Waste gas purification treatment equipment for underground cable protection pipe production equipment

Abstract

The invention 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, and the isolation dust removal device is located below a communicating opening of a gas inlet pipe and the dust removal box. The isolation dust removal device is driven by a servo motor arranged on the dust removal box to rotate, and a sealing device is arranged between the isolation dust removal device and the inner wall of the dust removal box. Through the inner arrangement located below the communicating port of the air inlet pipe and the dust removal box, when dust on the surface of the filter bag is cleaned through back flushing every time, back flushing airflow drives the dust in the dust removal box to flow through the filter cylinder in the dust removal box and is filtered and intercepted by the filter cylinder, so that the dust separated from the filter bag after back flushing flows to the filter cylinder along with the back flushing airflow and is attached to the filter cylinder; dust particles after back flushing are prevented from being attached to the filter bag again to influence subsequent waste gas passing through the filter bag, so that the waste gas treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment equipment, and particularly relates to a waste gas purification treatment equipment for underground cable protection pipe production equipment. BACKGROUND

[0002] In the production of cable protection pipes, the production raw material is usually plastic particles (PVC, PE, CPVC, etc.), and dust will inevitably be generated in the feeding and loading process, that is, when the plastic particles are fed from the storage bin into the hopper of the extruder. If the raw material used is a powdered premix, the amount of dust will be even larger due to the fine debris generated by friction during the transportation and storage of the raw material. Although these dusts are particulate matters, they will mix with the organic waste gas (VOCs) generated during the melting and extrusion process to form gas-solid mixed pollutants. Therefore, during waste gas purification treatment, the dust particles in the waste gas need to be filtered out using a bag filter first, and then the organic waste gas is adsorbed by an activated carbon adsorption device.

[0003] In the use of the existing bag filter, a back blowing system is needed to use back blowing airflow to remove the dust attached to the outer surface of the filter bag to prevent the dust attached to the surface of the filter bag from affecting the treatment efficiency. However, after back blowing, the fine dust separated from the filter bag still gathers near the filter bag, and when the waste gas treatment is performed again, this part of dust will reattach to the filter bag along with the airflow of the waste gas, which leads to poor effect of back blowing to clean the dust on the surface of the filter bag. In addition, because the dust cleaned by back blowing is still located below the filter bag, this part of dust is also easy to reattach to the filter bag along with the subsequent flow of waste gas, which affects the purification treatment efficiency of the waste gas. SUMMARY

[0004] The present application provides a waste gas purification treatment equipment for underground cable protection pipe production equipment, which has the advantage that the dust cleaned by back blowing is not easy to reattach to the filter bag, so as to solve the problem that the dust is easy to reattach to the filter bag after back blowing in the existing equipment when filtering the dust in the waste gas, which affects the subsequent filtering efficiency.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a waste gas purification treatment equipment for underground cable protection pipe production equipment, comprising a dust removal box, a filter bag and an air outlet pipe are connected to the two sides of the dust removal box respectively, a back blowing airflow guide pipe is arranged above the filter bag, a back blowing jet pipe corresponding to the filter bag is arranged at the bottom of the back blowing airflow guide pipe, the back blowing airflow guide pipe is communicated with a back blowing airflow input pipe, a mounting plate is fixedly installed in the interior of the dust removal box, a plurality of filter bags are fixedly installed at the bottom of the mounting plate, a separation and dust removal device is arranged in the interior of the dust removal box, the separation and dust removal device is located below the communication port of the air inlet pipe and the dust removal box, and the separation and 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 separation and dust removal device and the inner wall of the dust removal box.

[0006] The isolation dust removal device comprises 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 on both sides of the filter cartridge.

[0007] The sealing device includes a second sealing block that is sealed with the positioning rotating plate, and a first sealing block that is sealed with 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 in contact with the inner wall of the dust removal box, and the outer arc wall of the sealing ring is movably fitted with the inner arc wall of the second sealing block and the first sealing block.

