Fixed-distance water sample collection device

Abstract

The fixed-distance water sample collecting device comprises a main supporting cylinder and sampling cylinders, three vertical sampling cylinders are fixed to the circumference of the outer wall of the main supporting cylinder at equal angles, the bottom of each sampling cylinder is in sealed threaded connection with an auxiliary dome, and the upper portion of each sampling cylinder is in sealed rotating connection with a valve element; the bottom of each auxiliary dome is rotationally connected with a vertical stirring shaft in a sealed mode, an auger is coaxially fixed to the upper portion of each stirring shaft, and an auxiliary turbine is coaxially fixed to the bottom of each stirring shaft. Through pushing of water during sinking, a main turbine and an auxiliary turbine can rotate forwards, and a first rack, a second rack and a third rack can move upwards to be sequentially meshed with tooth parts of incomplete gears through forward rotation of the main turbine, so that valve elements can sequentially seal a sampling barrel at intervals; in the process, the device is in a sinking state all the time, so that fixed-distance water sample collection can be realized, and electrical elements and electric energy are not needed.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, and in particular to a fixed-distance water sample collection device. Background Technology

[0002] In water quality testing, water samples need to be collected at different depths to analyze the water quality at various depths. Existing sampling devices have multiple sampling components, enabling them to collect water samples at fixed intervals at different depths during descent. This method reduces the number of sampling attempts and yields more representative samples, leading to more accurate test results. However, these devices are often controlled by electrical components, consuming electricity and requiring higher waterproofing performance, resulting in higher manufacturing and operating costs. Furthermore, manual lifting is often necessary after sampling, requiring the use of cables, which then need to be combed and maintained afterward, making the operation complex and cumbersome, thus reducing sampling efficiency and highlighting the shortcomings of existing technology. Summary of the Invention

[0003] The purpose of this invention is to provide a fixed-distance water sample collection device to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A fixed-distance water sampling device includes a main support cylinder and sampling cylinders. Three vertical sampling cylinders are fixed at equal angles around the outer circumference of the main support cylinder. Each sampling cylinder has a sub-dome sealed and threadedly connected to its bottom, and a valve core sealed and rotatably connected to its upper part. Each sub-dome has a vertical stirring shaft sealed and rotatably connected to its bottom. Each stirring shaft has an auger coaxially fixed to its upper part and a sub-turbine turbine coaxially fixed to its bottom. Each valve core has a horizontal valve stem fixed to it, and each valve stem has an incomplete gear coaxially fixed to it. Each incomplete gear has two sub-limiting platforms fixed to it, located on both sides of the circumference of the incomplete gear's teeth. The main support cylinder has a main dome sealed and threadedly connected to its bottom, and a vertical gear reducer is installed at its bottom. The input shaft of the gear reducer is sealed and rotatably connected to the main dome, and a one-way clutch is installed at the top of its output shaft. The output shaft of the gear reducer is coaxially fixed to the driving element of the one-way clutch, and its input... A main turbine is coaxially fixed at the bottom of the shaft. The driven part of the one-way clutch is coaxially fixed to the internal threaded cylinder. A horizontal lower support plate and a guide plate are fixed to the bottom of the inner wall of the main support cylinder. A vertical internal threaded cylinder is rotatably connected to the lower support plate. A vertical external threaded cylinder is coaxially threaded to the outer wall of the internal threaded cylinder, and a handwheel is coaxially fixed to the outer wall. A vertical lower support frame is fixed to the top of the external threaded cylinder and is slidably connected to the guide plate. The lower support frame is sequentially fixed with equal angles around its circumference. The rack consists of three vertical racks: rack 1, rack 2, and rack 3, each capable of meshing with a separate incomplete gear. A first limiting platform is fixed to the bottom of rack 1, second limiting platforms are fixed to both the upper and lower parts of rack 2, and a third limiting platform is fixed to the upper part of rack 3. The bottom of the main support cylinder has a moving groove, and a sealing cylinder is coaxially and threadedly connected to it. The moving groove is interlocked with a handwheel. A floating part is installed on the upper part of the main support cylinder.

