Water quality monitoring layered sampling device

Abstract

This invention discloses a water quality monitoring stratified sampling device, comprising a sampling bucket, a support rod at the top of the sampling bucket, an air rod inserted through the middle of the support rod, the air rod penetrating the sampling bucket, a piston plate at the bottom of the air rod, an exhaust channel on one side of the piston plate, and an opening and closing part within the exhaust channel; a locking rod on one side of the support rod, the outer end of the locking rod locking into a lock hole on the top side of the sampling bucket, a rope on the outer side of the locking rod, and a float at the other end of the rope; a main water inlet at the center of the bottom of the sampling bucket, with a valve on the main water inlet; several water outlets on one side of the sampling bucket, with water outlet pipes connected to the water outlets; several rotating parts inside the sampling bucket, dividing the interior of the sampling bucket into several sampling chambers, with an auxiliary drive part at one end of each rotating part, which is installed on the outer wall of the sampling bucket, to achieve independent segmentation of water samples at different depths, effectively avoiding cross-contamination between water samples and improving the accuracy of monitoring data.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, specifically to a stratified sampling device for water quality monitoring. Background Technology

[0002] Water quality monitoring is the process of monitoring and measuring the types of pollutants in water bodies, the concentrations of various pollutants, and their changing trends, and evaluating the water quality status. The monitoring scope is very broad, including routine surface and groundwater monitoring, monitoring of production and living processes, and emergency accident monitoring. Therefore, water sampling is an important part of water quality monitoring.

[0003] However, existing water quality samplers can only take samples from one depth at a time, and water samples from other depths are easily mixed in during the sampling process, affecting the accuracy of water quality monitoring results.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] To overcome the aforementioned technical problems of existing related technologies, this invention provides a water quality monitoring stratified sampling device. By accurately sampling in layers and avoiding cross-contamination of water samples, it improves the accuracy of water quality monitoring data. This provides reliable sampling data support for the operation and management of urban and rural sewage treatment facilities, the supervision of sewage outlets into rivers, the protection and restoration of watershed water ecology, and the strengthening of water ecology monitoring and evaluation. In turn, it helps to optimize and upgrade water pollution prevention and control technologies and equipment, and promotes the development of industries related to the treatment of new pollutants and ecological restoration.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows:

[0007] A water quality monitoring stratified sampling device includes a sampling bucket. A support rod is mounted on the top of the sampling bucket, and an air rod is inserted through the middle of the support rod, penetrating the sampling bucket. A piston plate is located at the bottom of the air rod, with an exhaust channel on one side of the piston plate and an opening / closing part within the exhaust channel. A locking rod is located on one side of the support rod, with its outer end locked into a lock hole on the top side of the sampling bucket. A depth sensor is fixed to the bottom outer wall of the sampling bucket, with a rope connected to one side of the depth sensor and a float passing through the locking rod at the other end. A main water inlet is located at the center of the bottom of the sampling bucket. The sampling bucket has a valve 1 at the inlet; the side wall of the sampling bucket has several layered water inlets spaced along the height direction, each layered water inlet corresponding to a sampling chamber, and each layered water inlet is equipped with a valve 3, which is electrically connected to the depth sensor; the sampling bucket has several water outlets on one side, each connected to a water outlet pipe, and each water outlet is equipped with a valve 2, which is individually controlled to open and close; the sampling bucket has several rotating parts inside, which divide the inside of the sampling bucket into several sampling chambers, and one end of the rotating part is equipped with an auxiliary drive part, which is installed on the outer wall of the sampling bucket.

[0008] The outer wall of the sampling bucket is equipped with several U-shaped brackets corresponding to the water outlet, and the water outlet pipe is clamped in the corresponding U-shaped brackets.

[0009] The water outlet corresponds one-to-one with the sampling chamber and is located at the bottom of the sampling chamber.

