Negative pressure sampling device of water quality ammonia nitrogen online analyzer

Abstract

The invention relates to the technical field of water quality detection and sampling, in particular to a negative pressure sampling device of a water quality ammonia nitrogen online analyzer. The device comprises a ship body, a rectangular mounting hole is formed in the center of the ship body, a lifting plate is mounted at the bottom of the mounting hole in a lifting manner, a sampling barrel for sampling is slidably mounted above the lifting plate, and a filter screen for preventing aquatic plants is arranged on the outer side of the sampling barrel. According to the device, through the arrangement of the lifting plate, weeds at the water bottom can be effectively shielded, and the situation that impurities such as the underwater weeds or green algae enter the sampling barrel, so that the impurities are mixed into water in the sampling barrel, and the effective detection and analysis of the ammonia nitrogen content in water are affected is avoided. Through the arrangement of the filter screen, impurities located on the side edge of the sampling barrel in water can be effectively shielded, and weeds and green algae located on the side edge of the sampling barrel can be prevented from entering the sampling barrel in the sampling process of the sampling barrel.

Description

Technical Field

[0001] The invention relates to the field of water quality detection sampling, and in particular to a negative pressure sampling device of an online water quality ammonia nitrogen analyzer. Background Art

[0002] Analysis of ammonia nitrogen content in water is an important means to assess the degree of water pollution and water quality. Ammonia nitrogen refers to the total concentration of dissolved ammonia and free ammonia ions in water, which usually comes from sources such as agriculture, industry and urban wastewater. By measuring the ammonia nitrogen content in water, water quality safety can be ensured and water pollution can be prevented.

[0003] The patent with publication number CN216955990U discloses an unmanned patrol boat for water quality detection and sampling, which includes an unmanned boat body and a control device arranged on the unmanned boat body, as well as an airbag, a propeller, a detection component and a sampler. The airbag is arranged at the bottom of the unmanned boat body.

[0004] However, the above device still has certain defects when used. In the prior art, since there are often impurities such as weeds and green algae on the bottom of the water, if weeds and green plants are sampled together during the sampling process, on the one hand, it will cause errors in the measurement value during the water quality detection process, and on the other hand, there is also a risk of clogging the sampling equipment. Secondly, after sampling, the weight of the hull will increase due to the water sample. Since the buoyancy of the unmanned boat is limited, there is a certain risk of the unmanned boat sinking when the hull increases in weight. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a negative pressure sampling device for an online water quality ammonia nitrogen analyzer.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: a negative pressure sampling device for an online analyzer of ammonia nitrogen in water quality, comprising a hull, a rectangular mounting hole is opened at the center of the hull, a lifting plate is installed at the bottom of the mounting hole, a sampling bucket for sampling is slidably installed above the lifting plate, a filter screen for preventing aquatic plants is arranged on the outside of the sampling barrel, a plurality of scrapers for cleaning the filter screen are abutted on the outside of the filter screen, the scrapers are fixedly connected to the lifting plate, floating air bags are arranged on both sides of the hull, and an air pump is also arranged on the hull, the air pump is used for sampling the sampling barrel, and the output end of the air pump is connected to the floating air bag.

[0007] Preferably, an inverted U-shaped gantry is fixedly connected to the top of the hull, and both ends of the gantry are respectively fixedly connected to the two side wall panels of the mounting hole, a second winding disk is rotatably installed on the top of the gantry, a winding rope is fixedly connected to the second winding disk, and the end of the winding rope away from the second winding disk is connected to the sampling barrel, a first motor is fixedly connected to one side of the top of the gantry, and the output shaft of the first motor is fixedly connected to one side wall panel of the second winding disk, and a circular hole is opened at the center of the gantry, and the winding rope passes through the circular hole.

[0008] Preferably, the sampling barrel is slidably connected to a piston plate inside, the top of the piston plate is fixedly connected to a first column, the bottom of the piston plate is fixedly connected to a second column, an end of the first column away from the piston plate passes through the top wall of the sampling barrel, and an end of the first column away from the piston plate is fixedly connected to an end of the winding rope away from the second winding disk, an end of the second column away from the piston plate passes through the bottom wall of the sampling barrel, and an end of the second column away from the piston plate is fixedly connected to the top center of the lifting plate.

