A closed pit pool for waste gas treatment system

Abstract

The present invention belongs to the field of waste liquid and waste gas treatment, and in particular relates to a closed pit tank for waste gas treatment system, which includes a pit tank, a liquid storage tank, a slope, a platform, a cover plate, a liquid pump, a liquid extraction pipe, and a dredging mechanism, wherein the bottom of the liquid storage tank in the pit tank is a slope connected to the operating platform in the pit tank, and the liquid storage tank is provided with an inclined cover plate above the liquid storage tank to cover it and facilitate the upward concentration of waste gas in the waste liquid, and a structure for exhausting waste gas and injecting waste liquid into the liquid storage tank is installed at the waste gas concentration part of the cover plate. After effectively stirring the waste liquid in the liquid storage tank and effectively dredging the bottom of the liquid storage tank, the dredging mechanism moves to the platform outside the liquid storage tank, thereby facilitating maintenance personnel to repair and maintain the dredging mechanism in a state isolated from the liquid storage tank. At the same time, equipment such as the liquid pump and the motor are located above the platform, thereby preventing maintenance personnel from suffocating when repairing equipment in a space filled with waste gas.

Description

Technical Field

[0001] The present invention belongs to the field of waste liquid and waste gas treatment, and in particular relates to a closed pit pool of a waste gas treatment system. Background Art

[0002] In the treatment of waste liquid and waste gas, the waste liquid pool for treating waste liquid has to be designed as a pit pool due to space limitations. The waste gas generated by the waste liquid in the pit pool makes it difficult for personnel to go down to the pool for maintenance and inspection. Workers entering the pit pool are prone to suffocation due to lack of oxygen. Therefore, the pit pool is designed to be closed, and the liquid extraction pump is moved above the cover of the pit pool to facilitate maintenance of the liquid extraction pump.

[0003] After prolonged use, wastewater tanks accumulate sediment at the bottom, requiring regular scraping, cleaning, and stirring to promote wastewater circulation. Because the stirring and scraping equipment is located within the wastewater tank, maintenance requires personnel to enter the pit, which is unsafe in a pit filled with waste gas.

[0004] In addition, the outlet of the extraction pipe used to extract liquid from the waste liquid pool is clogged due to the filter screen, which also requires workers to go down to the pit to clean it and poses a safety hazard.

[0005] The present invention designs a closed pit pool for waste gas treatment system. By improving the pit pool structure, the related equipment involved can be moved outside the pit pool when maintenance is required, thereby ensuring the safety of maintenance personnel. Summary of the Invention

[0006] In order to solve the above-mentioned defects in the prior art, the present invention discloses a closed pit pool of an exhaust gas treatment system, which is realized by adopting the following technical solutions.

[0007] A closed pit pool for waste gas treatment system comprises a pit pool, a liquid storage tank, a slope, a platform, a cover plate, a liquid pump, a liquid extraction pipe and a dredging mechanism, wherein the bottom of the liquid storage tank in the pit pool is a slope connected to the operating platform in the pit pool, and an inclined cover plate is provided above the liquid storage tank for sealing the liquid storage tank and facilitating the upward concentration of waste gas in the waste liquid, and a structure for discharging waste gas and injecting waste liquid into the liquid storage tank is installed at the waste gas concentration part of the cover plate; the cover plate has a structure for always keeping the liquid storage tank in a sealed state during the process of the dredging mechanism for cleaning sediment at the bottom of the liquid storage tank and stirring waste liquid entering and exiting the liquid storage tank from the platform; a liquid extraction pipe is installed in the installation groove on the inner wall of the pit pool and is driven by a liquid pump on the step above the platform to extract waste liquid from the liquid storage tank; the end of the liquid extraction pipe has a filtering structure for filtering the waste liquid entering therein and a cleaning structure for automatically cleaning the filtering structure.

[0008] As a further improvement of the present technology, an exhaust pipe for discharging the exhaust gas and a liquid adding pipe for injecting waste liquid into the liquid storage tank are installed at the exhaust gas collection point of the cover plate.

[0009] As a further improvement of this technology, there is a gap between the lower end of the cover plate and the platform to allow the dredging mechanism to enter and exit the liquid storage tank from the platform. A sealing curtain composed of hard bristles is installed at the lower end of the cover plate to seal the gap between it and the platform.