[0010] The opening and closing part includes a disc installed in the exhaust channel. The disc has a through hole in the middle and a hollow structure inside. One side of the disc has a side groove, and a gear is located on the outside of the side groove. A gear shaft is inserted in the middle of the gear, and a driver is connected to the output end of the gear shaft. The driver is installed inside the piston plate. The top periphery of the disc has several arc-shaped grooves, and a matching arc-shaped plate is located in the arc-shaped groove. The bottom of the arc-shaped plate is installed on the top of the rotating ring. The rotating ring is movably connected to the inner bottom wall of the disc. The inner wall of the rotating ring has inner gear teeth between two adjacent arc-shaped plates. An opening and closing plate is located inside the inner gear teeth, and an outer gear tooth that meshes with the inner gear teeth is located outside the opening and closing plate. The opening and closing plate is movably connected to the inner bottom wall of the disc through a movable shaft. An outer gear tooth that meshes with the gear is located on one side of the inner gear teeth on the outer wall of the rotating ring.

[0011] The piston plate has a rubber sealing ring at the bottom.

[0012] The rotating part includes a horizontal shaft that runs through the sampling barrel. A sealing sleeve is provided at the penetration point between the horizontal shaft and the side wall of the sampling barrel. Two bushings are fitted on the horizontal shaft, and the outer sides of the bushings are fixed to the two ends of the right plate. Three bushings are fitted on the horizontal shaft between the two bushings, and the outer sides of the bushings are fixed to the side of the left plate. One end of the horizontal shaft passes through the sampling barrel and is connected to the auxiliary drive part.

[0013] The auxiliary drive unit includes an outer frame, which is fixed to the outer wall of the sampling barrel. The inner side wall of the outer frame is provided with a sliding frame, and the inner wall of the frame is provided with a symmetrical inner plate. The inner plate is provided with a guide groove near the outlet end. The guide groove is provided with a limiting rod one and a limiting rod two. One end of the limiting rod one and the opposite end of the limiting rod two are provided with a protrusion. The sides of the two protrusions are respectively provided with a turntable one and a turntable two. The turntable one is connected to the horizontal axis one end on the side corresponding to the inner plate, and the side of the turntable two away from the limiting rod two is connected to the adjacent bushing one. The horizontal axis passes through the turntable two. A pneumatic unit is provided at the center of the inner side of the frame.

[0014] The pneumatic part includes a cylinder, which is fixed on the inner wall of the outer frame. A matching rod is provided inside the cylinder, which passes through the cylinder. A connector is inserted on the side of the rod away from the cylinder. Both ends of the connector are provided with support plates, and one side of the support plate is fixed to the side of the frame.

[0015] Both the left and right plates have rubber sealing layers on their outer walls.

[0016] Among them, the bushing 1 located at the center position has a through hole in the middle, the air rod 1 passes through the through hole and the horizontal shaft, and a sealing ring is provided at the connection between the air rod 1 and the through hole and the horizontal shaft.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. By driving the left and right plates of the rotating part to rotate synchronously through the auxiliary drive unit, the number of sampling chambers and the layer spacing can be flexibly adjusted to achieve independent separation of water samples at different depths, effectively avoid cross-contamination of water samples from different layers, and improve the accuracy of monitoring data.

[0019] 2. The opening and closing part cooperates with the piston plate, and the exhaust channel is precisely controlled by the driver. The piston plate is driven by the air rod to adjust the pressure inside the sampling bucket. The timing and flow of water sample inflow can be precisely controlled to avoid the entrainment of sediment or sampling deviation due to pressure fluctuations.

[0020] 3. The rubber sealing ring at the bottom of the piston plate, the rubber sealing layers of the left and right plates, the sealing sleeve between the horizontal axis and the sampling barrel wall, and the sealing ring at the connection between the air rod and each component form a multi-layer sealing structure, which fully covers all possible leakage points and ensures that the water sample does not leak or become contaminated during collection and export.

[0021] 4. Each outlet is equipped with an independent valve, which can directly discharge water samples of the corresponding level without disassembling the device. With the help of floats and ropes, the sampling depth can be accurately located, which significantly improves the convenience and efficiency of sampling operations.

