An underground cable protection pipe production equipment waste gas purification treatment equipment

Abstract

The application relates to the technical field of waste gas treatment equipment, and discloses underground cable protection pipe production equipment waste gas purification treatment equipment, which comprises a dust removal box, an isolation dust removal device is arranged in the dust removal box, the isolation dust removal device is located below a gas inlet pipe and a dust removal box communication port, the isolation dust removal device is driven to rotate by a servo motor arranged on the dust removal box, and a sealing device is arranged between the isolation dust removal device and the inner wall of the dust removal box. When the dust on the surface of the filter bag is cleaned through back blowing each time, the back blowing airflow drives the dust in the dust removal box to flow through the filter cartridge, the dust is filtered and intercepted by the filter cartridge, the dust separated from the filter bag after back blowing flows to the filter cartridge along the back blowing airflow, thereby adhering to the filter cartridge, the dust particles after back blowing are prevented from adhering to the filter bag again, the subsequent waste gas is prevented from passing through the filter bag, and therefore the waste gas treatment efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment equipment technology, and in particular to a waste gas purification and treatment equipment for underground cable protection pipe production equipment. Background Technology

[0002] During the production of cable protection pipes, dust is inevitably generated because the raw materials are usually plastic granules (PVC, PE, CPVC, etc.). This dust is generated during the feeding and loading process, i.e., when the plastic granules are put from the storage silo into the extruder hopper. If the raw materials used are powdered premixed materials, the amount of dust will be even greater due to the fine debris generated by friction during the transportation and storage of the raw materials. Although these dust particles are particulate matter, they will mix with the organic waste gas (VOCs) generated during the melt extrusion process, forming a gas-solid mixture of pollutants. Therefore, in the waste gas purification treatment, it is necessary to first use a bag filter to filter out the dust particles in the waste gas, and then use an activated carbon adsorption device to adsorb the organic waste gas.

[0003] Existing baghouse dust collectors require a back-flushing system to remove dust adhering to the outer surface of the filter bags, preventing dust from affecting processing efficiency. However, after back-flushing, fine dust separated from the filter bags still accumulates near them. When the exhaust gas is treated again, this dust re-adheres to the filter bags with the exhaust gas flow. This results in poor cleaning effect of back-flushing. Furthermore, because the dust cleaned by back-flushing is still located below the filter bags, it is also easy for it to re-adhere to the filter bags with the subsequent flow of exhaust gas, affecting the purification efficiency of the exhaust gas. Summary of the Invention

[0004] This application proposes a waste gas purification and treatment device for underground cable protection pipe production equipment, which has the advantage that the dust cleaned by backflushing is not easily re-adhered to the filter bag, thereby solving the problem that existing equipment is prone to dust re-adhering to the filter bag after backflushing when filtering waste gas dust, thus affecting the subsequent filtration efficiency.

[0005] To achieve the above objectives, this application adopts the following technical solution: a waste gas purification and treatment device for underground cable protection pipe production equipment, comprising a dust collector, filter bags and an exhaust pipe respectively connected to both sides of the dust collector, a back-blowing airflow duct above the filter bags, a back-blowing spray pipe corresponding to each filter bag at the bottom of the back-blowing airflow duct, the back-blowing airflow duct being connected to a back-blowing airflow input pipe, an installation plate fixedly installed inside the dust collector, a plurality of filter bags fixedly installed at the bottom of the installation plate, an isolation dust removal device being provided inside the dust collector, the isolation dust removal device being located below the connection between the air inlet pipe and the dust collector, and the isolation dust removal device being driven to rotate by a servo motor installed on the dust collector, and a sealing device being provided between the isolation dust removal device and the inner wall of the dust collector.

[0006] The dust removal device includes two positioning rotating plates, with a filter cartridge and two arc-shaped positioning blocks disposed between the two positioning rotating plates. The two arc-shaped positioning blocks are fitted together on both sides of the filter cartridge.

[0007] The sealing device includes a second sealing block that is fitted and sealed to the positioning rotating plate, and a first sealing block that is fitted and sealed to the arc-shaped positioning block. A sealing ring is fixedly installed on the outer side of the positioning rotating plate. The side of the sealing ring away from the positioning rotating plate is fitted to the inner wall of the dust collector. The outer arc wall of the sealing ring is movably fitted to the inner arc walls of the second sealing block and the first sealing block.