[0010] As a further improvement of the present technology, the end of the liquid extraction tube is equipped with a square sleeve connected to it, and a square column A is sliding in the square sleeve along the axis of the liquid extraction tube; a rotating shaft A is rotatably matched in the circular groove in the middle of the square column A, which moves axially under the drive of the electric push rod and rotates under the drive of the motor, and the motor and the electric push rod are both located above the platform; the end of the rotating shaft A is equipped with a square column B that slides with the inner wall of the square sleeve; the four side walls of the square column B are each provided with a liquid trough B corresponding to the liquid trough A on the square column A that passes through both ends, and the liquid trough B is densely covered with filter wool for secondary filtration of the waste liquid entering the liquid extraction tube through the liquid trough B and the liquid trough A; the end of the square sleeve is hinged with two filter forks for primary filtration of the waste liquid entering it through a swing shaft, and the end of the square column B is equipped with a cleaning fork that cleans the residue attached to the filter fork by cooperating with the two filter forks, and two vortex springs A are matched between the swing shaft and the square sleeve where each cleaning fork is located to reset its swing.

[0011] As a further improvement of the present technology, the rotating shaft A is sealed with a circular groove on the wall of the liquid extraction tube; the exposed part of the rotating shaft A is rotatably fitted with a rotating seat which moves axially along the rotating shaft A under the drive of an electric tow rod, and a motor is installed on the rotating seat. The gear B installed on the motor output shaft is engaged with the gear A installed on the exposed end of the rotating shaft A.

[0012] As a further improvement of the present technology, the dredging mechanism includes a pull rope, a U frame, a spring A, a sleeve, a roller A, a roller B, a ring sleeve, a scraper, a rubber strip, a rotating shaft B, a cam column, a vortex spring B, a gear C, a synchronization rod, and a rack, wherein the two branches of the U frame are respectively nested with sliding sleeves, and the sliding sleeves are installed with springs A for sliding and resetting them on the U frame; the U frame is provided with a pull rope; a roller A and a hollow roller B parallel to the roller A are installed between the two sleeves, and the ring sleeves at both ends of the roller B rotate in the circular grooves at the ends of the corresponding sleeves respectively, and there is a ring sleeve between the sleeve and the circular groove of the sleeve. The structure does not restrict the rotation of roller A when roller A moves downward along the slope of the liquid storage tank, and restricts the rotation of roller A when roller A moves upward along the slope of the liquid storage tank; a cam column is installed in roller A through a rotating shaft B that rotates with the ring sleeve, and two vortex springs B are matched between the rotating shaft B and roller A to reset its rotation; the cam column is matched with scrapers that slide radially along roller A in several sliding grooves A on the rim of roller A, and the width of the scraper matches the width of the slope; synchronization rods are respectively installed on the two branches of the U frame, and the rack on the synchronization rod meshes with the gear C on the corresponding end of the rotating shaft B.

[0013] As a further improvement of this technology, the scraper is installed with a limit strip to prevent it from radially separating from the roller A, and the exposed end of the scraper is installed with a rubber strip to prevent it from completely entering the roller A and reduce scraper wear.

[0014] As a further improvement of the present technology, the outer edge of the ring sleeve is provided with an annular groove, and a block A is provided in the sliding groove B on the inner wall of the annular groove, which slides radially along the ring sleeve and cooperates with the block B on the inner wall of the circular groove of the corresponding sleeve, and a spring B is installed to reset the block A; the block A has an inclined surface that does not restrict the rotation of the roller A when the roller A moves downward along the slope.

[0015] Compared with traditional waste liquid and waste gas treatment pits, the slope at the bottom of the liquid storage tank of the present invention can facilitate the dredging mechanism to smoothly enter and exit the liquid storage tank and facilitate the dredging mechanism to clean the sediment at the bottom of the liquid storage tank. The dredging mechanism effectively stirs the waste liquid during its movement along the slope toward the liquid storage tank and effectively scrapes and cleans the sediment at the bottom of the liquid storage tank during its upward movement along the slope.

[0016] After effectively stirring the waste liquid in the liquid storage tank and effectively desilting the bottom of the liquid storage tank, the dredging mechanism moves to the platform outside the liquid storage tank, so that maintenance personnel can repair and maintain the dredging mechanism in isolation from the liquid storage tank. At the same time, equipment such as liquid pumps and motors are located above the platform, thereby avoiding suffocation caused by maintenance personnel repairing equipment in a space filled with exhaust gas.