[0005] Based on the above technical solution, the floating part includes a transmission rod, a transmission cylinder, a compression spring, a lower friction disc, an upper support frame, a heat-conducting rod, a lower heat-conducting plate, an upper friction disc, an upper support plate, an upper heat-conducting plate, a storage cylinder, a screw cap, an interception net, a secondary support cylinder, an airbag, a sealing plug, cables, and wing plates. A vertical transmission rod is rotatably connected to the upper part of the lower support frame. The transmission rod is slidably connected to the output shaft of the gear reducer. A vertical transmission cylinder is slidably connected to the transmission rod, and a vertical compression spring is fixed to its top. The top of the compression spring is fixed to the bottom of the inner wall of the transmission cylinder. A horizontal lower friction disc is fixed to the upper part of the transmission cylinder. A horizontal upper support frame is fixed to the upper part of the main support cylinder. A vertical heat-conducting rod is slidably connected to the upper support frame. A horizontal lower heat-conducting plate is fixed to the top of the heat-conducting rod, and a horizontal upper friction disc is fixed to the bottom. A horizontal upper support plate is fixed to the upper part of the main support cylinder, and a horizontal upper heat-conducting plate is fixed to the middle of the upper support plate. A vertical storage cylinder is fixed to the top of the storage cylinder, which is threaded with a vertical screw cap and contains ammonium bicarbonate granules. An intercepting net is fixed to the upper part of the screw cap. A vertical secondary support cylinder is threadedly connected to the upper part of the main support cylinder. A foldable airbag is fixed to the bottom of the secondary support cylinder, and a vertical sealing plug is inserted into the upper part. The airbag is coated with a conspicuous and waterproof mark. A cable is fixed to the sealing plug, and the other end of the cable is fixed to the secondary support cylinder. Three vertical wing plates are fixed at equal angles on the circumference of the upper outer wall of the main support cylinder.

[0006] Based on the above technical solution, when the main support cylinder and the auxiliary support cylinder move downwards in the water, they can cause the main turbine and the auxiliary turbine to rotate forward. When the main support cylinder and the auxiliary support cylinder move upwards in the water, they can cause the main turbine and the auxiliary turbine to rotate in reverse. When the main turbine rotates, the output shaft of the gear reducer can rotate slowly in the same direction through the gear reducer. When the output shaft of the gear reducer rotates forward, the internal threaded cylinder can rotate simultaneously through the one-way clutch. When the output shaft of the gear reducer rotates in reverse, the internal threaded cylinder cannot rotate through the one-way clutch. The forward and reverse rotation of the output shaft of the gear reducer can drive the transmission rod to rotate simultaneously. When the internal threaded cylinder rotates forward and in reverse, the external threaded cylinder can slide up and down along the guide plate. When the lower support frame slides upwards following the external threaded cylinder, it can sequentially cause the first rack, the second rack, and the third rack to mesh with the teeth of each incomplete gear. When the lower support frame slides downwards following the external threaded cylinder, it can... This causes racks 3, 2, and 1 to mesh with the toothed portions of each incomplete gear. When rack 1 meshes with the toothed portion of one of the incomplete gears, the secondary limiting platforms of the other two incomplete gears abut against limiting platforms 2 and 3, respectively. When rack 2 meshes with the toothed portion of one of the incomplete gears, the secondary limiting platforms of the other two incomplete gears abut against limiting platforms 1 and 3, respectively. When rack 3 meshes with the toothed portion of one of the incomplete gears, the secondary limiting platforms of the other two incomplete gears abut against limiting platforms 1 and 3, respectively. When the teeth of the gears mesh, the secondary limiting platforms of the other two incomplete gears abut against the first limiting platform and the second limiting platform, respectively. When the lower support frame slides up and down with the external threaded cylinder, the meshing of the first rack, the second rack and the third rack with each incomplete gear, and the abutment of the first limiting platform, the second limiting platform and the third limiting platform with each secondary limiting platform, enable each valve stem to rotate sequentially at intervals. When the valve core rotates to a certain position with the valve stem, it can seal the sampling cylinder.

[0007] Based on the above technical solution, the upper friction disk is always in contact with the lower friction disk under the action of gravity. When the transmission rod rotates, it can make the lower friction disk rotate relative to the upper friction disk while in contact with it. When the transmission rod moves upward with the lower support frame, it can push the transmission cylinder, compression spring, lower friction disk, upper friction disk, heat-conducting rod and lower heat-conducting plate upward, and finally make the lower heat-conducting plate fit with the upper heat-conducting plate, so that the compression spring is in an elastic compression state. After being heated, the upper heat-conducting plate can heat the ammonium bicarbonate particles in the storage cylinder.