[0008] Each time the filter bag surface is cleaned by backflushing, the backflushing airflow carries the dust in the dust collector box through the filter cartridge, where it is filtered and intercepted. The filter cartridge is then driven by a servo motor to rotate half a turn, causing the dust on the surface of the filter cartridge to fall to the bottom of the dust collector box.

[0009] Furthermore, two positioning rotating plates are fixedly connected to positioning rotating shafts on the side facing the inner wall of the dust collection box, and the two positioning rotating shafts are respectively connected to the two side walls of the dust collection box through bearings. The output rotating shaft of the servo motor is fixedly connected to one of the positioning rotating shafts. The two positioning rotating shafts are connected to the inner wall of the dust collection box through bearings, thereby supporting and fixing the entire isolation dust collection device without affecting the servo motor drive output rotating shaft to drive the isolation dust collection device to rotate.

[0010] Furthermore, an exhaust groove is provided in the middle of another positioning plate and positioning shaft. The exhaust groove is connected to an external pipe for backflushing airflow discharge, so that the backflushing airflow can flow from the outside of the filter cartridge to the inside of the filter cartridge and then be discharged through the exhaust groove. The backflushing airflow carries the dust separated from the filter bag to the filter cartridge and attaches to the surface of the filter cartridge. By rotating the filter cartridge, the side of the filter cartridge with dust attached rotates to the bottom, so that the backflushing to clean the dust attached to the filter bag does not affect the subsequent filtration of the exhaust gas, reducing the backflushing frequency and improving the exhaust gas treatment efficiency. Moreover, by utilizing the limitation of the exhaust gas flow rate of the exhaust groove, that is, the flow rate of the backflushing airflow is greater than the flow rate of the exhaust gas discharged from the exhaust groove, it is beneficial to the backflushing stage. The airflow entering the filter cartridge also acts on the lower half of the filter cartridge, causing the dust attached to the surface of the lower half of the filter cartridge to be blown off. So that when the filter cartridge is rotated next time, the amount of dust attached to the surface of the filter cartridge when the lower half rotates to the upper half is reduced, which is beneficial to the exhaust during the backflushing stage and the adsorption of dust separated from the filter bag.

[0011] Furthermore, several connecting rods arranged in a circular array are fixedly installed between the two positioning rotating plates, and the connecting rods are close to the outer edge of the positioning rotating plates. Arc-shaped rods arranged at equal intervals are fixedly installed between the several connecting rods. The filter cartridge is fitted on the outside of the arc-shaped rods. The filter cartridge is spliced ​​into a cylindrical frame by several connecting rods and arc-shaped rods, so that the surface of the filter cartridge fitted on the frame is flattened, which is conducive to the airflow passing through the filter cartridge and filtering dust.

[0012] Furthermore, the arc-shaped positioning block has a groove facing the filter cartridge, which facilitates the sliding of large dust particles falling in the exhaust gas onto the surface of the filter cartridge and into the groove, without affecting the airflow through the surface of the filter cartridge and the interception of smaller dust particles.

[0013] Furthermore, the sealing device also includes two limiting plates arranged vertically. The limiting plates are fixedly installed on the inner wall of the dust collector by an L-shaped fixing bracket. A limiting frame facing the filter cartridge is fixedly installed between the two limiting plates. The first sealing block is fixedly installed on one side of the limiting frame. Through the fixed arrangement of the limiting plates and the limiting frame, the first sealing block can fit against the filter cartridge on one side to form a seal.

[0014] Furthermore, the uniform and smooth chamfer design on both sides of the filter cartridge and the first sealing block allows the first sealing block to form a tight seal with the filter cartridge, while also facilitating the filter cartridge to pass through the first sealing block when the filter cartridge rotates relative to it.

[0015] Furthermore, two arc-shaped frames are fixedly installed between the two upper limiting plates on both sides of the second sealing block. The two arc-shaped frames are respectively located at both ends of the limiting plates. The second sealing block is set inside the arc-shaped frames. Through the fixed setting of the arc-shaped frames, the second sealing block fixed inside the arc-shaped frames is movably fitted with the positioning rotating plate to form an effective seal, ensuring that the backflushing airflow can flow through the filter cartridge, while ensuring that the rotation of the positioning rotating plate will not affect the second sealing block, thereby affecting the subsequent sealing performance between the second sealing block and the filter cartridge.