[0008] Each time the dust on the surface of the filter bag is backblown, the backblown airflow drives the dust in the dust collector to flow through the filter cartridge, which is filtered and intercepted by the filter cartridge. The servo motor drives the filter cartridge to rotate half a circle, so that the dust on the surface of the filter cartridge falls to the bottom of the dust collector cavity.

[0009] Furthermore, the two positioning rotating plates are fixedly connected with positioning rotating shafts on one side facing the inner wall of the dust removal box, and the two positioning rotating shafts are respectively connected to the two side walls of the dust removal box through bearings. The output rotating shaft of the servo motor is fixedly connected to one of the positioning rotating shafts, and the two positioning rotating shafts are connected to the inner wall of the dust removal box through bearings, so as to support and fix the isolation dust removal device as a whole, and does not affect the servo motor driving the output rotating shaft to drive the isolation dust removal device to rotate.

[0010] The dust collecting bag and the like are then removed from the filter bag by the user, thereby removing the dust collecting bag from the filter bag and causing it to adhere to the filter bag's surface.

[0011] Furthermore, a number of connecting rods distributed 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 rods arranged equidistantly are fixedly installed between the connecting rods. The filter cartridge is mounted on the outside of the arc rods, and a cylindrical frame is spliced ​​together by a number of connecting rods and arc rods, so that the surface of the filter cartridge mounted on the frame is flattened, which is conducive to airflow through the filter cartridge and filtering dust.

[0012] Further, the arc-shaped positioning block is provided with a groove facing the filter cartridge, which is beneficial for the large particles in the exhaust gas to slide into the groove through the surface of the filter cartridge without affecting the airflow passing through the surface of the filter cartridge and intercepting smaller particles.

[0013] Further, the sealing device further comprises two limiting plates arranged above and below, the limiting plates are fixedly installed on the inner wall of the dust removal box through L-shaped fixing frames, a limiting frame facing one side of the filter cartridge is fixedly installed between the two limiting plates, and 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 be in close contact with the filter cartridge on one side of the filter cartridge to form a seal.

[0014] Further, the two sides of the filter cartridge and the first sealing block opposite to each other are uniformly and smoothly chamfered, so that the first sealing block can form a close seal with the filter cartridge, and at the same time, when the filter cartridge rotates relative to the first sealing block, the filter cartridge can pass through the first sealing block.

[0015] Further, two arc-shaped frames are fixedly installed between the two upper limiting plates on the two sides of the second sealing block, and the two arc-shaped frames are arranged at the two ends of the limiting plates. The second sealing block is arranged on the inner side of the arc-shaped frame. Through the fixed arrangement of the arc-shaped frame, the second sealing block fixedly arranged on the inner side of the arc-shaped frame is in close contact with the positioning rotating plate to form an effective seal, so that the airflow of the back blowing can flow through the filter cartridge, and the rotation of the positioning rotating plate will not affect the second sealing block, thereby affecting the sealing performance of the second sealing block and the filter cartridge.

[0016] Further, the dust removal box is fixedly provided with a cleaning device below one of the sealing devices, the cleaning device comprises a limiting plate, the limiting plate is close to but not in contact with the positioning rotating plate and the sealing device, and limiting shafts are fixedly installed at the two ends of the limiting plate, respectively. The two limiting shafts are fixedly connected with the two inner walls of the dust removal box, respectively. 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 with the surface of the filter cartridge. When the filter cartridge rotates, the cleaning brush is used to clean the dust attached to the surface of the filter cartridge, so that the dust falls to the bottom of the inner cavity of the dust removal box for collection and treatment. In cooperation with the back blowing stage, the exhaust capacity of the exhaust groove is limited, and the back blowing airflow flows downward to act on the filter cartridge below, which is beneficial for the dust attached to the surface of the filter cartridge to further fall off.