[0009] Preferably, a rotating groove is provided on the lifting plate, and a rotating ring with an inverted "T"-shaped cross-section is rotatably sleeved in the rotating groove, the filter is fixedly connected to the top of the rotating ring, and the filter is located on the outside of the sampling barrel, and a water inlet for sampling is provided at the bottom of the sampling barrel, and a solenoid valve is provided in the water inlet, and a plurality of scrapers are fixedly connected to the top wall panel of the lifting plate, and the scrapers are located on the outside of the rotating groove.

[0010] Preferably, a hollow mounting column is fixedly connected to the bottom wall panel of the lifting plate, a rectangular sliding column is slidably connected inside the mounting column, a return spring is fixedly connected to the bottom of the rectangular sliding column, one end of the return spring away from the rectangular sliding column is fixedly connected to the inner bottom wall panel of the mounting column, a rack is fixedly connected to the top of the rectangular sliding column, the top wall panel of the rack is movably abutted against the bottom wall panel of the sampling barrel, the rack is meshingly connected to a driving gear, the driving gear is fixedly connected to a transmission shaft, the transmission shaft is rotatably sleeved in the bracket, the bracket is fixedly connected to the top wall panel of the lifting plate, the end of the transmission shaft away from the driving gear is fixedly connected to a bevel gear, the bevel gear is meshingly connected to a bevel gear ring, and the bevel gear ring is fixedly connected to the inner wall of the filter.

[0011] Preferably, the top of the sampling barrel is connected to an exhaust pipe, which is wound around a first winding disk, and a hollow rotating column is provided on the first winding disk. The end of the exhaust pipe away from the sampling barrel is connected to the hollow layer of the rotating column, and a U-shaped frame is fixedly connected to one side of the gantry. The first winding disk is rotatably connected in the U-shaped frame, and the first winding disk is transmission-connected to a second motor, which rotates synchronously with the first motor, and the second motor is fixedly connected to the outer wall of the U-shaped frame. The hollow layer of the rotating column is also connected to a connecting air pipe, which is rotatably sleeved in the hollow layer of the rotating column, and an end of the connecting air pipe away from the hollow layer of the rotating column is connected to an air pump.

[0012] Preferably, the input end of the air pump is connected to an electromagnetic three-way valve, which is a two-input and one-output three-way valve, and its output end is connected to the input end of the air pump. One of its two input ends is connected to a connecting air pipe, and the other input end is connected to an external air pipe. The end of the external air pipe away from the electromagnetic three-way valve is connected to the outside atmosphere, and the connecting air pipe is connected to the air pump through the electromagnetic three-way valve.

[0013] Preferably, the tops of the two floating airbags are connected by a U-shaped tube, a connector is provided on the U-shaped tube, the output end of the air pump is connected to an air outlet pipe, the end of the air outlet pipe away from the air pump is connected to the connector, a rectangular annular groove is provided at the bottom of the mounting hole, a sealing airbag is provided in the rectangular annular groove, the sealing airbag is movably abutted against the lifting plate, both sides of the sealing airbag are connected with a first built-in tube, the ends of the two first built-in tubes away from the sealing airbags are respectively connected to the two floating airbags, a one-way air inlet valve is provided at the connection between the first built-in tube and the floating airbag, two second built-in tubes are also connected to the two sides of the sealing airbag, the two second built-in tubes are also respectively connected to the two floating airbags, and a one-way pressure valve is provided at the connection between the sealing airbag and the second built-in tube.

[0014] Preferably, a turbofan for driving the hull forward is disposed at one end of the bottom of the hull, and a steering plate for controlling the steering of the hull is disposed at one end of the bottom of the hull away from the turbofan.

[0015] Preferably, both sides of the end of the bottom of the hull away from the turbofan are fixedly connected with "L"-shaped power air pipes, the two power air pipes are respectively connected to the two floating air bags, and the ends of the two power air pipes away from the two floating air bags are facing the direction of the turbofan, and an air pressure valve is arranged inside the power air pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can effectively block the weeds on the bottom of the water by setting the lifting plate, which is helpful to prevent underwater weeds or green algae and other debris from entering the sampling barrel, thereby causing the water in the sampling barrel to be mixed with impurities, thereby affecting the effective detection and analysis of the ammonia nitrogen content in the water quality. And by setting the filter, the impurities on the side of the sampling barrel in the water can also be effectively blocked, which is helpful to prevent the weeds and green algae on the side of the sampling barrel from entering the sampling barrel during the sampling process of the sampling barrel, which is helpful to further ensure the cleanliness of the sampled water quality, so that the water taken from the sampling barrel will not be mixed with impurities such as waterweed and green algae, and at the same time, it also avoids the situation where the water inlet is blocked by impurities such as waterweed and green algae.