[0008] Compared with existing technologies, this invention has the following advantages: This invention utilizes the propulsion of water during submersion to enable the main turbine and auxiliary turbine to rotate forward. The forward rotation of the main turbine causes racks one, two, and three to move upward and sequentially mesh with the teeth of the incomplete gears. This allows the valve cores to seal the sampling cylinder sequentially at intervals. Throughout this process, the device remains in a submerged state, thus enabling fixed-distance water sample collection without the need for electrical components and power, reducing operating and manufacturing costs. Furthermore, as the main turbine continues to rotate... The movement allows the lower heat-conducting plate to eventually come into contact with and adhere to the upper heat-conducting plate, and the lower friction disk rotates relative to the upper friction disk. The heat generated by this friction is conducted to heat the ammonium bicarbonate particles in the storage cylinder. The heated ammonium bicarbonate particles decompose to produce carbon dioxide and ammonia, which inflates the air bladder, increasing the drainage volume and buoyancy. This allows the device to float automatically, avoiding the use of cables and the resulting reduction in sampling efficiency, thus improving sampling efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram showing the fit between the main support cylinder and the sealing cylinder of the present invention.

[0010] Figure 2 This is a schematic diagram of the cooperation between the one-way clutch and the gear reducer of the present invention.

[0011] Figure 3 This is a schematic diagram showing the connection between the transmission rod and the gear reducer of the present invention.

[0012] Figure 4 This is a partially enlarged structural diagram of point A in the present invention.

[0013] Figure 5 This is a right-side cross-sectional view of the main support cylinder and sampling cylinder of the present invention.

[0014] Figure 6 This is a right-side cross-sectional view of the main support cylinder, secondary support cylinder, and airbag of the present invention.

[0015] In the diagram: 1. Main support cylinder, 2. Sampling cylinder, 3. Secondary dome, 4. Valve core, 5. Agitator shaft, 6. Screwdriver, 7. Secondary turbine, 8. Valve stem, 9. Incomplete gear, 10. Secondary limit platform, 11. Main dome, 12. Gear reducer, 13. One-way clutch, 14. Main turbine, 15. Lower support plate, 16. Guide plate, 17. Internal threaded cylinder, 18. External threaded cylinder, 19. Handwheel, 20. Lower support frame, 21. Rack No. 1, 22. Rack No. 2, 23. Rack No. 3, 24. Limiting plate No. 1 25. Positioning platform, No. 2 limiting platform, 26. No. 3 limiting platform, 27. Actuating groove, 28. Sealing cylinder, 29. Floating part, 30. Transmission rod, 31. Transmission cylinder, 32. Compression spring, 33. Lower friction disc, 34. Upper support frame, 35. Heat-conducting rod, 36. Lower heat-conducting plate, 37. Upper friction disc, 38. Upper support plate, 39. Upper heat-conducting plate, 40. Storage cylinder, 41. Screw cap, 42. Interception net, 43. Secondary support cylinder, 44. Airbag, 45. Sealing plug, 46. Cable, 47. Wing plate. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-6As shown, a fixed-distance water sampling device includes a main support cylinder 1 and a sampling cylinder 2. Three vertical sampling cylinders 2 are fixed at equal angles around the outer circumference of the main support cylinder 1. Each sampling cylinder 2 has a sub-dome 3 sealed and threadedly connected to its bottom. The detachable sub-dome 3 allows for easy cleaning of the inner wall of the sampling cylinder 2 and the auger 6, and also allows for the removal of water samples from the sampling cylinder 2. A valve core 4 is rotatably and sealed to the upper part of each sampling cylinder 2. A vertical stirring shaft 5 is rotatably and sealed to the bottom of each sub-dome 3. An auger 6 is coaxially fixed to the upper part of each stirring shaft 5, and a secondary turbine 7 is coaxially fixed to the bottom of each. The secondary turbine 7 drives the auger 6 to rotate, enabling the rotating auger 6 to clean the sampling cylinder. The water inside the sampling cylinder 2 is stirred and agitated, allowing the sampling cylinder 2 to mix with the water in the body in real time when it is not sealed. This makes the water samples collected by the sampling cylinder 2 at the corresponding depth more accurate. Each valve core 4 is fixed with a horizontal valve stem 8, and each valve stem 8 is coaxially fixed with an incomplete gear 9. Each incomplete gear 9 is fixed with two auxiliary limiting platforms 10, which are located on both sides of the circumference of the tooth portion of the incomplete gear 9. The bottom of the main support cylinder 1 is sealed with a main dome 11. The main dome 11 and the auxiliary dome 3 can reduce the resistance of the device descending in the water. A vertical gear reducer 12 is installed at the bottom of the main support cylinder 1. The input shaft of the reducer 12 is rotatably connected to the main dome 11 with a seal, and a one-way clutch 13 is installed on the top of its output shaft. The output shaft of the gear reducer 12 is coaxially fixed to the driving element of the one-way clutch 13, and a main turbine 14 is coaxially fixed to the bottom of its input shaft. The driven element of the one-way clutch 13 is coaxially fixed to the internal threaded cylinder 17. A horizontal lower support plate 15 and a guide plate 16 are fixed to the bottom of the inner wall of the main support cylinder 1. The lower support plate 15 is rotatably connected to the vertical internal threaded cylinder 17. A vertical external threaded cylinder 18 is coaxially threaded to the outer wall of the internal threaded cylinder 17, and a handwheel 19 is coaxially fixed to the outer wall. A vertical lower support frame 20 is fixed to the top of the external threaded cylinder 18. The lower support frame 20 is slidably connected to the guide plate 16. Vertical racks 21, 22, and 3 are fixed at equal angles around its circumference. The racks 21, 22, and 3 can mesh with the incomplete gears 9 respectively. A limiting platform 24 is fixed at the bottom of the rack 21. A limiting platform 25 is fixed at both the top and bottom of the rack 22. A limiting platform 26 is fixed at the top of the rack 23. The bottom of the main support cylinder 1 is provided with a moving groove 27 and a sealing cylinder 28 is coaxially and threadedly connected to it. The moving groove 27 is interlocked with the handwheel 19. A floating part 29 is installed on the upper part of the main support cylinder 1.