[0017] The structure at the end of the liquid extraction pipe in the present invention can automatically clean the residue attached to the two filter forks at the end of the square sleeve under the drive of the motor and the electric push rod after effectively filtering the waste liquid entering the liquid extraction pipe, thereby preventing the residue in the waste liquid from clogging the liquid extraction pipe.

[0018] The invention has a simple structure and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall cross-sectional schematic diagram of the present invention.

[0020] Figure 2 It is a schematic cross-sectional view of the waste liquid pool.

[0021] Figure 3 It is a schematic diagram of the dredging mechanism from two perspectives.

[0022] Figure 4 It is a cross-sectional diagram of the cooperation among roller B, cam column and scraper.

[0023] Figure 5 It is a cross-sectional diagram of the matching between the ring sleeve on roller B and the circular groove on the sliding sleeve.

[0024] Figure 6These are two cross-sectional schematic diagrams of the cooperation of the U-frame, sliding sleeve, roller A, roller B, cam column and rotating shaft B on the dredging mechanism.

[0025] Figure 7 It is a schematic diagram of a partial cross-section of roller B.

[0026] Figure 8 It is a partial cross-sectional schematic diagram of the liquid extraction tube and its two ends.

[0027] Figure 9 It is a cross-sectional diagram of the filter fork and the square sleeve.

[0028] Figure 10 This is a schematic diagram of the coordination of square column A, rotating shaft A, square column B and cleaning fork.

[0029] Names of the symbols in the figure: 1. pit pool; 2. liquid storage tank; 3. slope; 4. platform; 5. installation groove; 6. cover plate; 7. exhaust pipe; 8. liquid adding pipe; 9. liquid pump; 10. liquid extraction pipe; 11. square sleeve; 12. filter fork; 13. swing shaft; 14. vortex spring A; 15. square column A; 16. liquid tank A; 17. rotating shaft A; 18. square column B; 19. liquid tank B; 20. filter hair; 21. cleaning fork; 22. rotating seat; 23. electric push rod; 24. gear A; 25. gear B; 26. motor; 27. dredging mechanism ; 28. Pull rope; 29. U-frame; 30. Spring A; 31. Sleeve; 32. Roller A; 33. Roller B; 34. Slide A; 35. Sleeve; 36. Ring groove; 37. Slide B; 38. Guide groove; 39. Ring; 40. Block A; 41. Inclined surface; 42. Guide block; 43. Spring B; 44. Block B; 45. Scraper; 46. Limit strip; 47. Rubber strip; 48. Rotating shaft B; 49. Cam column; 50. Vortex spring B; 51. Gear C; 52. Synchronous rod; 53. Rack; 54. Sealing curtain. DETAILED DESCRIPTION

[0030] The accompanying drawings are schematic diagrams of the present invention to facilitate understanding of the structural operation principle. The specific product structure and proportional dimensions can be determined according to the use environment and conventional technology.

[0031] like Figure 1 As shown, it includes a pit pool 1, a liquid storage tank 2, a slope 3, a platform 4, a cover plate 6, a liquid pump 9, a liquid extraction pipe 10, and a dredging mechanism 27, wherein Figure 1 、 2As shown in Figures 8 and 8, the bottom of the liquid storage tank 2 in the pit pool 1 is a slope 3 connected to the operating platform 4 in the pit pool 1. The top of the liquid storage tank 2 is provided with an inclined cover plate 6 for sealing it and facilitating the upward concentration of waste gas in the waste liquid. The waste gas concentration part of the cover plate 6 is equipped with a structure for discharging waste gas and injecting waste liquid into the liquid storage tank 2; the cover plate 6 has a structure for keeping the liquid storage tank 2 in a sealed state during the process of the silting mechanism 27 for cleaning the sediment at the bottom of the liquid storage tank 2 and stirring the waste liquid entering and exiting the liquid storage tank 2 from the platform 4; a liquid extraction pipe 10 for extracting the waste liquid in the liquid storage tank 2 under the drive of the liquid pump 9 on the step above the platform 4 is installed in the installation groove 5 on the inner wall of the pit pool 1; the end of the liquid extraction pipe 10 has a filtering structure for filtering the waste liquid entering it and a cleaning structure for automatically cleaning the filtering structure.