[0022] 5. The outlet pipe is fixed by a U-shaped bracket to prevent the outlet pipe from getting tangled or damaged during the lowering and lifting of the device; at the same time, the auxiliary drive unit adopts pneumatic drive, which has a compact structure and stable driving force, and is suitable for complex water environments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an external perspective view according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the sampling bucket structure according to an embodiment of the present invention;

[0027] Figure 4This is a schematic diagram of the opening and closing part structure according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of a rotating ring structure according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the connection structure between the rotating part and the auxiliary drive part according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the left plate structure according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the right plate structure according to an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Sampling bucket; 2. Frame rod; 3. Air rod 1; 4. Piston plate; 5. Exhaust channel; 6. Opening and closing part; 7. Locking rod; 8. Rope; 9. Float; 10. Main inlet; 11. Outlet; 12. Outlet pipe; 13. Rotating part; 14. Sampling chamber; 15. Auxiliary drive part; 16. U-shaped bracket; 17. Disc; 18. Through hole; 19. Side groove; 20. Gear; 21. Arc groove; 22. Arc plate; 23. Rotating ring; 24. Inner wheel 25. Gear; 26. Opening and closing plate; 27. Outer gear tooth one; 28. Outer gear tooth two; 29. ​​Horizontal shaft; 30. Bushing two; 31. Right plate; 32. Bushing one; 33. Left plate; 34. Outer frame; 35. Frame; 36. Inner plate; 37. Guide groove; 38. Limiting rod one; 39. Protrusion; 40. Turntable one; 41. Turntable two; 42. Cylinder; 43. Air rod two; 44. Support plate; 45. Through hole; 46. Limiting rod two; 47. Layered water inlet. Detailed Implementation

[0034] 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.

[0035] According to an embodiment of the present invention, a water quality monitoring stratified sampling device is provided.

[0036] like Figure 1-8As shown, the device includes a sampling barrel 1, a support rod 2 fixedly mounted on the top of the sampling barrel 1, a lifting ring on the top of the support rod 2, an air rod 3 axially inserted in the middle of the support rod 2, the air rod 3 penetrating the top wall of the sampling barrel 1 and extending into the interior of the sampling barrel 1, a piston plate 4 coaxially fixed at the bottom of the air rod 3, the piston plate 4 slidingly sealingly engaging with the inner wall of the sampling barrel 1, a rubber sealing ring at the bottom edge of the piston plate 4, and an exhaust channel 5 penetrating vertically on one side of the piston plate 4, with an opening and closing part 6 inside the exhaust channel 5.

[0037] The sampling barrel 1 has a locking rod 7 hinged to one side of the support rod 2. The outer end of the locking rod 7 is locked into a lock hole on the top side of the sampling barrel 1. A depth sensor is fixedly installed on the bottom outer wall of the sampling barrel 1. A rope 8 is connected to one side of the depth sensor. The length of the rope 8 is adjustable and can be scaled according to different depths. A float 9 is installed at the end of the rope 8 away from the depth sensor. A main water inlet 10 is located at the center of the bottom of the sampling barrel 1. A valve is installed on the main water inlet 10. Several layered water inlets 46 are spaced apart along the height direction on the side wall of the sampling barrel 1. Each layer of water inlet 46 corresponds to a sampling chamber. Each layer of water inlet 46 is equipped with a valve three, which is electrically connected to the depth sensor. Three water outlets 11 are spaced apart along the height direction on one side of the sampling bucket 1. Each water outlet 11 corresponds to a sampling chamber. A valve two is installed on each water outlet 11. Each valve two is individually controlled to open and close. A water outlet pipe 12 is connected to the water outlet 11. Three U-shaped brackets 16 are provided on the outer wall of the sampling bucket 1 at the position of the water outlet 11. The water outlet pipe 12 is clamped in the corresponding U-shaped bracket 16.