[0017] Further, the inner wall of the dust removal box is fixedly provided with two first flow guide blocks above the two sealing devices, the top of the first flow guide block is designed as an inclined surface, and one end of the first flow guide block extends above the arc-shaped positioning block, the dust removal box is fixedly provided with two second flow guide blocks inside, the two second flow guide blocks are arranged vertically with the first flow guide blocks, the top of the second flow guide block is designed as an inclined surface, and the top of the second flow guide block extends above the filter cartridge, through the structural arrangement of the first flow guide block and the second flow guide block, the dust particles falling near the inner wall of the dust removal box can roll into the groove, and when the filter cartridge rotates around the arc-shaped positioning block, the dust particles collected in the groove fall to the bottom of the inner cavity of the dust removal box.

[0018] The present application has the following advantages:

[0019] 1、The underground cable protection pipe production equipment waste gas purification treatment equipment provided by the present application is provided with a filter cartridge below the communication port between the air inlet pipe and the dust removal box, when the surface of the filter bag is cleaned by back blowing each time, the back blowing airflow drives the dust in the dust removal box to flow through the filter cartridge, and the dust separated from the filter bag after back blowing flows to the filter cartridge along the back blowing airflow, so as to adhere to the filter cartridge, thereby preventing the dust particles after back blowing from adhering to the filter bag again, affecting the subsequent waste gas passing through the filter bag, and improving the efficiency of waste gas treatment.

[0020] 2、By rotating the part of the filter cartridge adhering to the dust to the lower side and cooperating with the sealing isolation of the sealing device, the dust cleaned on the filter bag after back blowing cannot flow to the filter bag along the airflow of the waste gas, thereby avoiding the situation that the dust adheres to the filter bag again, and further improving the efficiency of waste gas treatment. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings:

[0022] Figure 1 It is a structural schematic diagram of the present application;

[0023] Figure 2 It is a structural schematic diagram of the dust removal box inside the present application;

[0024] Figure 3 It is Figure 2 a front view;

[0025] Figure 4 It is Figure 2 a structural schematic diagram of the isolation dust removal device and the sealing device in the present application;

[0026] Figure 5 is a front view of Figure 4 ;

[0027] Figure 6 is a sectional view of the structure at a-a in Figure 4 ;

[0028] Figure 7 is a sectional view of the structure at b-b in Figure 4 ;

[0029] Figure 8 is a structural schematic view of the cleaning device in Figure 2 .

[0030] In the figure: 1, dust removal box; 2, mounting plate; 3, filter bag; 4, air inlet pipe; 5, air outlet pipe; 6, back flushing airflow guide pipe; 7, back flushing airflow input pipe; 8, isolation dust removal device; 801, positioning rotary plate; 8011, exhaust groove; 802, positioning rotary shaft; 803, connecting rod; 804, arc-shaped rod; 805, filter cartridge; 806, arc-shaped positioning block; 8061, groove; 9, sealing device; 901, limiting plate; 902, limiting frame; 903, first sealing block; 904, arc-shaped 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 flow guide block; 14, second flow guide block. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] Embodiments, such as Figures 1-3, an exhaust gas purification and treatment equipment for underground cable protection pipe production equipment, including a dust removal box 1, a mounting plate 2 is fixedly installed inside the dust removal box 1, a number of filter bags 3 are arranged under the mounting plate 2, one side of the dust removal box 1 is connected to an air inlet pipe 4, and the connecting port between the air inlet pipe 4 and the dust removal box 1 is located below the bottom end of the filter bag 3, the other side of the dust removal box 1 is connected to an air outlet pipe 5, and the connecting port between the air outlet pipe 5 and the dust removal box 1 is located above the mounting plate 2. The exhaust gas generated when the cable protection pipe is produced in the factory enters the interior of the dust removal box 1 through the air inlet pipe 4, passes through the filter bag 3 filters out dust particles in the exhaust gas, and the exhaust gas with dust filtered out flows to the next-level processing equipment through the exhaust pipe 5. The interior of the dust removal box 1 is provided with a plurality of 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 jet air enters through the back-blowing airflow input pipe 7 and is divided into each back-blowing airflow duct 6, and is ejected 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] See also Figures 1-2 、 Figures 4-7 , the interior of the dust removal box 1 is provided with an isolation dust removal device 8 located below the communication port between the air inlet pipe 4 and the dust removal box 1, and sealing devices 9 are provided on both sides of the isolation dust removal device 8. The isolation dust removal device 8 includes two positioning rotating plates 801, and the two positioning rotating plates 801 are fixedly connected to the positioning rotating shafts 802 on one side facing the inner wall of the dust removal box 1, and the two positioning rotating shafts 802 are respectively connected to the two side walls of the dust removal box 1 through bearings, so that the two positioning rotating shafts 802 and the positioning rotating plate 801 can rotate relative to the dust removal box 1, and a servo motor 10 is fixedly installed on the front side of the dust removal box 1, and the output rotating shaft of the servo motor 10 is fixedly connected to one of the positioning rotating shafts 802. The output rotating shaft is driven by the servo motor 10 to drive the positioning rotating shaft 802 and the positioning rotating plate 801 to rotate, and an exhaust groove 801 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 the external pipeline for discharging back-blowing air (because the pipeline is in Figures 1-3 The back of the figure shown in the figure, and the exhaust pipe is commonly known and therefore not drawn and will not be described in detail) and a solenoid valve is provided on the pipe for discharging the back-blowing airflow. When the back-blowing airflow removes the dust attached to the outer surface of the filter bag 3, the solenoid valve on the pipe for discharging the back-blowing airflow opens to discharge the back-blowing airflow.