[0032] like Figure 1 As shown, an exhaust pipe 7 for discharging the exhaust gas and a liquid adding pipe 8 for injecting waste liquid into the liquid storage tank 2 are installed at the exhaust gas collection point of the cover plate 6.

[0033] like Figure 1 As shown, there is a gap between the lower end of the cover plate 6 and the platform 4 to allow the dredging mechanism 27 to enter and exit the liquid storage tank 2 from the platform 4. A sealing curtain 54 composed of hard bristles is installed at the lower end of the cover plate 6 to seal the gap between it and the platform 4.

[0034] like Figure 1 、 8 As shown in Figure 10, the end of the liquid extraction tube 10 is equipped with a square sleeve 11 connected thereto, and a square column A15 is slidably provided in the square sleeve 11 along the axis of the liquid extraction tube 10; a rotating shaft A17 is rotatably fitted in the circular groove in the middle of the square column A15, which moves axially under the drive of the electric push rod 23 and rotates under the drive of the motor 26, and the motor 26 and the electric push rod 23 are both located above the platform 4; a square column B18 is slidably fitted with the inner wall of the square sleeve 11 on the end of the rotating shaft A17; the four side walls of the square column B18 are provided with There are liquid troughs B19 corresponding to the liquid troughs A16 running through both ends of the square column A15. The liquid troughs B19 are densely covered with filter wool 20 for secondary filtration of the waste liquid entering the liquid extraction pipe 10 through the liquid troughs B19 and the liquid troughs A16. The end of the square sleeve 11 is hingedly connected to two filter forks 12 for primary filtration of the waste liquid entering it through the swing shaft 13. The end of the square column B18 is equipped with a cleaning fork 21 that cooperates with the two filter forks 12 to clean the residue attached to the filter forks 12. Figure 8 、 9 As shown, two vortex springs A14 are fitted between the swing shaft 13 and the square sleeve 11 where each cleaning fork 21 is located to reset its swing.

[0035] like Figure 8As shown, the rotating shaft A17 is sealed with the circular groove on the wall of the liquid extraction tube 10; the exposed part of the rotating shaft A17 is rotatably matched with a rotating seat 22 which moves axially along the rotating shaft A17 under the drive of the electric tow bar, and a motor 26 is installed on the rotating seat 22. The gear B25 installed on the output shaft of the motor 26 is engaged with the gear A24 installed on the exposed end of the rotating shaft A17.

[0036] like Figure 3 、 4 As shown in Figure 6, the desilting mechanism 27 includes a pull rope 28, a U frame 29, a spring A30, a sleeve 31, a roller A32, a roller B33, a ring 35, a scraper 45, a rubber strip 47, a rotating shaft B48, a cam column 49, a vortex spring B50, a gear C51, a synchronization rod 52, and a rack 53, wherein Figure 6 As shown, the two branches of the U frame 29 are respectively nested with sliding sleeves 31, and the sliding sleeves 31 are installed with springs A30 for sliding and returning them on the U frame 29; Figure 3 As shown, the U frame 29 has a pull rope 28; Figure 5 、 6 As shown, a roller A32 and a hollow roller B33 parallel to the roller A32 are installed between the two sleeves 31, and the ring sleeves 35 at both ends of the roller B rotate in the circular grooves at the ends of the corresponding sleeves 31 respectively. There is a structure between the ring sleeve 35 and the circular groove of the sleeve 31 that does not restrict the rotation of the roller A32 when the roller A32 moves downward along the slope 3 of the liquid reservoir 2, and restricts the rotation of the roller A32 when the roller A32 moves upward along the slope 3 of the liquid reservoir 2; a cam column 49 is installed in the roller A32 through a rotating shaft B48 that rotates with the ring sleeve 35, and two vortex springs B50 are matched between the rotating shaft B48 and the roller A32 to reset its rotation; as shown Figure 3 、 4 As shown in Figures 7 and 8, the cam column 49 cooperates with the scraper 45 that slides radially along the roller A32 in the several sliding grooves A34 on the rim of the roller A32, and the width of the scraper 45 matches the width of the slope 3; a synchronization rod 52 is respectively installed on the two branches of the U frame 29, and the rack 53 on the synchronization rod 52 meshes with the gear C51 on the corresponding end of the rotating shaft B48.