[0038] In addition, two rotating parts 13 are provided inside the sampling barrel 1 along the height direction. The rotating parts 13 divide the interior of the sampling barrel 1 into three independent sampling chambers 14. The rotating parts 13 include a horizontal shaft 28, which runs horizontally through the sampling barrel 1. A sealing sleeve is provided at the penetration point between the horizontal shaft 28 and the side wall of the sampling barrel 1. Two bushings 29 are coaxially fitted on the horizontal shaft 28. The outer sides of the bushings 29 are fixed to the two ends of the side of the right plate 30. Three bushings 31 are coaxially fitted on the horizontal shaft 28 between the two bushings 29. The outer sides of the bushings 31 are fixed to the side of the left plate 32. The outer walls of the left plate 32 and the right plate 30 are both provided with rubber sealing layers.

[0039] One end of the horizontal axis 28 passes through the side wall of the sampling barrel 1 and is connected to an auxiliary drive unit 15. The auxiliary drive unit 15 includes an outer frame 33, which is fixed to the outer wall of the sampling barrel 1. The inner side wall of the outer frame 33 is provided with a frame 34 that slides horizontally. The inner wall of the frame 34 is provided with a symmetrical inner plate 35. The inner plate 35 is provided with an arc-shaped guide groove 36 near the outlet end. Limiting rod 1 37 and limiting rod 2 45 are respectively provided in the two guide grooves 36. Both limiting rod 1 37 and limiting rod 2 45 slide with the guide grooves 36. One end of limiting rod 1 37 and the opposite end of limiting rod 2 45 are provided with There is a protrusion 38, and two turntables 39 and 40 are respectively provided on the side of the protrusions 38. Turntable 39 is connected to the horizontal shaft 28, and turntable 40 is sleeved on the horizontal shaft 28 and connected to the adjacent bushing 31. The limiting rod 37 and the limiting rod 45 are respectively located on the inner side wall of the guide groove 36 on both sides. When the inner plate 35 slides in the outer frame 33 with the frame 34, the guide groove 36 will drive the inner limiting rod 37 and the limiting rod 45 to move towards the center or slide towards both sides at the same time. In this way, the left plate 32 and the right plate 30 will open or close at the same time.

[0040] A pneumatic unit is provided at the center of the inner side of the frame 34. The pneumatic unit includes a cylinder 41, which is fixed on the inner wall of the outer frame 33. A matching air rod 42 is provided inside the cylinder 41. The air rod 42 passes through the output end of the cylinder 41 in a horizontal direction. A connector is inserted on the side of the air rod 42 away from the cylinder 41. Support plates 43 are provided at both ends of the connector. The side of the support plate 43 away from the connector is fixed to the side of the frame 34.

[0041] The bushing 31 located at the center has an axial through hole 44 in the middle. The air rod 3 passes through the through hole 44 and the axial through hole of the horizontal shaft 28. Double sealing rings are provided at the junctions of the air rod 3 with the through hole 44 and the axial through hole of the horizontal shaft 28.

[0042] The opening and closing part 6 includes a disc 17, which is fixedly installed in the exhaust channel 5. The disc 17 has a through hole 18 that runs vertically through the middle. The disc 17 has a hollow structure inside. A side groove 19 is provided on one side of the disc 17. A gear 20 is provided on the outside of the side groove 19. A gear shaft is inserted vertically through the middle of the gear 20. The output end of the gear shaft is connected to a driver. The driver is fixedly installed on one side inside the piston plate 4. The top periphery of the disc 17 is provided with four arc-shaped grooves 21 spaced along the circumferential direction. The arc-shaped grooves 21 are provided with matching arc-shaped plates 22. The bottom of the arc-shaped plates 22 is fixedly installed on the top of the rotating ring 23. The rotating ring 23 is movably connected to the inner bottom wall of the disc 17 through bearings. The inner wall of the rotating ring 23 is provided with inner gear teeth 24 between two adjacent arc-shaped plates 22. The inner side of the inner gear teeth 24 is provided with an opening and closing plate 25. The outer side of the opening and closing plate 25 is provided with an outer gear tooth 26 that meshes with the inner gear teeth 24. The opening and closing plate 25 is movably connected to the inner bottom wall of the disc 17 through a movable shaft. The outer wall of the rotating ring 23 is provided with an outer gear tooth 27 corresponding to the position of one of the inner gear teeth 24. The outer gear tooth 27 meshes with the gear 20.