[0034] Several connecting rods 803 distributed in a circular array are fixedly installed between the two positioning rotating plates 801, and the connecting rods 803 are close to the outer edge of the positioning rotating plate 801. Arc rods 804 arranged equidistantly are fixedly installed between the several connecting rods 803. A filter cartridge 805 located on the outside of the arc rod 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 arranged on both sides of the filter cartridge 805, and the inner arc wall of the arc-shaped positioning block 806 is in contact with the outer arc wall of the filter cartridge 805. A groove 8061 facing the filter cartridge 805 is provided 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 upper and lower limit plates 901, which are fixedly installed on the inner wall of the dust removal box 1. A limit frame 902 facing the filter cartridge 805 is fixedly installed between the two limit plates 901. A first sealing block 903 is fixedly installed on the limit frame 902. One side of the first sealing block 903 is movably fitted with the outer arc wall of the filter cartridge 805, and the two sides of the opposite sides of the filter cartridge 805 and the first sealing block 903 are evenly and smoothly chamfered, so that the filter cartridge 805 can move with the arc rod 804, the connecting rod 803, 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 with the first sealing block 903, a seal is formed at the fitting portion 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 arranged at both ends of the limiting plates 901. The second sealing blocks 905 are arranged on the inner side of the arc-shaped frames 904. The second sealing blocks 905 inside the two arc-shaped frames 904 are respectively The outer arc wall of the two positioning rotating plates 801 is movably fitted to form a seal, and a sealing ring 11 is fixedly installed on the outer side of the positioning rotating plate 801. The side of the sealing ring 11 away from the positioning rotating plate 801 is movably fitted to the inner wall of the dust removal box 1 to form a seal, and the outer arc wall of the sealing ring 11 is movably fitted to the inner arc wall of the second sealing block 905 and the first sealing block 903 to form a seal. Therefore, through the sealing arrangement of the sealing device 9 and the sealing ring 11, when cleaning the dust attached to the surface of the filter bag 3 during backblowing, the airflow passes through the upper half of the filter cartridge 805 and passes from The exhaust slot 8011 is discharged, so that the downward back-blowing airflow is conducive to driving the dust to move downward and adhere to the surface of the filter cartridge 805. After the back-blowing is completed, the servo motor 10 drives the output shaft to drive the positioning rotary plate 801, the two positioning rotary shafts 802 and the filter cartridge 805 to rotate half a circle, and the upper and lower positions of the surface of the filter cartridge 805 are swapped, so that the part of the filter cartridge 805 that absorbs dust rotates downward, thereby preventing this part of the dust from re-attaching to the surface of the filter bag 3 along with the upward airflow of the exhaust gas during the subsequent treatment of the exhaust gas after the back-blowing is completed.