[0037] like Figure 4 As shown, the scraper 45 is installed with a limiting strip 46 to prevent it from radially separating from the roller A32, and the exposed end of the scraper 45 is installed with a rubber strip 47 to prevent it from completely entering the roller A32 and reduce the wear of the scraper 45.

[0038] like Figure 5 、 7As shown, the outer edge of the ring sleeve 35 has an annular groove 36, and a block A40 that cooperates with the block B44 on the inner wall of the circular groove of the corresponding sleeve 31 slides radially along the ring sleeve 35 in the sliding groove B37 on the inner wall of the annular groove 36, and is installed with a spring B43 for resetting the block A40; the block A40 has an inclined surface 41 that does not restrict the rotation of the roller A32 when the roller A32 moves downward along the slope 3.

[0039] like Figure 5 、 7 As shown, the clamping block A40 has two guide blocks 42, which slide in two guide grooves 38 on the inner wall of the corresponding chute B37. A vortex spring B50 is nested on the rotating shaft B48; one end of the vortex spring B50 is connected to the rotating shaft B48, and the other end is connected to the ring 39 on the inner end wall of the roller A32.

[0040] The motor 26, the electric push rod 23 and the liquid pump 9 in the present invention all adopt existing technologies.

[0041] The present invention operates as follows: In the initial state, the desilting mechanism 27 is located on the platform 4 outside the liquid reservoir 2. The square columns A15 and B18 at the ends of the liquid extraction tube 10 are located within the square housing 11. The liquid trough A16 on the column A15 and the liquid trough B19 on the column B18 are aligned one-to-one, connecting the end of the liquid extraction tube 10 to the square housing 11. The cleaning fork 21 on the column B18 is located within the square housing 11. The two filter forks 12 are in a closed position due to the action of their respective vortex springs A14, which are in a compressed state. The smaller radius arc surface of the cam post 49 within the desilting mechanism 27 opposes all of the scrapers 45 without restricting their movement. The two vortex springs B50 are in a neutral position, the two springs A30 are in a stretched state, the spring B43 is in a compressed state, and the rack 53 is not engaged with the corresponding gear C51.

[0042] When the present invention is needed to treat waste liquid, waste liquid with a liquid level lower than the platform 4 is injected into the liquid storage tank 2 through the liquid adding pipe 8. The sealing curtain 54 at the lower end of the cover plate 6 has a good sealing effect because it forms a space for the cover plate 6. Therefore, the waste gas generated by the waste liquid in the liquid storage tank 2 will not or will be less likely to leak from the sealing curtain 54. Instead, it rises under the guidance of the inclined cover plate 6 and converges to the exhaust pipe 7 on the cover plate 6 for discharge, which will not cause suffocation and shock to the personnel working on the platform 4.

[0043] When the waste liquid in the liquid storage tank 2 has been processed through the corresponding process, the liquid pump 9 is started to discharge the liquid outward through the pump. The waste liquid in the liquid storage tank 2 is initially filtered when passing through the two filter forks 12 of the square sleeve 11 at the end of the liquid extraction tube 10, and is then filtered for the second time by the filter wool 20 in the liquid tank B19 when passing through the upper liquid tank B19 of the square column B18 and the upper liquid tank A16 of the square column A15 and entering the liquid extraction tube 10. The waste liquid that has been doubly filtered is discharged through the liquid extraction tube 10.