[0018] The floating portion 29 includes a transmission rod 30, a transmission cylinder 31, a compression spring 32, a lower friction disc 33, an upper support frame 34, a heat-conducting rod 35, a lower heat-conducting plate 36, an upper friction disc 37, an upper support plate 38, an upper heat-conducting plate 39, a storage cylinder 40, a screw cap 41, an interception net 42, a secondary support cylinder 43, an airbag 44, a sealing plug 45, a cable 46, and a wing plate 47. A vertical transmission rod 30 is rotatably connected to the upper part of the lower support frame 20. The transmission rod 30 is slidably connected to the output shaft of the gear reducer 12. A vertical transmission cylinder 31 is slidably connected to the main support cylinder 1, and a vertical compression spring 32 is fixed at its top. The top of the compression spring 32 is fixed to the bottom of the inner wall of the transmission cylinder 31. A horizontal lower friction disc 33 is fixed to the upper part of the transmission cylinder 31. A horizontal upper support frame 34 is fixed to the upper part of the main support cylinder 1. A vertical heat-conducting rod 35 is slidably connected to the upper support frame 34. A horizontal lower heat-conducting plate 36 is fixed to the top of the heat-conducting rod 35, and a horizontal upper friction disc 37 is fixed to its bottom. A horizontal upper friction disc 37 is fixed to the top of the main support cylinder 1. An upper support plate 38 has a horizontal upper heat-conducting plate 39 fixed in the middle and a vertical storage cylinder 40 fixed at the top. The storage cylinder 40 is threadedly connected to a vertical screw cap 41 and contains ammonium bicarbonate granules. An intercepting net 42 is fixed to the upper part of the screw cap 41 to prevent the ammonium bicarbonate granules from leaking out of the storage cylinder 40. A vertical secondary support cylinder 43 is threadedly connected to the upper part of the main support cylinder 1. A foldable airbag 44 is fixed to the bottom of the secondary support cylinder 43 and is sealed with an insert at the top. A vertical sealing plug 45 is provided. The airbag 44 has a conspicuous and waterproof marking on its surface. A cable 46 is fixed to the sealing plug 45. The other end of the cable 46 is fixed to the auxiliary support cylinder 43. By setting the cable 46, the sealing plug 45 can be prevented from completely losing its binding after it is separated from the auxiliary support cylinder 43, so that the sealing plug 45 can be easily re-sealed and inserted into the auxiliary support cylinder 43. Three vertical wing plates 47 are fixed at equal angles on the upper outer wall of the main support cylinder 1. The wing plates 47 make the device more stable when it descends.