[0036] See alsoFigures 2-4 、 Figure 8 The inside of the dust removal box 1 is fixedly provided with a cleaning device 12 below one of the sealing devices 9. The cleaning device 12 comprises a limiting plate 121 which is close to but not in contact with the one of the sealing devices 9 and the positioning rotating plate 801. Two limiting shafts 122 are fixedly connected to the two ends of the limiting plate 121 and are fixedly connected to the inner walls of the dust removal box 1. A cleaning brush 123 is fixedly connected to 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 cylinder 805. When the filter cylinder 805 rotates, the cleaning brush 123 is used to clean the dust attached to the surface of the filter cylinder 805, so that the dust falls to the bottom of the inner cavity of the dust removal box 1 for collection and treatment. In combination with the back blowing stage and the exhaust capacity limitation of the exhaust groove 8011, the downward flowing back blowing air acts on the filter cylinder 805 below, which is beneficial to further falling of the dust attached to the surface of the filter cylinder 805.

[0037] The inner wall of the dust removal box 1 is fixedly provided with two first flow guide blocks 13 which are located above the two sealing devices 9. The top of the first flow guide block 13 is designed as an inclined surface, and one end of the first flow guide block 13 extends above the arc-shaped positioning block 806. The inside of the dust removal box 1 is fixedly provided with two second flow guide blocks 14 which are arranged perpendicularly to the first flow guide blocks 13. The top of the second flow guide block 14 is designed as an inclined surface, and the top of the second flow guide block 14 extends above the filter cylinder 805. Through the structural arrangement of the first flow guide blocks 13 and the second flow guide blocks 14, the dust particles falling near the inner wall of the dust removal box 1 can roll into the groove 8061, and then the dust particles collected in the groove 8061 fall to the bottom of the inner cavity of the dust removal box 1 when the filter cylinder 805 rotates around the arc-shaped positioning block 806.

[0038] During use, the exhaust gas generated when producing cable protection tubes in the factory enters the dust removal box 1 through the air inlet pipe 4, and the dust particles in the exhaust gas are filtered out by the filter bag 3. The exhaust gas with dust filtered out flows to the next level of treatment equipment through the air outlet pipe 5. As the exhaust gas treatment proceeds, a large amount of dust will adhere to the surface of the filter bag 3, and the channel for the exhaust gas to enter through the air inlet pipe 4 is closed, so that the backwash airflow enters through the backwash airflow input pipe 7 and is diverted to each backwash airflow duct 6. The backwash nozzle set at the bottom of the backwash airflow duct 6 is sprayed to the inside of each filter bag 3, and the backwash airflow is The interior of the filter bag 3 is sprayed outward to remove the dust attached to the outer surface of the filter bag 3. At the same time, the back-blown airflow flows through the surface of the filter cartridge 805 and is discharged from the exhaust slot 8011. The flow of the back-blown airflow is used to drive 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 drive the positioning shaft 802, the two positioning rotating plates 801 and the filter cartridge 805 to rotate half a circle, so that the side of the filter cartridge 805 that absorbs dust rotates downward, thereby allowing the dust to fall to the bottom of the inner cavity of the dust removal box 1.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An underground cable protection pipe production equipment exhaust gas purification treatment equipment, comprising a dust removal box, a filter bag and an air outlet pipe are connected to both sides of the dust removal box respectively, a back blowing airflow guide pipe is arranged above the filter bag, a back blowing jet pipe is arranged at the bottom of the back blowing airflow guide pipe, the back blowing airflow guide pipe is communicated with a back blowing airflow input pipe, a mounting plate is fixedly installed inside the dust removal box, and a plurality of filter bags are fixedly installed at the bottom of the mounting plate, characterized in that, The inside of the dust removal box is provided with an isolation dust removal device, which is located below the air inlet pipe and 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. The isolation dust removal device comprises two positioning rotary plates, a filter cartridge and two arc-shaped positioning blocks arranged between the two positioning rotary plates. The sealing device comprises a second sealing block in sealing contact with the positioning rotary plate and a first sealing block in sealing contact with the arc-shaped positioning block, a sealing ring is fixedly installed on the outer side of the positioning rotary plate, the side of the sealing ring away from the positioning rotary plate is in sealing contact with the inner wall of the dust removal box, and the outer arc wall of the sealing ring is in sealing contact with the inner arc wall of the second sealing block and the first sealing block. When the surface of the filter bag is cleaned by reverse blowing each time, the dust in the dust removal box is driven by the reverse blowing airflow to flow through the filter cartridge, and after the reverse blowing is completed, the filter cartridge is driven by the servo motor to rotate by half a circle, so that the dust on the surface of the filter cartridge falls to the bottom of the inner cavity of the dust removal box.