[0044] The two filter forks 12 on the square sleeve 11 at the end of the liquid extraction tube 10 should be equipped with a lot of residues for filtering the waste liquid. The filter hairs 20 in the liquid tank B19 on the square column B18 will also be equipped with a lot of residues due to filtering the waste liquid. In order to prevent the filter forks 12 and the liquid tank B19 from being blocked by the attached residues, the electric push rod 23 is started. The electric push rod 23 drives the rotating shaft A17 on the liquid extraction tube 10 to move axially through the rotating seat 22. The rotating shaft A17 drives the square column A15 and the square column B18 to move synchronously outside the square sleeve 11. The cleaning fork 21 on the square column B18 will effectively clean the residue attached to the filter forks 12 when it passes through the two filter forks 12. When the square column B18 and the square column A15 meet the two filter forks 12, as the square column A15 and the square column B18 continue to move, the two filter forks 12 will open under the push of the square column B18 and the square column A15, and the two vortex springs A14 on each filter fork 12 will be further compressed. When the filter wool 20 in the liquid tank B19 on the square column B18 is completely moved to the outside of the square sleeve 11 and the square column B18 does not interact with the two filter forks 12, the electric push rod 23 is stopped and the motor 26 is started. The motor 26 drives the square column B18 to rotate through the gear B25, the gear A24 and the rotating shaft A17. The rotation of the square column B18 causes the residue attached to the filter wool 20 in the liquid tank B19 to be washed away by the waste liquid. At the same time, the residue cleaned from the filter fork 12 on the cleaning fork 21 is also washed away by the waste liquid as the square column B18 rotates.

[0045] After the residue on the cleaning fork 21 and the filter wool 20 is rinsed clean, when the liquid tank B19 on the square column B18 is exactly opposite to the liquid tank A16 on the square column A15, the motor 26 is stopped and the electric push rod 23 is started. The electric push rod 23 drives the square columns A15 and B18 to move into the square sleeve 11 through a series of transmissions and finally resets. After the square columns A15 and B18 are completely reset in the square sleeve 11, the electric push rod 23 is stopped. In this way, the cleaning of the filter structure on the liquid extraction pipe 10 is completed, and the filter mechanism of the liquid extraction pipe 10 is prevented from being blocked.

[0046] During the resetting process of the square pillars B18 and A15, the two filter forks 12 are respectively closed against each other under the resetting action of the corresponding two vortex springs A14.

[0047] After long-term use, a large amount of sediment from waste liquid will be deposited and attached to the bottom slope 3 of the liquid storage tank 2. At this time, the silt removal mechanism 27 needs to be used to clean the slope 3.

[0048] By pulling the pull rope 28, the dredging mechanism 27 slowly moves along the slope 3 into the deep of the waste liquid under the action of its own gravity. When the dredging mechanism 27 moves downward along the slope 3, the roller A32 and the roller B33 rotate. The roller A32 drives the rotating shaft B48 to rotate synchronously through the two vortex springs B50. The rotating shaft B48 drives the gear C51 and the cam column 49 installed thereon to rotate synchronously. The cam column 49 does not restrict the radial movement of all scrapers 45 along the roller A32.

[0049] As roller A32 rotates, scrapers 45 within chutes A34 on the rim of roller A32 move freely and effectively and evenly stir the waste liquid, promoting waste liquid treatment and improving waste liquid treatment efficiency. As roller A32 rotates, the inclined surfaces 41 on the two clamping blocks A40 rotate about axis B48, facing toward clamping block B44. Therefore, the rotation of roller A32 is not restricted by the locking mechanism between clamping blocks A40 and B44. Spring B43 allows clamping block A40 to cycle past clamping block B44 and reset.

[0050] The dredging mechanism 27 stops moving when it reaches the lowest end of the slope 3, and the rollers A32 and B33 stop rotating. Then, the pull rope 28 is pulled, and the pull rope 28 drives the U-frame 29 to move relative to the two sleeves 31. The two springs A30 are further stretched, and the U-frame 29 drives the racks 53 on the two synchronization rods 52 to engage with the gear C51 at the corresponding end of the rotating shaft B48 and drive the rotating shaft B48 to rotate relative to the roller A32. The rotating shaft B48 drives the cam column 49 to rotate synchronously, and the two vortex springs B50 are further compressed to store energy. Finally, the larger radius arc surface of the cam column 49 interacts with all the scrapers 45 and drives the scrapers 45 to move radially outward along the roller A32 to the limit, so that the scrapers 45 protrude a certain length from the roller rim.

[0051] When the scraper 45 reaches its limit of movement outside of roller A32 due to the cam column 49, as the pull rope 28 continues to be pulled, the cam column 49, through the scraper 45, forms a synchronous integration with roller A32. At this point, the movement of the U-frame 29 relative to the sliding sleeve 31 reaches its limit, and the dredging mechanism 27, under the continued pull of the pull rope 28, begins to move upward along the slope 3, causing rollers A32 and B33 to rotate. As roller A32 rotates, roller A32 drives the block A40 on the ring 35 to rotate synchronously. When the block A40 meets the block B44, the block B44 blocks the movement of the block A40, causing roller A32 to stop rotating. At this point, the scraper 45, pushed out of roller A32 by the cam column 49, is located just below roller A32. As the dredging mechanism 27 continues to be pulled by the pull rope 28, it scrapes and cleans the sediment attached to the slope 3.

