Ammonia nitrogen online analyzer for water quality detection

Abstract

The invention relates to the technical field of ammonia nitrogen analyzers, in particular to an ammonia nitrogen online analyzer for water quality detection, which comprises a colorimetric pool and an analyzer case, a detection analysis tank is fixed on the side of the analyzer case, the colorimetric pool is arranged on the inner bottom wall of the detection analysis tank, and a frame plate is slidably mounted in the detection analysis tank. A pipe frame plate is mounted in the frame plate in a lifting manner through a walking mechanism arranged at the bottom of the frame plate, and a plurality of placing holes for allowing colorimetric pipes to be inserted are formed in the pipe frame plate at intervals. Ammonia nitrogen reagent feeding, shaking up, intubation correction and intubation colorimetric analysis are sequentially completed in the advancing path of the pipe frame plate, traditional manual operation is replaced, time and labor are saved, the automation degree is high, the pipe frame plate is provided with a plurality of containing holes, a plurality of colorimetric pipes can be inserted into the containing holes, a mechanical operation mode is combined, the device is suitable for ammonia nitrogen analysis of a plurality of water samples, and the automation degree is high. The method can easily cope with complicated operation procedures for analyzing multiple water samples, is low in operation error rate, and effectively improves the water quality ammonia nitrogen analysis efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ammonia nitrogen analyzers, and in particular to an ammonia nitrogen online analyzer for water quality detection. Background Art

[0002] Because ammonia nitrogen is an important indicator of eutrophication of water bodies, excessive ammonia nitrogen will lead to the consumption of oxygen in the water body, affecting the survival of aquatic organisms and thus destroying the ecological balance. In addition, ammonia nitrogen can affect human health through drinking water. The purpose of ammonia nitrogen analysis and testing of water quality is to monitor the pollution status of water bodies. Therefore, regular sampling of water quality for ammonia nitrogen analysis helps to ensure water quality safety and take necessary treatment measures.

[0003] There are two main types of equipment for ammonia nitrogen analysis of water quality in the prior art. One is a large-scale ammonia nitrogen analysis device, which is mainly installed at water quality testing stations and corresponding points in rivers, lakes and reservoirs. It can automatically realize water sampling and water quality ammonia nitrogen analysis, and can issue an early warning when the ammonia nitrogen analysis is abnormal. The other is a small ammonia nitrogen analyzer, which is mainly used in water quality testing laboratories. The detection and analysis method is to collect water samples and bring them back to the laboratory, then place the water samples to be tested and the reaction reagents in a colorimetric tube for chemical reaction, and after a period of reaction, insert the colorimetric tube into the colorimetric cell of the ammonia nitrogen analyzer for colorimetric analysis.

[0004] However, the existing ammonia nitrogen analyzers used in laboratories have a low degree of automation and mainly rely on manual operations such as mixing, shaking, and inserting tubes for water samples and reaction reagents. This is time-consuming and labor-intensive, especially for testing and analyzing multiple water samples. It is necessary to frequently transfer water samples, reagents, and colorimetric test tubes for mixing, shaking, and inserting tubes. The steps are complicated, the operation is prone to errors, and the efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to provide an online ammonia nitrogen analyzer for water quality detection which has a high degree of automation and can detect and analyze multiple water samples, so as to solve the technical problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions.

[0007] An ammonia nitrogen online analyzer for water quality detection comprises a colorimetric cell and an analyzer chassis, a detection and analysis slot is fixed to the side of the analyzer chassis, the colorimetric cell is arranged on the bottom wall of the detection and analysis slot, a frame plate is slidably installed in the detection and analysis slot, a tube rack plate is lifted and installed in the frame plate through a walking mechanism arranged at the bottom thereof, a plurality of placement holes for inserting colorimetric tubes are arranged at intervals on the tube rack plate, a reagent delivery mechanism for delivering ammonia nitrogen reagents into each colorimetric tube in sequence is provided on the top of the detection and analysis slot, a lifting mechanism for sealing each colorimetric tube is installed above the tube rack plate through a pressure cover plate arranged on the top surface thereof, the pressure cover plate is used to drive the lifting mechanism to perform lifting and lowering adjustment, a driving mechanism for driving the frame plate to feed and retract is jointly provided on the bottom of the frame plate and the inner side wall of the detection and analysis slot, and reagent delivery, shaking and intubation colorimetry of each colorimetric tube are completed in sequence on the feeding path of the frame plate.