[0017] 2. The present invention provides an air pump, so that the air in the sampling barrel will enter the air outlet pipe after being pumped out by the air pump, then enter the U-shaped tube through the air outlet pipe, and finally enter the floating air bag through the U-shaped tube. On the one hand, the gas in the sampling barrel can be discharged smoothly, and on the other hand, the floating air bag can be expanded to increase the displacement of the hull, thereby increasing the buoyancy that the hull can provide, which is conducive to avoiding the sinking of the hull.

[0018] 3. The present invention controls the electromagnetic three-way valve to connect the external air pipe with the input end of the air pump, and then controls the air pump to continuously output air to the floating airbag, so that the floating airbag is in a maximum expansion state, and the buoyancy of the hull in the water surface is also in a maximum state, which is beneficial to avoid the sinking of the hull under the state of weight gain. When the air pressure in the floating airbag reaches the preset air pressure value of the air pressure valve, the air pressure valve opens, and the pressurized gas in the floating airbag is discharged through the power air pipe. After being discharged, the gas will impact in the water, thereby providing power for the movement of the hull, assisting the turbofan to drive the hull to move effectively, accelerating the hull to return to the shore, and shortening the sampling return time of the hull. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 An enlarged schematic diagram of the structure of section A is shown; Figure 3 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 4 It is a schematic cross-sectional view of the structure of the sampling barrel of the present invention; Figure 5 It is a schematic cross-sectional view of the structure of the floating airbag of the present invention; Figure 6 This is a schematic diagram of the installation structure of the sampling barrel of the present invention; Figure 7 It is a schematic cross-sectional view of the structure of the rack of the present invention; Figure 8 It is a schematic cross-sectional view of the structure of the power air pipe of the present invention.

[0020] In the figure: 1, hull; 2, floating airbag; 3, first motor; 4, second motor; 5, filter; 6, power air pipe; 7, connector; 8, U-shaped pipe; 9, outlet pipe; 10, lifting plate; 11, turbofan; 12, steering plate; 13, gantry; 14, sealing airbag; 15, first built-in pipe; 16, sampling barrel; 17, winding rope; 18, first column; 19, piston plate; 20, second column; 21, exhaust pipe; 22, scraper; 23, bevel gear; 24, rack; 25, driving gear; 26, rectangular sliding column; 27, mounting column; 28, reset spring; 29, conical gear ring; 30, air pump; 31, electromagnetic three-way valve; 32, external air pipe; 33, first winding disk; 34, second winding disk; 35, second built-in pipe; 36, connecting air pipe. DETAILED DESCRIPTION

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0022] like Figures 1 to 8 A negative pressure sampling device for an online analyzer of ammonia nitrogen in water quality is shown, comprising a hull 1, a rectangular mounting hole is opened at the center of the hull 1, a lifting plate 10 is installed at the bottom of the mounting hole for lifting, a sampling barrel 16 for sampling is slidably installed above the lifting plate 10, a filter screen 5 for preventing aquatic plants is arranged on the outside of the sampling barrel 16, a plurality of scraping strips 22 for cleaning the filter screen 5 are abutted on the outside of the filter screen 5, the scraping strips 22 are fixedly connected to the lifting plate 10, floating air bags 2 are arranged on both sides of the hull 1, and an air pump 30 is also arranged on the hull 1, the air pump 30 is used for sampling the sampling barrel 16, and the output end of the air pump 30 is connected to the floating air bag 2.

[0023] In a specific implementation, when the lifting plate 10 is raised to the highest position, the bottom wall plate of the lifting plate 10 and the bottom wall plate of the hull 1 are located on the same horizontal plane, that is, the lifting plate 10 can be embedded in the bottom of the hull 1 .

[0024] As a further implementation scheme of the present invention, an inverted U-shaped gantry 13 is fixedly connected to the top of the hull 1, and the two ends of the gantry 13 are respectively fixedly connected to the two side wall panels of the mounting hole, and a second winding disk 34 is rotatably installed on the top of the gantry 13, and a winding rope 17 is fixedly connected to the second winding disk 34, and the end of the winding rope 17 away from the second winding disk 34 is connected to the sampling barrel 16, and a first motor 3 is fixedly connected to one side of the top of the gantry 13, and the output shaft of the first motor 3 is fixedly connected to a side wall panel of the second winding disk 34, and a circular hole is opened at the center of the gantry 13, and the winding rope 17 passes through the circular hole.