[0019] When the main support cylinder 1 and the auxiliary support cylinder 43 move downwards in the water, they enable the main turbine 14 and the auxiliary turbine 7 to rotate forward. When the main support cylinder 1 and the auxiliary support cylinder 43 move upwards in the water, they enable the main turbine 14 and the auxiliary turbine 7 to rotate in reverse. When the main turbine 14 rotates, the output shaft of the gear reducer 12 rotates slowly in the same direction through the gear reducer 12, thereby avoiding the internal thread cylinder 17 from rotating too fast due to the output shaft of the gear reducer 12 rotating too fast. This, in turn, prevents the first rack 21, the second rack 22, and the third rack 23 from moving upwards too fast, which would cause the valve core 4 to seal the sampling cylinder 2 too quickly. When the output shaft of the gear reducer 12 rotates forward, it is connected to the one-way clutch 13. The internal threaded cylinder 17 can rotate simultaneously. When the output shaft of the gear reducer 12 reverses, the internal threaded cylinder 17 cannot rotate through the one-way clutch 13. That is, when the device floats, the main turbine 14 reverses, driving the transmission rod 30, transmission cylinder 31, and lower friction disc 33 to reverse, while maintaining the contact and fit between the lower friction disc 33 and the upper friction disc 37. This allows the device to generate heat through friction between the lower friction disc 33 and the upper friction disc 37 during floating, which in turn allows for more complete and rapid decomposition of ammonium bicarbonate. This results in a faster inflation rate of the airbag 44, leading to a faster increase in buoyancy and a faster floating speed, thereby improving the efficiency of water sample collection. When the output shaft of the gear reducer 12 rotates in both directions, it can drive the transmission rod 30 to rotate simultaneously. When the internal threaded cylinder 17 rotates in both directions, it can cause the external threaded cylinder 18 to slide up and down along the guide plate 16. When the lower support frame 20 slides upward with the external threaded cylinder 18, it can sequentially cause the first rack 21, the second rack 22, and the third rack 23 to mesh with the tooth portions of each incomplete gear 9. When the lower support frame 20 slides downward with the external threaded cylinder 18, it can sequentially cause the third rack 23, the second rack 22, and the first rack 21 to mesh with the tooth portions of each incomplete gear 9. The first rack 21 meshes with the tooth portion of one of its incomplete gears 9. When the second rack 22 meshes with the tooth portion of one of the incomplete gears 9, the secondary limiting platforms 10 of the other two incomplete gears 9 abut against the second limiting platform 25 and the third limiting platform 26, respectively. When the third rack 23 meshes with the tooth portion of one of the incomplete gears 9, the secondary limiting platforms 10 of the other two incomplete gears 9 abut against the first limiting platform 24 and the third limiting platform 26, respectively. When the third rack 23 meshes with the tooth portion of one of the incomplete gears 9, the secondary limiting platforms 10 of the other two incomplete gears 9 abut against the first limiting platform 24 and the second limiting platform 25, respectively. By making the secondary limiting platforms 10 abut against the first limiting platform 24, the second limiting platform 25, and the third limiting platform 26, the incomplete gear 9 can stop rotating when abutting.As the lower support frame 20 slides up and down following the external threaded cylinder 18, the meshing of racks 21, 22, and 3 with the incomplete gears 9, and the contact between the limiting platforms 24, 25, and 3 and the auxiliary limiting platforms 10, allow the valve stems 8 to rotate sequentially at intervals. When the valve core 4 rotates to a certain position following the valve stems 8, it can seal the sampling cylinder 2.

[0020] Under the influence of gravity, the upper friction disk 37 is always in contact with the lower friction disk 33. When the transmission rod 30 rotates, the transmission cylinder 31 enables the lower friction disk 33 to rotate while in contact with the upper friction disk 37. When the transmission rod 30 moves upward with the lower support frame 20, it can push the transmission cylinder 31, compression spring 32, lower friction disk 33, upper friction disk 37, heat-conducting rod 35, and lower heat-conducting plate 36 upward, eventually causing the lower heat-conducting plate 36 to come into contact with the upper heat-conducting plate 39, so that the compression spring 32 is in an elastic compression state. The elastic repulsive force of the compression spring 32 can increase the pressure between the upper friction disk 37 and the lower friction disk 33, thereby increasing the friction force and generating more heat. After being heated, the upper heat-conducting plate 39 can heat the ammonium bicarbonate particles in the storage cylinder 40.