[0008] During the travel path of the tube rack plate, the ammonia nitrogen reagent is added, shaken, the tube is inserted for calibration, and the tube is inserted for colorimetric analysis. This replaces traditional manual operations, saves time and effort, and has a high degree of automation. Multiple placement holes are set on the tube rack plate, and multiple colorimetric tubes can be inserted. Combined with the mechanical operation mode, it is suitable for ammonia nitrogen analysis of multiple water samples, can easily cope with the complicated operation process of multiple water sample analysis, has a low operation error rate, and effectively improves the efficiency of ammonia nitrogen analysis of water quality.

[0009] Preferably, the reagent delivery mechanism includes a reagent storage tank, a delivery device and a guide tube group. An inverted L-shaped mounting frame is fixed to one side of the top of the detection and analysis tank. At least two reagent storage tanks are fixedly installed on the reagent storage tank. A delivery device is commonly provided on the discharge outlet at the bottom of the reagent storage tank. A guide tube group is commonly provided on the bottom end of the discharge outlet of the reagent storage tank. The delivery device is used to guide the ammonia nitrogen reagent in each reagent storage tank into the guide tube group respectively. The guide tube group is used to sequentially transport and deliver the ammonia nitrogen reagent into each colorimetric tube during the feeding process of the tube rack plate.

[0010] Preferably, the dispensing device includes a valve ball, a shaft, a driven gear, a driving motor and a main gear. A valve ball is rollingly installed in the discharge port at the bottom of each reagent storage tank, and each valve ball is provided with a temporary storage cavity for containing the reagent. The shaft is rotatably installed between the reagent storage tanks, and the shaft extends through each discharge port and is fixedly connected to each valve ball. The driven gear is fixedly sleeved on the shaft, and the driving motor is fixed to the outer wall of one of the reagent storage tanks through a support. The main gear is fixed to the output shaft of the driving motor and is correspondingly meshed with the driven gear.

[0011] Preferably, the guide tube group is composed of two metal delivery pipes, both of which are downwardly inclined and bent in multiple sections. The top ends of the two metal delivery pipes are respectively connected to the discharge outlets of the corresponding reagent storage tanks. The two metal delivery pipes gradually converge near the bottom ends and the outer walls are fitted and fixed. The top opening of the colorimetric tube is sufficient to cover the bottom ports of the two metal delivery pipes. The openings of the two temporary storage cavities are in opposite directions, and in one rotation cycle of the shaft, the temporary storage cavity away from the side of the analyzer chassis delivers the reagent into the corresponding metal delivery pipe before the other temporary storage cavity.

[0012] Preferably, the walking mechanism includes a rack, a driving motor and a driving gear. Slide rails extending along the length direction of the detection and analysis slot are fixed to the inner walls on both sides. The frame plate is installed on the two slide rails with limited sliding. A rack extending along the length direction of the detection and analysis slot is fixed to the inner wall on one side. The driving motor is fixed to the lower surface of the frame plate, and the driving gear is fixed to the output shaft of the driving motor and is meshed with the rack accordingly.

[0013] Preferably, the driving mechanism includes a first electric push cylinder, a connecting plate and a connecting arm. Two vertically extending first electric push cylinders are symmetrically fixed on both sides of the lower surface of the frame plate. Connecting plates are fixed on the ends of the telescopic rods of the two first electric push cylinders. Connecting arms extending vertically upward are fixed on the two connecting plates, and the top ends of the two connecting arms are fixed to the lower surface of the pipe rack plate.

[0014] Preferably, the lifting mechanism includes a stand fixed vertically above the pipe rack plate, a suspension fixed to the top of the stand, and a second electric push cylinder vertically fixed to the suspension, and the pressure cover plate is installed on the end of the telescopic rod of the second electric push cylinder.

[0015] Preferably, a plug-in component with a rectangular cross-section is fixed on the end face of the telescopic rod of the second electric push cylinder, a card hole is provided on the side of the plug-in component, a plug-in hole is provided on the top of the pressure cover plate for the plug-in component to be inserted into, a sliding hole is provided on the side of the pressure cover plate, a pin is slidably inserted in the sliding hole, and the end of the pin is matched and inserted in the card hole.