[0016] Furthermore, a cleaning device is fixedly installed inside the dust collector, located below one of the sealing devices. The cleaning device includes a limiting plate, which is close to but does not contact the positioning rotating plate and one of the sealing devices. Limiting shafts are fixedly installed at both ends of the limiting plate, and the two limiting shafts are fixedly connected to the inner walls of both sides of the dust collector. A cleaning brush is fixedly installed on one side of the limiting plate, and the end of the cleaning brush away from the limiting plate is movably connected to the surface of the filter cartridge. When the filter cartridge rotates, the cleaning brush cleans the dust adhering to the surface of the filter cartridge, causing the dust to fall to the bottom of the dust collector cavity for collection and treatment. In conjunction with the back-blowing stage and the exhaust volume limitation of the exhaust groove, the back-blowing airflow flows downwards and acts on the filter cartridge below, which is conducive to the further removal of dust adhering to the surface of the filter cartridge and its passage.

[0017] Furthermore, the inner wall of the dust collector is fixedly installed with two first guide blocks, which are respectively located above the two sealing devices. The top of the first guide block is designed with a slope, and one end of the first guide block extends to the top of the arc-shaped positioning block. The interior of the dust collector is fixedly installed with two second guide blocks, which are arranged perpendicularly to the first guide blocks. The top of the second guide blocks is designed with a slope, and the top of the second guide blocks extends to the top of the filter cartridge. Through the structural arrangement of the first and second guide blocks, dust particles falling near the inner wall of the dust collector can roll into the groove. Then, when the filter cartridge and the arc-shaped positioning block are rotated, the dust particles collected in the groove fall to the bottom of the inner cavity of the dust collector.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The exhaust gas purification and treatment equipment for underground cable protection pipe production equipment provided in this application has an internally installed filter cartridge located below the connection between the air inlet pipe and the dust collector. During each backflushing to clean the dust on the surface of the filter bag, the backflushing airflow carries the dust in the dust collector through the filter cartridge, which filters and intercepts the dust. The dust separated from the filter bag after backflushing flows with the backflushing airflow to the filter cartridge, thereby adhering to the filter cartridge and preventing the dust particles after backflushing from re-adhering to the filter bag, which would affect the subsequent passage of exhaust gas through the filter bag, thus improving the efficiency of exhaust gas treatment.

[0020] 2. By rotating the dust-covered part of the filter cartridge to the bottom and sealing it with the sealing device, the dust cleaned from the filter bag after backflushing will not flow with the exhaust gas flow back to the filter bag, thus preventing the dust from re-adhering to the filter bag and further improving the efficiency of exhaust gas treatment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the dust collector of the present invention;

[0024] Figure 3 for Figure 2 The front view;

[0025] Figure 4 for Figure 2 Schematic diagram of the central isolation dust removal device and sealing device;

[0026] Figure 5 for Figure 4 The front view;

[0027] Figure 6 for Figure 4 A schematic diagram of the cross-sectional structure at point aa in the diagram;

[0028] Figure 7 for Figure 4 Schematic diagram of the cross-sectional structure at point bb in the diagram;

[0029] Figure 8 for Figure 2 A schematic diagram of the cleaning device.

[0030] In the diagram: 1. Dust collector; 2. Mounting plate; 3. Filter bag; 4. Inlet pipe; 5. Outlet pipe; 6. Backflush airflow duct; 7. Backflush airflow input pipe; 8. Isolation dust removal device; 801. Positioning rotating plate; 8011. Exhaust trough; 802. Positioning rotating shaft; 803. Connecting rod; 804. Arc rod; 805. Filter cartridge; 806. Arc positioning block; 8061. Groove; 9. Sealing device; 901. Limiting plate; 902. Limiting frame; 903. First sealing block; 904. Arc frame; 905. Second sealing block; 10. Servo motor; 11. Sealing ring; 12. Cleaning device; 121. Limiting plate; 122. Limiting shaft; 123. Cleaning brush; 13. First guide block; 14. Second guide block. Detailed Implementation

[0031] 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.