[0025] In a specific implementation, the top and the bottom of the circular hole are both provided with rounded corners, and the rounded corners are used to reduce the friction between the inner wall of the circular hole and the winding rope 17.

[0026] As a further embodiment of the present invention, the interior of the sampling barrel 16 is slidably connected to a piston plate 19, the top of the piston plate 19 is fixedly connected to a first column 18, the bottom of the piston plate 19 is fixedly connected to a second column 20, the end of the first column 18 away from the piston plate 19 passes through the top wall of the sampling barrel 16, and the end of the first column 18 away from the piston plate 19 is fixedly connected to the end of the winding rope 17 away from the second winding disk 34, the end of the second column 20 away from the piston plate 19 passes through the bottom wall of the sampling barrel 16, and the end of the second column 20 away from the piston plate 19 is fixedly connected to the top center of the lifting plate 10.

[0027] In a specific implementation, the lengths of the first column 18 and the second column 20 are both longer than the height of the sampling barrel 16 .

[0028] As a further implementation scheme of the present invention, a rotating groove is provided on the lifting plate 10, and a rotating ring with an inverted "T"-shaped cross-section is rotatably sleeved in the rotating groove. The filter screen 5 is fixedly connected to the top of the rotating ring, and the filter screen 5 is located on the outside of the sampling barrel 16. A water inlet for sampling is provided at the bottom of the sampling barrel 16, and a solenoid valve is provided in the water inlet. A plurality of scraper strips 22 are fixedly connected to the top wall panel of the lifting plate 10, and the scraper strips 22 are located on the outside of the rotating groove.

[0029] In a specific implementation, the rotating groove and the rotating ring are both arranged in an inverted "T" shape. During the process of sampling through the sampling barrel 16, the solenoid valve is opened, and when the water in the sampling barrel 16 is discharged, the solenoid valve is also opened.

[0030] It should be noted that a valve is provided on the top of the sampling barrel 16 . When the water in the sampling barrel 16 is discharged, the valve is opened to replenish air in the sampling barrel 16 .

[0031] As a further embodiment of the present invention, a hollow mounting column 27 is fixedly connected to the bottom wall panel of the lifting plate 10, and a rectangular sliding column 26 is slidably connected inside the mounting column 27. A return spring 28 is fixedly connected to the bottom of the rectangular sliding column 26, and one end of the return spring 28 away from the rectangular sliding column 26 is fixedly connected to the inner bottom wall panel of the mounting column 27. A rack 24 is fixedly connected to the top of the rectangular sliding column 26, and the top wall panel of the rack 24 is movably abutted against the bottom wall panel of the sampling barrel 16. The rack 24 is meshingly connected to a driving gear 25, and the driving gear 25 is fixedly connected to a transmission shaft, which is rotatably sleeved in a bracket, and the bracket is fixedly connected to the top wall panel of the lifting plate 10, and one end of the transmission shaft away from the driving gear 25 is fixedly connected to a bevel gear 23, and the bevel gear 23 is meshingly connected to a bevel gear ring 29, and the bevel gear ring 29 is fixedly connected to the inner wall of the filter 5.

[0032] In a specific implementation, a limit plate is provided at the bottom of the rectangular slide column 26, and the limit plate is slidably connected to the hollow part of the mounting column 27, and the limit plate is used to prevent the rectangular slide column 26 from being separated from the mounting column 27. After the sampling is completed, the water in the sampling barrel 16 is discharged by opening the solenoid valve, so that the reset spring 28 lifts the rack 24, thereby resetting the rectangular slide column 26. During the resetting process, the filter screen 5 is also driven to rotate in the opposite direction, so that the filter screen 5 can be cleaned for a second time.

[0033] As a further embodiment of the present invention, the top of the sampling barrel 16 is connected to an exhaust pipe 21, which is wound around the first winding disk 33. A hollow rotating column is arranged on the first winding disk 33. The end of the exhaust pipe 21 away from the sampling barrel 16 is connected to the hollow layer of the rotating column. A U-shaped frame is fixedly connected to one side of the gantry 13. The first winding disk 33 is rotatably connected in the U-shaped frame. The first winding disk 33 is transmission-connected to the second motor 4. The second motor 4 rotates synchronously with the first motor 3. The second motor 4 is fixedly connected to the outer wall of the U-shaped frame. The hollow layer of the rotating column is also connected to a connecting air pipe 36. The connecting air pipe 36 is rotatably sleeved in the hollow layer of the rotating column. The end of the connecting air pipe 36 away from the hollow layer of the rotating column is connected to an air pump 30.