[0021] The working principle of this invention: Initially, all valve cores 4 and sampling cylinders 2 are in a conductive state, and the sealing cylinder 28 seals the actuating groove 27. When the device is placed into the water body to be sampled, it begins to slowly sink under its own gravity. During the sinking process, the water body will push the auxiliary turbine 7 and the main turbine 14 to rotate forward. As the main turbine 14 rotates forward, the output shaft of the gear reducer 12 will slowly rotate forward, thereby driving the inner threaded cylinder 17 to rotate forward through the one-way clutch 13. Subsequently, the outer threaded cylinder 18 can slide upward along the guide plate 16. When the lower support frame 20 moves upward with the outer threaded cylinder 18, it enables the first rack 21, the second rack 22, and the third rack 23 to interact with each other. The gears 9 engage sequentially with the teeth of each incomplete gear 9 at intervals, causing the first limiting platform 24, the second limiting platform 25, and the third limiting platform 26 to abut against the secondary limiting platform 10. This allows each incomplete gear 9 to rotate sequentially at intervals and stop after rotation. Consequently, each valve core 4 rotates sequentially within the sampling cylinder 2 at intervals and then stops, ultimately sealing the sampling cylinder 2. Because the valve cores 4 rotate sequentially at intervals, and the entire device continuously descends in the water, it is possible to achieve fixed-distance sampling (by setting the engagement timing of the first rack 21, the second rack 22, and the third rack 23 with the teeth of the incomplete gear 9, so that the interval time is...). Even if the device falls for a fixed time during this process, thus achieving a fixed distance, as the lower support frame 20 continues to move upward, it can move upward through the compression spring 32, transmission cylinder 31, lower friction disk 33, upper friction disk 37, heat-conducting rod 35, and lower heat-conducting plate 36, eventually bringing the upper heat-conducting plate 39 into contact with the lower heat-conducting plate 36. During this process, the main turbine 14 continues to rotate, thereby driving the lower friction disk 33 to rotate relative to the upper friction disk 37 through the transmission rod 30 and transmission cylinder 31. This causes the upper friction disk 37 and lower friction disk 33 to generate heat through friction, and the heat is transferred to the upper heat-conducting plate 39 through the heat-conducting rod 35 and lower heat-conducting plate 36, thereby causing the ammonium bicarbonate particles in the storage cylinder 40 to decompose due to heat. Carbon dioxide and ammonia are generated, causing the airbag 44 to gradually inflate and expand. This allows the sealing plug 45 to be discharged from the secondary support cylinder 43, bringing the airbag 44 into contact with the water. The increased volume of the airbag 44 increases the drainage volume, thus increasing the overall buoyancy of the device. This causes the entire device to begin to float until it finally reaches the surface. Because the airbag 44 is clearly marked, it is easily visible to sampling personnel, facilitating easy retrieval. After retrieval, the surface of the device can be wiped clean with a dry cloth. Then, rotating the sealing cylinder 28 exposes the actuating groove 27, and manually turning the handwheel 19 in the reverse direction reverses the internal thread cylinder 17.By reasoning through the above process, it can be deduced that the external threaded cylinder 18 and the lower support frame 20 will gradually move downwards. This allows the valve cores 4 to sequentially connect with the sampling cylinder 2 in reverse order using the engagement of racks 21, 22, 23, and the incomplete gear 9, as well as the engagement of limiting platforms 24, 25, 26, and the secondary limiting platform 10. This enables the water samples from the sampling cylinder 2 to be poured out sequentially for water quality testing. Then, the sealing cylinder 28 is rotated to re-close the actuating groove 27. The secondary support cylinder 43 is then rotated to remove it, allowing the gas in the airbag 44 to escape. The airbag 44 is then folded back and the sealing plug 45 is resealed and inserted into the secondary support cylinder 43. Finally, the screw cap 41 is rotated to remove it, the storage cylinder 40 is cleaned, and ammonium bicarbonate granules are filled. The screw cap 41 and secondary support cylinder 43 are then reinstalled, restoring the device to its initial state, ready for another periodic water sample collection operation.