[0052] Once the silt removal mechanism 27 reaches platform 4, the scraper 45 on roller A32 pushes all the sediment removed from the slope 3 onto platform 4. The sediment pushed up by the scraper 45 on platform 4 can then be manually cleaned. Simultaneously, workers can perform maintenance on the silt removal mechanism 27 from platform 4. Cleaning sediment from the slope 3 at the bottom of the reservoir 2 and repairing the silt removal mechanism 27 are all performed by workers on platform 4, eliminating the risk of workers suffocating due to lack of oxygen from working at the bottom of the reservoir, which is filled with exhaust gas.

[0053] During the process of the dredging mechanism 27 entering and exiting the liquid storage tank 2 from the platform 4, due to the action of the sealing curtain 54, the exhaust gas generated in the liquid storage tank 2 will not leak from the gap between the cover plate 6 and the platform 4, thereby ensuring that the personnel working on the platform 4 will not be in danger of suffocation due to the exhaust gas.

[0054] When the dredging mechanism 27 reaches the platform 4, the tension on the pull rope 28 is removed, and the U frame 29 is reset relative to the sliding sleeve 31 under the reset action of the spring A30, and the rotating shaft B48 drives the cam column 49 to rotate and reset relative to the roller A32 under the reset action of the vortex spring B50.

[0055] To sum up, the beneficial effects of the present invention are as follows: the slope 3 at the bottom of the liquid storage tank 2 of the present invention can facilitate the dredging mechanism 27 to smoothly enter and exit the liquid storage tank 2 and facilitate the dredging mechanism 27 to clean the sediment at the bottom of the liquid storage tank 2. The dredging mechanism 27 effectively stirs the waste liquid during its movement along the slope 3 toward the liquid storage tank 2 and effectively scrapes and cleans the sediment at the bottom of the liquid storage tank 2 during its upward movement along the slope 3.

[0056] After effectively stirring the waste liquid in the liquid storage tank 2 and effectively desilting the bottom of the liquid storage tank 2, the dredging mechanism 27 moves to the platform 4 outside the liquid storage tank, so that maintenance personnel can repair and maintain the dredging mechanism 27 in an isolated state from the liquid storage tank 2. At the same time, equipment such as the liquid pump 9 and the motor 26 are located above the platform 4, thereby avoiding suffocation caused by maintenance personnel repairing equipment in a space filled with exhaust gas.

[0057] The structure at the end of the liquid extraction tube 10 in the present invention can automatically clean the residue attached to the two filter forks 12 at the end of the square sleeve 11 under the drive of the motor 26 and the electric push rod 23 after effectively filtering the waste liquid entering the liquid extraction tube 10, thereby preventing the residue in the waste liquid from clogging the liquid extraction tube 10.

Claims

1. A closed pit pool for an exhaust gas treatment system, characterized by: The invention comprises a pit pool, a liquid storage tank, a slope, a platform, a cover plate, a liquid pump, a liquid extraction pipe and a dredging mechanism, wherein the bottom of the liquid storage tank in the pit pool is a slope connected to the operating platform in the pit pool, and an inclined cover plate is provided above the liquid storage tank for sealing the liquid storage tank and facilitating the upward concentration of waste gas in the waste liquid, and a structure for discharging waste gas and injecting waste liquid into the liquid storage tank is installed at the waste gas concentration part of the cover plate; the cover plate is provided with a structure for always keeping the liquid storage tank in a sealed state during the process of the dredging mechanism for cleaning sediment at the bottom of the liquid storage tank and stirring waste liquid entering and exiting the liquid storage tank from the platform; a liquid extraction pipe is installed in the installation groove on the inner wall of the pit pool and is driven by a liquid pump on the step above the platform to extract waste liquid from the liquid storage tank; the end of the liquid extraction pipe is provided with a filtering structure for filtering the waste liquid entering therein and a cleaning structure for automatically cleaning the filtering structure; The end of the liquid extraction tube is equipped with a square sleeve connected to it, and a square column A is sliding in the square sleeve along the axis of the liquid extraction tube; a rotating shaft A is rotatably matched in the circular groove in the middle of the square column A, which moves axially under the drive of the electric push rod and rotates under the drive of the motor, and the motor and the electric push rod are both located above the platform; the end of the rotating shaft A is equipped with a square column B that slides with the inner wall of the square sleeve; the four side walls of the square column B are each provided with a liquid trough B corresponding to the liquid trough A running through both ends of the square column A, and the liquid trough B is densely covered with filter wool for secondary filtration of the waste liquid entering the liquid extraction tube through the liquid trough B and the liquid trough A; the end of the square sleeve is hinged with two filter forks for primary filtration of the waste liquid entering it through a swing shaft, and the end of the square column B is equipped with a cleaning fork that cleans the residue attached to the filter fork by cooperating with the two filter forks, and two vortex springs A are matched between the swing shaft and the square sleeve where each cleaning fork is located to reset its swing.