[0034] In the specific implementation, the setting of the rotating column, the exhaust pipe 21, the connecting air pipe 36 and the first winding plate 33 is the existing technology, which is commonly seen in the fire hose winding plate, so that the water flow can still flow when the pipeline is wound. This technology is the existing technology and will not be disclosed in detail here.

[0035] As a further implementation scheme of the present invention, the input end of the air pump 30 is connected to an electromagnetic three-way valve 31, which is a two-input and one-output three-way valve, and its output end is connected to the input end of the air pump 30. One of its two input ends is connected to a connecting air pipe 36, and the other input end is connected to an external air pipe 32. One end of the external air pipe 32 away from the electromagnetic three-way valve 31 is connected to the outside atmosphere, and the connecting air pipe 36 is connected to the air pump 30 through the electromagnetic three-way valve 31.

[0036] In a specific implementation, by setting the electromagnetic three-way valve 31 , gas can be effectively added to the sealing airbag 14 and the floating airbag 2 , which is beneficial to ensure that the sealing airbag 14 and the floating airbag 2 are fully expanded.

[0037] As a further implementation scheme of the present invention, the tops of the two floating airbags 2 are connected with a U-shaped tube 8, and a connector 7 is provided on the U-shaped tube 8. The output end of the air pump 30 is connected with an air outlet pipe 9, and the end of the air outlet pipe 9 away from the air pump 30 is connected with the connector 7. A rectangular annular groove is provided at the bottom of the mounting hole, and a sealing airbag 14 is provided in the rectangular annular groove. The sealing airbag 14 is movably abutted against the lifting plate 10. Both sides of the sealing airbag 14 are connected with a first built-in tube 15, and the ends of the two first built-in tubes 15 away from the sealing airbag 14 are respectively connected with the two floating airbags 2, and a one-way air inlet valve is provided at the connection between the first built-in tube 15 and the floating airbag 2. Two second built-in tubes 35 are also connected with the two floating airbags 2 on both sides of the sealing airbag 14. The two second built-in tubes 35 are also respectively connected with the two floating airbags 2, and a one-way pressure valve is provided at the connection between the sealing airbag 14 and the second built-in tube 35.

[0038] In a specific implementation, a one-way pressure valve is provided with a preset pressure value. When the gas pressure in the sealing airbag 14 is higher than the preset pressure value, the one-way pressure valve opens. It should be noted that the one-way pressure valve can only allow the gas in the sealing airbag 14 to enter the floating airbag 2, and the one-way air inlet valve can only allow the gas in the floating airbag 2 to enter the sealing airbag 14.

[0039] As a further embodiment of the present invention, a turbofan 11 for driving the hull 1 forward is provided at one end of the bottom of the hull 1, and a steering plate 12 for controlling the steering of the hull 1 is provided at one end of the bottom of the hull 1 away from the turbofan 11.

[0040] In the specific implementation, by adding a signal receiver and a remote controller, the movement and sampling of the hull 1 can be remotely controlled, which is convenient for technicians to operate on the shore, and the hull 1 is set as an unmanned ship to reduce the resources consumed by sampling. This remote control technology is an existing technology, which is commonly used in the fields of remote control vehicles, remote control unmanned ships, etc., and will not be disclosed in detail here.

[0041] As a further implementation scheme of the present invention, both sides of the bottom end of the hull 1 away from the turbofan 11 are fixedly connected with "L"-shaped power air pipes 6, the two power air pipes 6 are respectively connected to the two floating air bags 2, and the ends of the two power air pipes 6 away from the two floating air bags 2 are toward the direction of the turbofan 11, and an air pressure valve is arranged inside the power air pipe 6.

[0042] In a specific implementation, the air pressure valve is provided with an air pressure preset value. When the air pressure in the floating airbag 2 is higher than the air pressure preset value, the air pressure valve opens. It should be noted that the air pressure preset value of the air pressure valve is equal to the pressure preset value of the one-way pressure valve.

[0043] Working principle of the present invention: When the present invention is in use, the device is first moved to the position where sampling is required by the turbofan 11. During this process, the moving direction of the hull 1 is controlled by the steering plate 12. After the hull 1 is moved to the water surface area where sampling is required, the first motor 3 and the second motor 4 are controlled to work, thereby driving the second winding disk 34 and the first winding disk 33 to rotate, so that the winding rope 17 and the exhaust pipe 21 can be loosened, so that the lifting plate 10 and the sampling bucket 16 can be lowered, and then lowered into the water, which is convenient for subsequent sampling work.