[0022] The above description represents a preferred embodiment of the present invention. For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. A fixed-distance water sampling device, comprising a main support cylinder (1) and sampling cylinders (2), wherein three vertical sampling cylinders (2) are fixed at equal angles on the outer circumference of the main support cylinder (1), characterized in that: Each sampling cylinder (2) has a sealed threaded connection to a secondary dome (3) at its bottom, and a valve core (4) is sealed and rotatably connected to its upper part. Each secondary dome (3) has a sealed and rotatably connected to a vertical stirring shaft (5) at its bottom. Each stirring shaft (5) has an auger (6) coaxially fixed to its upper part, and a secondary turbine (7) coaxially fixed to its bottom. Each valve core (4) has a horizontal valve stem (8) fixed to it. Each valve stem (8) has an incomplete gear (9) coaxially fixed to it. Each incomplete gear (9) has two secondary limiting platforms (10) fixed to it. The secondary limiting platforms (10) are located in the incomplete On both sides of the tooth portion of the gear (9) in the circumferential direction, the bottom of the main support cylinder (1) is connected to a main dome (11) with a sealing thread, and a vertical gear reducer (12) is installed at the bottom. The input shaft of the gear reducer (12) is sealed and rotatably connected to the main dome (11), and a one-way clutch (13) is installed at the top of its output shaft. The output shaft of the gear reducer (12) is coaxially fixed with the driving part of the one-way clutch (13), and a main turbine (14) is coaxially fixed at the bottom of its input shaft. The driven part of the one-way clutch (13) is coaxially fixed with the internal thread cylinder (17). The main support cylinder (1) is connected to the main dome (11) with a sealing thread (11) (21), and a vertical gear reducer (12) is installed at the bottom of its input shaft (12). A horizontal lower support plate (15) and a guide plate (16) are fixed to the bottom of the inner wall of the cylinder (1). The lower support plate (15) is rotatably connected to a vertical internal threaded cylinder (17). The outer wall of the internal threaded cylinder (17) is coaxially threaded to a vertical external threaded cylinder (18), and a handwheel (19) is coaxially fixed to the outer wall. The top of the external threaded cylinder (18) is fixed to a vertical lower support frame (20), which is slidably connected to the guide plate (16). The lower support frame (20) is circumferentially fixed with vertical racks No. 1 (21), No. 2 (22), and No. 3 (23) at equal angles. The rack No. 1... The first rack (21), the second rack (22) and the third rack (23) can mesh with each incomplete gear (9) respectively. The first rack (21) has a first limiting platform (24) fixed at the bottom. The second rack (22) has a second limiting platform (25) fixed at both the top and bottom. The third rack (23) has a third limiting platform (26) fixed at the top. The bottom of the main support cylinder (1) is provided with a moving groove (27) and a sealing cylinder (28) is coaxially sealed and threaded. The moving groove (27) is interlocked with the handwheel (19). The upper part of the main support cylinder (1) is equipped with a floating part (29).

2. The fixed-distance water sampling device according to claim 1, characterized in that: The floating part (29) includes a transmission rod (30), a transmission cylinder (31), a compression spring (32), a lower friction disc (33), an upper support frame (34), a heat-conducting rod (35), a lower heat-conducting plate (36), an upper friction disc (37), an upper support plate (38), an upper heat-conducting plate (39), a storage cylinder (40), a screw cap (41), an interception net (42), a secondary support cylinder (43), an airbag (44), a sealing plug (45), a cable (46), and a wing plate (47). The upper part of the lower support frame (20) is rotatably connected to a vertical... The transmission rod (30) is slidably connected to the output shaft of the gear reducer (12). The transmission rod (30) is slidably connected to a vertical transmission cylinder (31), and a vertical compression spring (32) is fixed at its top. The top of the compression spring (32) is fixed to the bottom of the inner wall of the transmission cylinder (31). A horizontal lower friction disc (33) is fixed on the upper part of the transmission cylinder (31). A horizontal upper support frame (34) is fixed on the upper part of the main support cylinder (1). The upper support frame (34) slides up and down. A vertical heat-conducting rod (35) is connected to the main support cylinder (1). A horizontal lower heat-conducting plate (36) is fixed at the top of the heat-conducting rod (35), and a horizontal upper friction plate (37) is fixed at the bottom. A horizontal upper support plate (38) is fixed at the top of the main support cylinder (1). A horizontal upper heat-conducting plate (39) is fixed at the middle of the upper support plate (38), and a vertical storage cylinder (40) is fixed at the top. A vertical screw cap (41) is threaded onto the storage cylinder (40), and ammonium bicarbonate granules are stored inside. An interceptor is fixed at the top of the screw cap (41). The main support cylinder (1) is connected to a vertical secondary support cylinder (43) with a sealing thread at the top. The secondary support cylinder (43) has a foldable airbag (44) fixed at the bottom and a vertical sealing plug (45) inserted at the top. The airbag (44) has a conspicuous and waterproof marking painted on its surface. The sealing plug (45) has a cable (46) fixed to it. The other end of the cable (46) is fixed to the secondary support cylinder (43). The main support cylinder (1) has three vertical wing plates (47) fixed at equal angles on the upper outer wall circumference.