[0043] Working principle: When water quality monitoring is required, the device is lowered into the water area by connecting the lifting ring to the lifting equipment. Before being lowered into the water, valve three is opened, causing the cylinder 41 and the air rod 42 to extend and retract. The air rod 42 pushes the frame 34 to slide within the outer frame 33. When the frame 34 slides, the guide grooves 36 on the two inner plates 35 drive the limiting rods 37 and 45, which move synchronously in opposite directions. The rotation directions of turntables 39 and 40 are reversed, and the left plate 32 and right plate 30 flip and come together. At this time, the rotating parts 13 inside the sampling barrel 1 open, and the internal sampling chamber 14 is connected. Then, the air rod 31 is activated. The piston plate 4 rises uniformly upwards, expelling air from the barrel and creating negative pressure. Then, valve three is closed, and cylinder 41 is activated to reverse the drive, unfolding the left plate 32 and right plate 30. This causes a multi-layered sealed sampling chamber 14 to form inside the sampling barrel 1. The device is then placed in the water. The depth sensor detects the required depth, controlling the extension and retraction of the rope. The corresponding valve three is then opened. For example, when collecting water samples from shallower water areas, the top valve three is opened, allowing water samples at the target depth to flow into the corresponding sampling chamber 14 through the corresponding layered inlet 46. A liquid level sensor is installed inside. Once the liquid level sensor detects that the water level has reached the required volume, valve three at that location is closed. When deeper water samples are needed, different valves three are opened depending on the water depth, achieving sampling at different depths.