[0044] By setting the first winding disc 33 and the second winding disc 34, the device can effectively perform sampling work from underwater, and can effectively sample water at different depths. At the same time, by setting the lifting plate 10, the weeds on the bottom of the water can be effectively blocked, which is conducive to preventing underwater weeds or green algae and other debris from entering the sampling barrel 16, thereby causing the water in the sampling barrel 16 to be mixed with impurities, thereby affecting the effective detection and analysis of the ammonia nitrogen content in the water quality. And by setting the filter 5, the impurities on the side of the sampling barrel 16 in the water can also be effectively blocked, which is conducive to preventing the weeds and green algae on the side of the sampling barrel 16 from entering the sampling barrel 16 during the sampling process of the sampling barrel 16, which is conducive to further ensuring the cleanliness of the sampled water quality, so that the water taken from the sampling barrel 16 will not be mixed with impurities such as waterweed and green algae, and at the same time, it also avoids the situation where the water inlet is blocked by impurities such as waterweed and green algae.

[0045] During the sampling process, the air pump 30 is controlled to be turned on, and then the electromagnetic three-way valve 31 is controlled to connect the connecting air pipe 36 with the input end of the air pump 30. After the air pump 30 is turned on, it will draw air through the connecting air pipe 36 and the exhaust pipe 21, so that the exhaust pipe 21 can draw air from the sampling barrel 16, thereby reducing the air pressure above the piston plate 19 in the sampling barrel 16. When the air pump 30 is turned on, the electromagnetic valve is also controlled to be opened, so that water can enter the chamber below the piston plate 19 in the sampling barrel 16 from the water inlet, thereby completing the sampling work. During the sampling process, the lifting plate 10 remains relatively still in the water due to gravity, and after the gas in the sampling barrel 16 is extracted, it flows into the space below the piston plate 19 in the sampling barrel 16 along with the water flow. At this time, the sampling barrel 16 will move downward relative to the piston plate 19, allowing the water flow to enter the chamber below the piston plate 19 in the sampling barrel 16, thereby completing the water sampling work.

[0046] After the sampling barrel 16 moves downward, the bottom wall plate of the sampling barrel 16 will abut against the rack 24, and then push the rack 24 downward to move. During the movement of the rack 24, the rectangular sliding column 26 will be pushed downward, thereby compressing the return spring 28. When the rack 24 moves, it will also drive the driving gear 25 to rotate. After the driving gear 25 rotates, it will drive the bevel gear 23 to rotate through the transmission shaft, thereby causing the bevel gear 23 to drive the bevel gear ring 29 to rotate. After the rotation, the bevel gear ring 29 will drive the filter screen 5 to rotate. During the rotation of the filter screen 5, its outer wall will produce relative movement with the scraper bar 22, thereby enabling the scraper bar 22 to scrape off impurities such as weeds and green algae attached to the outer wall of the filter screen 5, which is beneficial to avoid the situation where the filter screen 5 is blocked by impurities such as weeds and green algae, thereby further ensuring the smooth progress of the water sampling work.

[0047] After being pumped away by the air pump 30, the air in the sampling barrel 16 will enter the air outlet pipe 9, then enter the U-shaped tube 8 through the air outlet pipe 9, and finally enter the floating airbag 2 through the U-shaped tube 8. On the one hand, it can enable the gas in the sampling barrel 16 to be discharged smoothly, and on the other hand, it can also cause the floating airbag 2 to expand, so as to increase the displacement of the hull 1, thereby increasing the buoyancy that the hull 1 can provide, which is conducive to avoiding the sinking of the hull 1.

[0048] After the gas enters the floating airbag 2, it will enter the sealing airbag 14 through the first built-in tube 15, so as to expand the sealing airbag 14. After the sampling work of the sampling barrel 16 is completed, the sampling barrel 16 and the lifting plate 10 are lifted by controlling the first motor 3 and the second motor 4 to rotate in the opposite direction. When the lifting plate 10 contacts the sealing airbag 14, since the sealing airbag 14 is in an expanded state, the sealing airbag 14 can effectively abut against the lifting plate 10, thereby effectively blocking the mounting hole, which is beneficial to improving the integrity of the hull 1, further improving the displacement of the hull 1, and then improving the buoyancy of the hull 1, thereby achieving the purpose of improving the stability of the hull 1.