[0032] Examples, such as Figures 1-3A waste gas purification and treatment device for underground cable protection pipe production equipment includes a dust collector 1. An installation plate 2 is fixedly installed inside the dust collector 1. Several filter bags 3 are arranged below the installation plate 2. An air inlet pipe 4 is connected to one side of the dust collector 1, with the connection point between the air inlet pipe 4 and the dust collector 1 located below the bottom of the filter bags 3. An air outlet pipe 5 is connected to the other side of the dust collector 1, with the connection point between the air outlet pipe 5 and the dust collector 1 located above the installation plate 2. Waste gas generated during the production of cable protection pipes in the factory enters the interior of the dust collector 1 through the air inlet pipe 4 and passes through the filter bags. 3. The dust particles in the exhaust gas are filtered out. The dust-filtered exhaust gas flows to the next stage of treatment equipment through the exhaust pipe 5. The dust collector 1 is equipped with several back-blowing airflow ducts 6 located above the mounting plate 2. The bottom of the back-blowing airflow duct 6 is connected to the back-blowing nozzle located at the top of the filter bag 3. One end of the back-blowing airflow duct 6 is connected to the back-blowing airflow input pipe 7. The blowing airflow enters through the back-blowing airflow input pipe 7 and is divided into each back-blowing airflow duct 6. It is then sprayed out through the back-blowing nozzle at the bottom of the back-blowing airflow duct 6, thereby removing the dust attached to the outer surface of the filter bag 3.

[0033] Please see Figures 1-2 , Figures 4-7 The dust collector 1 is equipped with an isolation dust removal device 8 located below the connection between the air inlet pipe 4 and the dust collector 1. Sealing devices 9 are installed on both sides of the isolation dust removal device 8. The isolation dust removal device 8 includes two positioning rotating plates 801. Positioning rotating shafts 802 are fixedly connected to the sides of the two positioning rotating plates 801 facing the inner wall of the dust collector 1, and the two positioning rotating shafts 802 are connected to the two side walls of the dust collector 1 via bearings, allowing the two positioning rotating shafts 802 and the positioning rotating plates 801 to rotate relative to the dust collector 1. A servo motor 10 is fixedly installed on the front of the dust collector 1. The output shaft of the servo motor 10 is fixedly connected to one of the positioning rotating shafts 802. The servo motor 10 drives the output shaft to rotate the positioning rotating shaft 802 and the positioning rotating plate 801. An exhaust groove 8011 is opened in the middle of the other positioning rotating plate 801 and the positioning rotating shaft 802. The exhaust groove 8011 is connected to an external pipe for backflushing airflow discharge (because this pipe is in...). Figures 1-3 The back of the attached diagram (and the exhaust pipe is common knowledge, so it is not shown and will not be described in detail) is connected, and a solenoid valve is installed on the pipe for backflushing airflow discharge. When the backflushing airflow removes the dust attached to the outer surface of the filter bag 3, the solenoid valve on the pipe for backflushing airflow discharge opens so that the backflushing airflow can be discharged.

[0034] A number of connecting rods 803 arranged in a circular array are fixedly installed between two positioning rotating plates 801, and the connecting rods 803 are close to the outer edge of the positioning rotating plates 801. Arc-shaped rods 804 arranged at equal intervals are fixedly installed between the connecting rods 803. A filter cartridge 805 located outside the arc-shaped rods 804 is provided between the two positioning rotating plates 801. Two arc-shaped positioning blocks 806 are fixedly installed between the two positioning rotating plates 801. The two arc-shaped positioning blocks 806 are respectively located on both sides of the filter cartridge 805, and the inner arc wall of the arc-shaped positioning block 806 fits against the outer arc wall of the filter cartridge 805. A groove 8061 facing the filter cartridge 805 is opened on the arc-shaped positioning block 806 so that dust particles can roll into the groove 8061 for collection.