[0044] When sampling in deeper waters, valve one is opened, and air rod one 3 is pre-activated. Air rod one 3 compresses piston plate four downward, expelling air from the lower part of sampling bucket 1 to create negative pressure. Water sample flows into the lower sampling chamber of sampling bucket 1 through main inlet 10. As the water sample enters the lower sampling chamber, air rod one 3 drives piston plate 4 to rise uniformly upward until the water sample in the lower part of sampling bucket 1 reaches the required water level. Then, valve one is closed, and the device is lifted out of the water, thus completing the stratified sampling.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stratified sampling device for water quality monitoring, characterized in that, The sample includes a sampling bucket (1), a support rod (2) at the top of the sampling bucket (1), an air rod (3) inserted through the middle of the support rod (2), the air rod (3) passing through the sampling bucket (1), a piston plate (4) at the bottom of the air rod (3), an exhaust channel (5) on one side of the piston plate (4), and an opening and closing part (6) inside the exhaust channel (5); a locking rod (7) on one side of the support rod (2), the outer end of the locking rod (7) being locked in the lock hole on the top side of the sampling bucket (1); a depth sensor is fixedly installed on the bottom outer wall of the sampling bucket (1), a rope (8) is connected to one side of the depth sensor, and a float (9) is installed at the other end of the rope (8); a main water inlet (10) is located at the center of the bottom of the sampling bucket (1), and a valve is installed on the main water inlet (10). Door 1; The side wall of the sampling bucket (1) is provided with several layered water inlets (46) at intervals along the height direction. Each layered water inlet (46) corresponds to a sampling chamber. Each layered water inlet (46) is provided with a valve 3, which is electrically connected to the depth sensor. The sampling bucket (1) is provided with several water outlets (11) on one side. Water outlets (11) are connected to water outlet pipes (12). Each water outlet (11) is provided with a valve 2, which controls the opening and closing of each valve 2. The sampling bucket (1) is provided with several rotating parts (13). The rotating parts (13) divide the inside of the sampling bucket (1) into several sampling chambers (14). One end of the rotating parts (13) is provided with an auxiliary drive part (15), which is installed on the outer wall of the sampling bucket (1). The opening and closing part (6) includes a disc (17), which is installed in the exhaust channel (5). The disc (17) has a through hole (18) in the middle. The disc (17) has a hollow structure inside. A side groove (19) is provided on one side of the disc (17). A gear (20) is provided on the outside of the side groove (19). A gear shaft is inserted in the middle of the gear (20). The output end of the gear shaft is connected to a driver. The driver is installed on one side of the piston plate (4). Several arc-shaped grooves (21) are provided around the top of the disc (17). A matching arc-shaped plate (22) is provided in the arc-shaped groove (21). The bottom of 22) is installed on the top of the rotating ring (23). The rotating ring (23) is movably connected to the inner bottom wall of the disc (17). The inner wall of the rotating ring (23) is provided with inner gear teeth (24) between two adjacent arc plates (22). The inner side of the inner gear teeth (24) is provided with an opening and closing plate (25). The outer side of the opening and closing plate (25) is provided with an outer gear tooth (26) that meshes with the inner gear teeth (24). The opening and closing plate (25) is movably connected to the inner bottom wall of the disc (17) through a movable shaft. The outer wall of the rotating ring (23) is provided with an outer gear tooth (27) that meshes with the gear (20) on one side of the inner gear teeth (24). The rotating part (13) includes a horizontal shaft (28), which runs through the sampling barrel (1). A sealing sleeve is provided at the penetration point between the horizontal shaft (28) and the side wall of the sampling barrel (1). Two bushings (29) are fitted on the horizontal shaft (28), and the outer sides of the bushings (29) are fixed to the two ends of the side of the right plate (30). Three bushings (31) are fitted on the horizontal shaft (28) between the two bushings (29), and the outer sides of the bushings (31) are fixed to the side of the left plate (32). One end of the horizontal shaft (28) passes through the sampling barrel (1) and is connected to the auxiliary drive part (15). The auxiliary drive unit (15) includes an outer frame (33), which is fixed to the outer wall of the sampling bucket (1). The inner wall of the outer frame (33) is provided with a sliding frame (34). The inner wall of the frame (34) is provided with a symmetrical inner plate (35). The inner plate (35) is provided with a guide groove (36) near the outlet end. The guide groove (36) is provided with a limiting rod one (37) and a limiting rod two (45). One end of the limiting rod one (37) and the opposite end of the limiting rod two (45) are provided with a protrusion (38). The sides of the two protrusions (38) are respectively provided with a turntable one (39) and a turntable two (40). The turntable one (39) corresponds to the inner plate (35). One side of the turntable (40) is connected to one end of the horizontal axis (28), and the side of the turntable (40) away from the limit rod (45) is connected to the adjacent bushing (31). The horizontal axis (28) passes through the turntable (40). A pneumatic part is provided at the center of the inner side of the frame (34). The pneumatic part includes a cylinder (41), which is fixed on the inner wall of the outer frame (33). A matching air rod (42) is provided inside the cylinder (41). The air rod (42) passes through the cylinder (41). A connecting piece is inserted on the side of the air rod (42) away from the cylinder (41). Both ends of the connecting piece are provided with support plates (43). One side of the support plate (43) is fixed to the side of the frame (34).

2. The water quality monitoring stratified sampling device according to claim 1, characterized in that, The outer wall of the sampling bucket (1) is provided with several U-shaped brackets (16) corresponding to the water outlet (11), and the water outlet pipe (12) is clamped in the corresponding U-shaped brackets (16).

3. The water quality monitoring stratified sampling device according to claim 1, characterized in that, The outlet (11) corresponds one-to-one with the sampling chamber (14) and is located at the bottom of the sampling chamber (14).

4. The water quality monitoring stratified sampling device according to claim 1, characterized in that, A rubber sealing ring is provided at the bottom of the piston plate (4).

5. The water quality monitoring stratified sampling device according to claim 1, characterized in that, The outer walls of both the left plate (32) and the right plate (30) are provided with rubber sealing layers.

6. The water quality monitoring stratified sampling device according to claim 1, characterized in that, The bushing 1 (31) located at the center position has a through hole (44) in the middle, the air rod 1 (3) passes through the through hole (44) and the horizontal shaft (28), and a sealing ring is provided at the junction of the air rod 1 (3) with the through hole (44) and the horizontal shaft (28).

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