[0049] During the process of the sealed airbag 14 being compressed in the expanded state, the air pressure in the sealed airbag 14 will gradually increase. When the water pressure in the sealed airbag 14 increases to the preset pressure value of the one-way pressure valve, the one-way pressure valve opens, so that the gas in the sealed airbag 14 enters the floating airbag 2, thereby further increasing the buoyancy of the device. After the sampling work is completed, the lifting plate 10 will still carry some water, which is conducive to maintaining the moisture in the installation hole. A small amount of water can help prevent impurities such as green algae in the water tank from solidifying and adhering to the lifting plate 10 due to drying. The wetting effect of a small amount of water facilitates the cleaning of water plants and green algae.

[0050] After the lifting plate 10 rises to fully abut against the sealing airbag 14, the external air pipe 32 is connected to the input end of the air pump 30 by controlling the electromagnetic three-way valve 31, and then the air pump 30 is controlled to continuously output air to the floating airbag 2, so that the floating airbag 2 is in a maximum expansion state, and the buoyancy of the hull 1 on the water surface is also in a maximum state. When the air pressure in the floating airbag 2 reaches the preset air pressure value of the air pressure valve, the air pressure valve opens, and the pressurized gas in the floating airbag 2 is discharged through the power air pipe 6. After being discharged, the gas will impact in the water, thereby providing power for the movement of the hull 1, and assisting the turbofan 11 to drive the hull 1 to move effectively, speeding up the hull 1 to return to the shore, shortening the sampling return time of the hull 1, and when sampling in an area far away from the shore of a large lake, the sampling return time can be shortened, thereby reducing the change in the internal ammonia nitrogen content of the sampled water due to the consumption of time.

[0051] During the process of the hull 1 moving toward the water surface and returning after sampling, the sampling barrel 16 can be tightly stretched between the lifting plate 10 and the gantry 13 through the setting of the first motor 3 and the lifting plate 10, which is beneficial to avoid the sampling barrel 16 from shaking during the movement of the hull 1, thereby avoiding the imbalance of the hull 1 caused by the shaking of the sampling barrel 16.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A negative pressure sampling device for an online water quality ammonia nitrogen analyzer, comprising a hull (1), characterized in that: A rectangular mounting hole is provided at the center of the hull (1), a lifting plate (10) is installed at the bottom of the mounting hole in a lifting manner, a sampling bucket (16) for sampling is slidably installed above the lifting plate (10), a filter screen (5) for preventing aquatic plants is provided on the outside of the sampling bucket (16), a plurality of scrapers (22) for cleaning the filter screen (5) are abutted on the outside of the filter screen (5), and the scrapers (22) are fixedly connected to the lifting plate (10), floating air bags (2) are provided on both sides of the hull (1), and an air pump (30) is also provided on the hull (1), the air pump (30) is used for sampling the sampling bucket (16), and the output end of the air pump (30) is connected to the floating air bag (2).

2. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 1 is characterized in that: An inverted U-shaped gantry (13) is fixedly connected to the top of the hull (1), and the two ends of the gantry (13) are respectively fixedly connected to the two side wall panels of the installation hole. A second winding disk (34) is rotatably installed on the top of the gantry (13), and a winding rope (17) is fixedly connected to the second winding disk (34). The end of the winding rope (17) away from the second winding disk (34) is connected to the sampling barrel (16). A first motor (3) is fixedly connected to one side of the top of the gantry (13), and the output shaft of the first motor (3) is fixedly connected to a side wall panel of the second winding disk (34). A circular hole is opened at the center of the gantry (13), and the winding rope (17) passes through the circular hole.

3. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 2 is characterized in that: The sampling barrel (16) is slidably connected to a piston plate (19) inside, the top of the piston plate (19) is fixedly connected to a first column (18), the bottom of the piston plate (19) is fixedly connected to a second column (20), one end of the first column (18) away from the piston plate (19) passes through the top wall of the sampling barrel (16), and one end of the first column (18) away from the piston plate (19) is fixedly connected to one end of the winding rope (17) away from the second winding disk (34), one end of the second column (20) away from the piston plate (19) passes through the bottom wall of the sampling barrel (16), and one end of the second column (20) away from the piston plate (19) is fixedly connected to the top center of the lifting plate (10).

4. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 3 is characterized in that: The lifting plate (10) is provided with a rotating groove, in which a rotating ring with an inverted "T"-shaped cross section is rotatably sleeved, a filter screen (5) is fixedly connected to the top of the rotating ring, and the filter screen (5) is located outside the sampling barrel (16), a water inlet for sampling is provided at the bottom of the sampling barrel (16), and a solenoid valve is provided in the water inlet, and a plurality of scraping strips (22) are fixedly connected to the top wall plate of the lifting plate (10), and the scraping strips (22) are located outside the rotating groove.

5. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 4 is characterized in that: A hollow mounting column (27) is fixedly connected to the bottom wall plate of the lifting plate (10); a rectangular sliding column (26) is slidably connected inside the mounting column (27); a return spring (28) is fixedly connected to the bottom of the rectangular sliding column (26); an end of the return spring (28) away from the rectangular sliding column (26) is fixedly connected to the inner bottom wall plate of the mounting column (27); a rack (24) is fixedly connected to the top of the rectangular sliding column (26); and the top wall plate of the rack (24) is connected to the take-off plate. The bottom wall of the sample barrel (16) is movably abutted, the rack (24) is meshedly connected with a driving gear (25), the driving gear (25) is fixedly connected with a transmission shaft, the transmission shaft is rotatably sleeved in a bracket, the bracket is fixedly connected to the top wall of the lifting plate (10), one end of the transmission shaft away from the driving gear (25) is fixedly connected with a bevel gear (23), the bevel gear (23) is meshedly connected with a bevel gear ring (29), and the bevel gear ring (29) is fixedly connected to the inner wall of the filter (5).

6. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 5, characterized in that: The top of the sampling barrel (16) is connected to an exhaust pipe (21), which is wound around a first winding disk (33). A hollow rotating column is arranged on the first winding disk (33). One end of the exhaust pipe (21) away from the sampling barrel (16) is connected to the hollow layer of the rotating column. A U-shaped frame is fixedly connected to one side of the gantry (13). The first winding disk (33) is rotatably connected in the U-shaped frame. The first winding disk (33) is transmission-connected to a second motor (4). The second motor (4) rotates synchronously with the first motor (3). The second motor (4) is fixedly connected to the outer wall of the U-shaped frame. The hollow layer of the rotating column is also connected to a connecting air pipe (36). The connecting air pipe (36) is rotatably sleeved in the hollow layer of the rotating column. One end of the connecting air pipe (36) away from the hollow layer of the rotating column is connected to an air pump (30).

7. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 6 is characterized in that: The input end of the air pump (30) is connected to an electromagnetic three-way valve (31). The electromagnetic three-way valve (31) is a two-input and one-output three-way valve. Its output end is connected to the input end of the air pump (30). One of its two input ends is connected to a connecting air pipe (36), and the other input end is connected to an external air pipe (32). One end of the external air pipe (32) away from the electromagnetic three-way valve (31) is connected to the outside atmosphere. The connecting air pipe (36) is connected to the air pump (30) through the electromagnetic three-way valve (31).

8. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 7, characterized in that: The tops of the two floating air bags (2) are connected to a U-shaped tube (8), a connector (7) is provided on the U-shaped tube (8), the output end of the air pump (30) is connected to an air outlet pipe (9), the end of the air outlet pipe (9) away from the air pump (30) is connected to the connector (7), a rectangular annular groove is provided at the bottom of the mounting hole, a sealing air bag (14) is provided in the rectangular annular groove, the sealing air bag (14) is movably abutted against the lifting plate (10), and both sides of the sealing air bag (14) are connected to a first inner Tubes (15) are placed, one end of the two first built-in tubes (15) away from the sealing airbag (14) is connected to the two floating airbags (2) respectively, and a one-way air inlet valve is provided at the connection point between the first built-in tubes (15) and the floating airbags (2). Two second built-in tubes (35) are also connected to the two sides of the sealing airbag (14), and the two second built-in tubes (35) are also connected to the two floating airbags (2) respectively. A one-way pressure valve is provided at the connection point between the sealing airbag (14) and the second built-in tubes (35).

9. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 8, characterized in that: A turbofan (11) for driving the hull (1) forward is provided at one end of the bottom of the hull (1), and a steering plate (12) for controlling the steering of the hull (1) is provided at one end of the bottom of the hull (1) away from the turbofan (11).

10. The negative pressure sampling device of the water quality ammonia nitrogen online analyzer according to claim 9, characterized in that: Both sides of the end of the bottom of the hull (1) away from the turbofan (11) are fixedly connected with "L"-shaped power air pipes (6), the two power air pipes (6) are respectively connected to the two floating air bags (2), and the ends of the two power air pipes (6) away from the two floating air bags (2) are oriented toward the turbofan (11), and an air pressure valve is provided inside the power air pipes (6).

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