[0035] The sealing device 9 includes two limiting plates 901 arranged vertically. The limiting plates 901 are fixedly installed on the inner wall of the dust collector 1. A limiting frame 902 facing one side of the filter cartridge 805 is fixedly installed between the two limiting plates 901. A first sealing block 903 is fixedly installed on the limiting frame 902. One side of the first sealing block 903 is movably fitted against the outer arc wall of the filter cartridge 805. The filter cartridge 805 and the two sides of the first sealing block 903 have uniform and smooth chamfer design, which allows the filter cartridge 805 to move with the arc rod 804, the connecting rod 803, and the positioning rotation. The shaft 802 and the positioning rotating plate 801 rotate relative to the first sealing block 903, and when the filter cartridge 805 rotates to fit against the first sealing block 903, a seal is formed at the fitting point of the first sealing block 903 and the filter cartridge 805. Two arc-shaped frames 904 are fixedly installed between the two upper limiting plates 901 on both sides of the second sealing block 905. The two arc-shaped frames 904 are respectively located at both ends of the limiting plates 901. The second sealing blocks 905 are provided on the inner side of the arc-shaped frames 904. The second sealing blocks 905 on the inner side of the two arc-shaped frames 904 are respectively The sealing ring 11 is fixedly installed on the outer side of the positioning rotating plate 801, and the side of the sealing ring 11 away from the positioning rotating plate 801 is in contact with the inner wall of the dust collector 1 to form a seal. The outer arc wall of the sealing ring 11 is in contact with the inner arc wall of the second sealing block 905 and the first sealing block 903 to form a seal. Thus, through the sealing device 9 and the sealing ring 11, when cleaning the dust attached to the surface of the filter bag 3 during backflushing, the airflow passes through the upper half of the filter cartridge 805 and from the sealing device 9 and the sealing ring 11. Exhaust from exhaust trough 8011 allows the downward backflushing airflow to help move dust downwards and adhere to the surface of filter cartridge 805. After backflushing, the servo motor 10 drives the output shaft to rotate the positioning plate 801, the two positioning shafts 802, and the filter cartridge 805 half a turn, changing the upper and lower positions of the filter cartridge 805 surface. This causes the dust-adsorbed part of the filter cartridge 805 to rotate downwards, thus preventing this part of the dust from re-adhering to the surface of the filter bag 3 with the upward airflow of the exhaust gas during subsequent exhaust gas treatment.

[0036] Please seeFigures 2-4 , Figure 8 Inside the dust collector 1, a cleaning device 12 is fixedly installed below one of the sealing devices 9. The cleaning device 12 includes a limiting plate 121. The limiting plate 121 is close to but does not contact the positioning rotating plate 801 and one of the sealing devices 9. Limiting shafts 122 are fixedly installed at both ends of the limiting plate 121. The two limiting shafts 122 are fixedly connected to the inner walls of both sides of the dust collector 1. A cleaning brush 123 is fixedly installed on one side of the limiting plate 121. The end of the cleaning brush 123 away from the limiting plate 121 is movably connected to the surface of the filter cartridge 805. When the filter cartridge 805 rotates, the cleaning brush 123 cleans the dust adhering to the surface of the filter cartridge 805, so that the dust falls to the bottom of the inner cavity of the dust collector 1 for collection and treatment. With the back-blowing stage and the exhaust volume limitation of the exhaust groove 8011, the back-blowing airflow flows downward and acts on the filter cartridge 805 below, which is conducive to the further removal of dust adhering to the surface of the filter cartridge 805.

[0037] The inner wall of the dust collector 1 is fixedly installed with two first guide blocks 13, which are located above the two sealing devices 9 respectively. The top of the first guide block 13 is designed with a slope, and one end of the first guide block 13 extends to the top of the arc-shaped positioning block 806. The inside of the dust collector 1 is fixedly installed with two second guide blocks 14, which are arranged perpendicularly to the first guide blocks 13. The top of the second guide blocks 14 is designed with a slope, and the top of the second guide blocks 14 extends to the top of the filter cartridge 805. Through the structural arrangement of the first guide blocks 13 and the second guide blocks 14, the dust particles falling near the inner wall of the dust collector 1 can roll into the groove 8061. Then, when the filter cartridge 805 and the arc-shaped positioning block 806 are rotated, the dust particles collected in the groove 8061 fall to the bottom of the inner cavity of the dust collector 1.