2. The exhaust gas purification treatment apparatus for an underground electric cable protection pipe production apparatus according to claim 1, characterized by, The side of each of the two positioning rotary plates facing the inner wall of the dust removal box is fixedly connected with a positioning rotary shaft, and the two positioning rotary shafts are connected with the two side walls of the dust removal box through bearings.

3. The exhaust gas purification treatment apparatus for an underground electric cable protection pipe production apparatus according to claim 2, characterized by, The middle part of the other positioning rotary plate and the positioning rotary shaft is provided with an exhaust groove, which is in communication with a pipeline outside the dust removal box for discharging the reverse blowing airflow.

4. The exhaust gas purification treatment apparatus for an underground electric cable protection tube production apparatus according to claim 1, characterized by, A plurality of circumferentially arranged connecting rods are fixedly installed between the two positioning rotary plates, and the connecting rods are close to the outer edges of the positioning rotary plates.

5. The exhaust gas purification treatment apparatus for an underground electric cable protection tube production apparatus according to claim 1, characterized by, The arc-shaped positioning block is provided with a groove facing the filter cartridge.

6. The exhaust gas purification treatment apparatus for an underground electric cable protection tube production apparatus according to claim 1, characterized by The sealing device further comprises two limiting plates arranged above and below, which are fixedly installed on the inner wall of the dust removal box, a limiting frame facing one side of the filter cartridge is fixedly installed between the two limiting plates, and the first sealing block is fixedly installed on one side of the limiting frame.

7. The exhaust gas purification treatment apparatus for a buried cable protection pipe production apparatus according to claim 6, characterized by, The opposite sides of the filter cartridge and the first sealing block are uniformly and smoothly chamfered.

8. The exhaust gas purification treatment apparatus for the underground electric cable protection tube production apparatus according to claim 6, characterized by, Two arc-shaped frames are fixedly installed between the two upper limiting plates on the two sides of the second sealing block, the two arc-shaped frames are separately arranged at the two ends of the limiting plates, and the second sealing block is arranged on the inner side of the arc-shaped frames.

9. The exhaust gas purification treatment apparatus for an underground electric cable protection tube production apparatus according to Claim 1, characterized by, A cleaning device is fixedly installed below one of the sealing devices in the dust removal box, the cleaning device comprises a limiting plate, the limiting plate is close to but not in contact with the positioning rotary plate and the one sealing device, limiting shafts are fixedly installed at the two ends of the limiting plate, the two limiting shafts are fixedly connected with the two inner walls of the dust removal box, a cleaning brush is fixedly installed on one side of the limiting plate, and one end of the cleaning brush away from the limiting plate is movably connected with the surface of the filter cartridge.

10. The exhaust gas purification treatment apparatus for an underground electric cable protection tube production apparatus according to Claim 1, characterized by Two first flow guide blocks are fixedly installed on the inner wall of the dust removal box, the two first flow guide blocks are located above the two sealing devices, the top of the first flow guide block is designed as a slope, and one end of the first flow guide block extends above the arc-shaped positioning block, two second flow guide blocks are fixedly installed in the dust removal box, the two second flow guide blocks are arranged perpendicularly to the first flow guide blocks, the top of the second flow guide block is designed as a slope, and the top of the second flow guide block extends above the filter cartridge.

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