2. The closed pit pool of the exhaust gas treatment system according to claim 1, characterized in that: An exhaust pipe for discharging the exhaust gas and a liquid adding pipe for injecting waste liquid into the liquid storage tank are installed at the exhaust gas concentration position of the cover plate.

3. The closed pit pool of the exhaust gas treatment system according to claim 1, characterized in that: There is a gap between the lower end of the cover plate and the platform to allow the silting mechanism to enter and exit the liquid storage tank from the platform. A sealing curtain composed of hard hairs is installed at the lower end of the cover plate to seal the gap between the cover plate and the platform.

4. The closed pit pool of the exhaust gas treatment system according to claim 1, characterized in that: The rotating shaft A is sealed with a circular groove on the wall of the liquid extraction tube; the exposed part of the rotating shaft A is rotatably matched with a rotating seat that moves axially along the rotating shaft A under the drive of the electric tow rod, and a motor is installed on the rotating seat. The gear B installed on the motor output shaft is engaged with the gear A installed on the exposed end of the rotating shaft A.

5. The closed pit pool of the exhaust gas treatment system according to claim 1, characterized in that: The desilting mechanism includes a pull rope, a U frame, a spring A, a sliding sleeve, a roller A, a roller B, a ring sleeve, a scraper, a rubber strip, a rotating shaft B, a cam column, a vortex spring B, a gear C, a synchronization rod, and a rack, wherein the two branches of the U frame are respectively nested with sliding sleeves, and the sliding sleeve is installed with a spring A for sliding and resetting it on the U frame; the U frame is provided with a pull rope; a roller A and a hollow roller B parallel to the roller A are installed between the two sliding sleeves, and the ring sleeves at both ends of the roller B rotate in the circular grooves at the ends of the corresponding sliding sleeves respectively, and there is a storage device between the ring sleeve and the circular groove of the sliding sleeve. The structure does not restrict the rotation of roller A when the liquid pool slope moves downward, but restricts the rotation of roller A when roller A moves upward along the liquid pool slope; a cam column is installed in roller A through a rotating shaft B that rotates with the ring sleeve, and two vortex springs B are matched between the rotating shaft B and roller A to reset its rotation; the cam column cooperates with scrapers that slide radially along roller A in several sliding grooves A on the rim of roller A, and the width of the scraper matches the width of the slope; synchronization rods are respectively installed on the two branches of the U frame, and the rack on the synchronization rod meshes with the gear C on the corresponding end of the rotating shaft B.

6. The closed pit pool of the exhaust gas treatment system according to claim 5, characterized in that: The scraper is installed with a limit strip to prevent it from radially separating from the roller A, and the exposed end of the scraper is installed with a rubber strip to prevent it from completely entering the roller A and reduce scraper wear.

7. The closed pit pool of the exhaust gas treatment system according to claim 5, characterized in that: There is a ring groove on the outer edge of the ring sleeve, and a block A is provided in the sliding groove B on the inner wall of the ring groove to slide radially along the ring sleeve and cooperate with the block B on the inner wall of the circular groove of the corresponding sliding sleeve, and a spring B is installed to reset the block A; the block A has an inclined surface that does not restrict the rotation of the roller A when the roller A moves downward along the slope.

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