[0038] During operation, the exhaust gas generated during the production of cable protection pipes in the factory enters the dust collector 1 through the inlet pipe 4. Dust particles in the exhaust gas are filtered out by the filter bags 3. The dust-free exhaust gas then flows to the next stage of treatment equipment through the outlet pipe 5. As the exhaust gas treatment progresses, a large amount of dust accumulates on the surface of the filter bags 3. The passage through the inlet pipe 4 is then closed, allowing the backflushing airflow to enter through the backflushing airflow input pipe 7 and be distributed into each backflushing airflow duct 6. The backflushing airflow is then sprayed into the interior of each filter bag 3 by the backflushing nozzles located at the bottom of the backflushing airflow duct 6. The airflow from inside the filter bag 3 sprays outward to remove dust adhering to its outer surface. At the same time, the back-blowing airflow flows over the surface of the filter cartridge 805 and is discharged from the exhaust groove 8011. The back-blowing airflow carries the dust removed from the surface of the filter bag 3 to the surface of the filter cartridge 805. After the back-blowing is completed, the servo motor 10 drives the output shaft to rotate the positioning shaft 802, the two positioning plates 801 and the filter cartridge 805 half a turn, so that the side of the filter cartridge 805 that adsorbs dust rotates downward, thereby causing the dust to fall to the bottom of the inner cavity of the dust collector 1.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waste gas purification and treatment device for underground cable protection pipe production equipment, comprising a dust collector, an inlet pipe and an outlet pipe respectively connected to both sides of the dust collector, a back-blowing airflow duct above the filter bags, a back-blowing spray pipe at the bottom of the back-blowing airflow duct, the back-blowing airflow duct being connected to a back-blowing airflow input pipe, an mounting plate fixedly installed inside the dust collector, and a plurality of filter bags fixedly installed at the bottom of the mounting plate, characterized in that, The dust collector is equipped with an isolation dust removal device inside. The isolation dust removal device is located below the air inlet pipe and is driven to rotate by a servo motor installed on the dust collector. A sealing device is provided between the isolation dust removal device and the inner wall of the dust collector. The dust removal device includes two positioning rotating plates, a filter cartridge and two arc-shaped positioning blocks are arranged between the two positioning rotating plates, and the two arc-shaped positioning blocks are fitted together on both sides of the filter cartridge. The sealing device includes a second sealing block that is fitted and sealed to the positioning rotating plate, and a first sealing block that is fitted and sealed to the arc-shaped positioning block. A sealing ring is fixedly installed on the outer side of the positioning rotating plate. The side of the sealing ring away from the positioning rotating plate is fitted to the inner wall of the dust collector. The outer arc wall of the sealing ring is movably fitted to the inner arc walls of the second sealing block and the first sealing block. Each time the filter bag is cleaned by backflushing, the backflushing airflow carries the dust in the dust collector through the filter cartridge. After the backflushing is completed, the filter cartridge is rotated half a turn by the servo motor, so that the dust on the surface of the filter cartridge falls to the bottom of the dust collector's inner cavity. Two positioning rotating plates are fixedly connected to positioning rotating shafts on the side facing the inner wall of the dust collector, and the two positioning rotating shafts are respectively connected to the two side walls of the dust collector through bearings. The output rotating shaft of the servo motor is fixedly connected to one of the positioning rotating shafts for transmission. Several connecting rods arranged in a circular array are fixedly installed between the two positioning rotating plates, and the connecting rods are close to the outer edge of the positioning rotating plates. Arc-shaped rods arranged at equal intervals are fixedly installed between the several connecting rods, and the filter cartridge is fitted on the outside of the arc-shaped rods. The arc-shaped positioning block has a groove facing the filter cylinder; The sealing device also includes two limiting plates arranged at the top and bottom. The limiting plates are fixedly installed on the inner wall of the dust collector. A limiting frame facing the filter cartridge is fixedly installed between the two limiting plates. The first sealing block is fixedly installed on one side of the limiting frame. Another positioning rotating plate and positioning rotating shaft have an exhaust groove in the middle, and the exhaust groove is connected to an external pipe for backflushing airflow discharge; Two arc-shaped frames are fixedly installed between the two upper limiting plates on both sides of the second sealing block. The two arc-shaped frames are located at both ends of the limiting plates, and the second sealing block is located inside the arc-shaped frames.

2. The waste gas purification and treatment equipment for underground cable protection pipe production equipment according to claim 1, characterized in that, The dust collector is fixedly installed inside, with a cleaning device located below one of the sealing devices. The cleaning device includes a limiting plate, which is close to but does not contact the positioning rotating plate and one of the sealing devices. Limiting shafts are fixedly installed at both ends of the limiting plate, and the two limiting shafts are fixedly connected to the inner walls of both sides of the dust collector. A cleaning brush is fixedly installed on one side of the limiting plate, and the end of the cleaning brush away from the limiting plate is movably connected to the surface of the filter cartridge.

3. The waste gas purification and treatment equipment for underground cable protection pipe production equipment according to claim 1, characterized in that, Two first guide blocks are fixedly installed on the inner wall of the dust collector. The two first guide blocks are located above the two sealing devices respectively. The top of the first guide block is designed with a slope, and one end of the first guide block extends to the top of the arc-shaped positioning block. Two second guide blocks are fixedly installed inside the dust collector. The two second guide blocks are set perpendicular to the first guide blocks. The top of the second guide blocks is designed with a slope, and the top of the second guide blocks extends to the top of the filter cartridge.

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