3. The fixed-distance water sampling device according to claim 2, characterized in that: When the main support cylinder (1) and the auxiliary support cylinder (43) move downwards in the water, they enable the main turbine (14) and the auxiliary turbine (7) to rotate forward. When the main support cylinder (1) and the auxiliary support cylinder (43) move upwards in the water, they enable the main turbine (14) and the auxiliary turbine (7) to rotate in reverse. When the main turbine (14) rotates, the output shaft of the gear reducer (12) rotates slowly in the same direction through the gear reducer (12). When the output shaft of the gear reducer (12) rotates forward, the internal thread cylinder (17) rotates simultaneously through the one-way clutch (13). When the output shaft of the gear reducer (12) rotates in reverse, the internal thread cylinder (17) rotates simultaneously through the one-way clutch (13). 3) The internal threaded cylinder (17) cannot be rotated. When the output shaft of the gear reducer (12) rotates in both directions, it can drive the transmission rod (30) to rotate simultaneously. When the internal threaded cylinder (17) rotates in both directions, it can make the external threaded cylinder (18) slide up and down along the guide plate (16). When the lower support frame (20) slides upward with the external threaded cylinder (18), it can make the first rack (21), the second rack (22), and the third rack (23) mesh with the teeth of each incomplete gear (9) in sequence. When the lower support frame (20) slides downward with the external threaded cylinder (18), it can make the third rack (23), the second rack (24), and the third rack (25) mesh with the teeth of each incomplete gear (9) in sequence. Rack (22) and rack 1 (21) mesh with the tooth portions of each incomplete gear (9). When rack 1 (21) meshes with the tooth portion of one of the incomplete gears (9), the secondary limiting platforms (10) of the other two incomplete gears (9) abut against the second limiting platform (25) and the third limiting platform (26) respectively. When rack 2 (22) meshes with the tooth portion of one of the incomplete gears (9), the secondary limiting platforms (10) of the other two incomplete gears (9) abut against the first limiting platform (24) and the third limiting platform (26) respectively. Rack 3 (23) meshes with the tooth portion of one of the incomplete gears (9). When meshing, the secondary limiting platforms (10) of the other two incomplete gears (9) abut against the first limiting platform (24) and the second limiting platform (25) respectively. When the lower support frame (20) slides up and down with the external threaded cylinder (18), the meshing of the first rack (21), the second rack (22) and the third rack (23) with each incomplete gear (9) and the abutment of the first limiting platform (24), the second limiting platform (25) and the third limiting platform (26) with each secondary limiting platform (10) can make each valve stem (8) rotate sequentially at intervals. When the valve core (4) rotates to a certain position with the valve stem (8), it can seal the sampling cylinder (2).

4. The fixed-distance water sampling device according to claim 3, characterized in that: Under the action of gravity, the upper friction disk (37) is always in contact with the lower friction disk (33). When the transmission rod (30) rotates, the transmission cylinder (31) enables the lower friction disk (33) to rotate while in contact with the upper friction disk (37). When the transmission rod (30) moves upward with the lower support frame (20), it can push the transmission cylinder (31), compression spring (32), lower friction disk (33), upper friction disk (37), heat-conducting rod (35) and lower heat-conducting plate (36) to move upward and finally make the lower heat-conducting plate (36) fit with the upper heat-conducting plate (39), so that the compression spring (32) is in an elastic compression state. After the upper heat-conducting plate (39) is heated, it can heat the ammonium bicarbonate particles in the storage cylinder (40).

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