipe 201, and the connecting pipe 202 has a hollow structure; the exhaust pipe 203 is connected to the lower side of the separation pipe 201; the elastic element 204, which is a spring, is fixedly connected to the inner side of the connecting pipe 202; the lower side of the elastic element 204 is fixedly connected to the exhaust pipe 203, and the exhaust pipe 203 can slide inside the connecting pipe 202; the reverse intake pipe 103 is connected to the compression cavity 20201 via the first diverter pipe 205, and a solenoid valve is provided on the first diverter pipe 205 to control the airflow.

[0033] The connecting pipe 202 and the exhaust pipe 203 cooperate to form a compression cavity 20201.

[0034] It also includes a second diverter pipe 206, a filter cloth 207, and a pull rod 208; the filter cloth 207 is fixedly connected to the inner side of the separator pipe 201; the second diverter pipe 206 is connected between the reverse intake pipe 103 and the separator pipe 201, and a solenoid valve is provided on the second diverter pipe 206 to control the airflow, and the second diverter pipe 206 is located above the filter cloth 207; the pull rod 208 is fixedly connected to the middle of the lower surface of the filter cloth 207, and the lower side of the pull rod 208 is fixedly connected to the exhaust pipe 203.

[0035] When performing the aforementioned backflushing operation to clean up agglomerated dust, the accumulation of agglomerated dust at the dust outlet 2001 and the bottom of the cone 3 is more severe than at other locations (the rotating airflow is closest to the inner wall of the cone 3, resulting in the greatest centrifugal force, leading to the most intense and frequent impact and adhesion of dust; at the same time, the lower part is usually cooler, making it easier for dust with high humidity to condense and adhere). Therefore, in order to effectively deal with the agglomeration at the above locations, when air is introduced through the reverse air intake pipe 103, the solenoid valves on the first diversion pipe 205 and the second diversion pipe 206 are opened simultaneously, and the gas enters the first diversion pipe 205 and the second diversion pipe 206 simultaneously. Through the first diversion pipe 205 and the second diversion pipe 206, when gas enters the compression cavity 20201 through the first diversion pipe 205, the internal pressure of the compression cavity 20201 increases rapidly. This causes the exhaust pipe 203 to move rapidly downward under the pressure, stretching the elastic element 204 until the bottom of the exhaust pipe 203 contacts the upper surface of the exhaust cone 4. At this point, the exhaust cone 4 blocks the bottom of the exhaust pipe 203, preventing gas from entering the exhaust pipe 203. As gas continues to flow in, the internal pressure of the cone 3 continues to rise, and at this point, gas can only exit through the exhaust fan. Exhaust gas is discharged at outlet 2001, and then high-pressure, high-speed gas rapidly passes through the bottom of cone 3 and dust outlet 2001, achieving the squeezing and cleaning of the clumped dust there. This operation is achieved through pressurization. Simultaneously, after the gas enters the second diversion pipe 206, a small amount of dust remains after the initial clean gas is discharged from exhaust pipe 203 and then through separation pipe 201. This dust then undergoes secondary filtration through filter cloth 207. However, with the use of filter cloth 207, it also experiences clogging and clumping. Therefore, to solve this problem, the second diversion pipe... The airflow introduced at 206 impacts the filter cloth 207 in the reverse direction, backflushing and cleaning the clumps of dust on its lower surface. At the same time, in order to further improve the cleaning effect on the filter cloth 207, when the exhaust pipe 203 moves downward, it simultaneously drives the pull rod 208 to move downward, thereby pulling the filter cloth 207 through the pull rod 208 to deform it, further breaking up the clumps on its lower surface, making it easier to clean. The cleaned clumps automatically fall onto the exhaust cone 4. When the reverse air intake pipe 103 stops air intake, they automatically fall off the exhaust cone 4, realizing the operation of cleaning without disassembly.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cyclone electrostatic composite dust removal and dehumidification integrated machine, comprising an outer ring shell (1); a dust discharge pipe (2) for dust discharge is installed on the lower side of the outer ring shell (1); a cone (3) is provided on the inner side of the outer ring shell (1), the cone (3) is a hollow structure, the bottom of which is connected to the dust discharge pipe (2), and the lower side of the cone (3) is rotatably connected to the dust discharge pipe (2); an exhaust cone (4) for guiding clean gas to be discharged is installed on the bottom of the inner side of the cone (3); characterized in that, It also includes a dryer (101), a forward air inlet pipe (102), a reverse air inlet pipe (103), a fixed sliding block (104), and a hammer (105); the right side of the dryer (101) is connected to a pipe containing dust and moisture; the dryer (101) is connected to the forward air inlet pipe (102) and the reverse air inlet pipe (103); both the forward air inlet pipe (102) and the reverse air inlet pipe (103) are connected to the inside of the cone (3), and both are designed to be tangential to the cone (3); The inner side of the outer ring shell (1) is provided with a slide, and a spring is provided in the slide. Each spring is fixed with a fixed sliding block (104) that can slide in the slide. All the fixed sliding blocks (104) are connected to the cone (3). Multiple hammers (105) for striking the outer wall of the cone (3) are installed on the inner side of the outer ring shell (1) through an elastic rod.

2. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, The center points of the outer ring shell (1) and the cone (3) are on the same vertical line.

3. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, The maximum sliding angle of the inner slide of the outer ring shell (1) is degrees.

4. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, The forward intake pipe (102) and the reverse intake pipe (103) have opposite intake directions.

5. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 4, characterized in that, Solenoid valves are installed in both the forward intake pipe (102) and the reverse intake pipe (103) to control the airflow to enter the cone (3) only from the forward intake pipe (102) and the reverse intake pipe (103), and not from the cone (3) into the forward intake pipe (102) and the reverse intake pipe (103).

6. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, The dryer (101) is equipped with an electrostatic pre-dust removal component.

7. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, It also includes scrapers (106); several scrapers (106) are fixedly connected to the bottom of the cone (3) in a ring, and several scrapers (106) are fixedly connected to the exhaust cone (4) together, thereby fixing the exhaust cone (4).

8. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, A dust discharge port (2001) is formed between the dust discharge pipe (2) and the exhaust cone (4), and a scraper (106) is installed at the dust discharge port (2001) and contacts the inner annular surface of the dust discharge pipe (2).

9. The cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 1, characterized in that, It also includes a separation pipe (201), a connecting pipe (202), an exhaust pipe (203), an elastic element (204), and a first diversion pipe (205); it is fixed to the separation pipe (201) by connecting an external exhaust device; the connecting pipe (202) is fixed to the lower side of the separation pipe (201), and the connecting pipe (202) has a hollow structure; the lower side of the separation pipe (201) is connected to an exhaust pipe (203) for clean air discharge, and the connecting pipe (202) and the exhaust pipe (203) forms a compression cavity (20201); an elastic element (204) is fixedly connected to the inside of the connecting pipe (202); the lower side of the elastic element (204) is fixedly connected to the exhaust pipe (203), and the exhaust pipe (203) can slide inside the connecting pipe (202); a first diverter pipe (205) is connected between the reverse intake pipe (103) and the compression cavity (20201), and a solenoid valve is provided on the first diverter pipe (205) to control the flow of air.

10. A cyclone electrostatic composite dust removal and dehumidification integrated machine according to claim 9, characterized in that, It also includes a second diversion pipe (206), a filter cloth (207) and a pull rod (208); the filter cloth (207) for filtering residual dust in clean air is fixedly connected to the inside of the separation pipe (201); the second diversion pipe (206) is connected to the reverse air intake pipe (103) and the separation pipe (201), and a solenoid valve is provided on the second diversion pipe (206) to control the flow of air, and the second diversion pipe (206) is located above the filter cloth (207); the pull rod (208) is fixedly connected to the middle of the lower surface of the filter cloth (207), and the lower side of the pull rod (208) is fixedly connected to the exhaust pipe (203).

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