[0016] Preferably, the lower surface of the pressure cover plate is evenly distributed with a number of receiving holes corresponding to the positions of the colorimetric tubes, and a sealing gasket made of rubber is fixed on the top wall of each receiving hole. The top of the colorimetric tubes can be aligned one by one and inserted into the receiving holes and squeezed and fit with the sealing gaskets. When the colorimetric tubes are inserted into the colorimetric cell for colorimetric comparison, the top of the colorimetric tubes are aligned one by one and inserted into the receiving holes and squeezed and fit with the sealing gaskets, and at the same time, the tube rack plate covers and presses tightly on the top of the colorimetric cell.

[0017] Preferably, a display screen for displaying analysis and collection data is provided on the analyzer chassis, and a data transmission module is provided in the analyzer chassis, which is used to send the analysis and acquisition data to the laboratory data storage center, PC and user terminal to realize online data processing and analysis.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0019] The present invention sequentially completes the addition of ammonia nitrogen reagents, shaking, intubation calibration and intubation colorimetric analysis in the travel path of the tube rack plate, replacing traditional manual operations, saving time and labor, and having a high degree of automation. A plurality of placement holes are arranged on the tube rack plate, and a plurality of colorimetric tubes can be inserted. Combined with a mechanical operation mode, it is suitable for ammonia nitrogen analysis of a plurality of water samples, can easily cope with the complicated operation process of multiple water sample analysis, has a low operation error rate, and effectively improves the efficiency of ammonia nitrogen analysis of water quality.

[0020] Before shaking, the present invention pushes the pressure cover plate downward through the operation of the lifting mechanism until the tops of the colorimetric tubes are aligned one by one and inserted into the containing holes, and are pressed and fitted with the sealing gaskets. The pressure cover plate can be used to seal the tops of the colorimetric tubes at the same time to avoid leakage during shaking, saving time for plugging the plugs on the colorimetric tubes one by one, and further improving the operating efficiency. The sealing gasket is a rubber product with a soft texture and the ability to deform. When the tops of the colorimetric tubes are pressed on the sealing gasket, the sealing gasket undergoes adaptive deformation, effectively ensuring the sealing of the colorimetric tubes, and having a good leak-proof effect.

[0021] The present invention utilizes a tube rack plate to cover and press tightly on the top of the colorimetric cell to achieve a shading effect. The top of the colorimetric tube is inserted into the containing hole and squeezed and fitted with a sealing gasket to cover the light leakage area on the top of the colorimetric tube, replacing the traditional shading plate to provide an effective shading effect above the colorimetric cell, eliminating the design of an additional shading plate, and making the shading operation simpler. In addition, the sealing gasket is used to effectively seal the top of the colorimetric tube to prevent the water sample in the colorimetric tube from being contaminated or volatilized, thereby ensuring the purity and stability of the water sample, thereby killing two birds with one stone.

[0022] The present invention works by driving a motor, and its output shaft drives the main gear to rotate. The rotating main gear meshes with the driven gear and drives the shaft to rotate. Under the connection of the shaft, the two valve balls are driven to rotate. During one rotation cycle of the two valve balls, when the temporary storage chamber rotates to an opening facing upward, the reagent in the reagent storage tank flows into the temporary storage chamber for temporary storage. As the valve ball continues to rotate until the temporary storage chamber opens downward, the reagent temporarily stored in the temporary storage chamber flows downward into the guide tube group, and flows into the colorimetric tube through the guide tube group, thereby realizing the release of the reagent. Since the capacity of the temporary storage chamber is constant, the amount of reagent released each time is roughly the same, thereby realizing quantitative addition of the reagent, and the rotation of the two valve balls shares the same driving source, thereby reducing the investment in driving cost.

[0023] The present invention designs two metal delivery pipes, which can separately guide and transport two reagents for delivery, so as to avoid pre-mixing reaction of the two reagents before entering the colorimetric tube due to sharing the same pipe. The two temporary storage chambers are designed in reverse, so that when one of the temporary storage chambers is facing upward to deliver the reagent, the other temporary storage chamber is facing upward to stop delivering the reagent. After the first reagent is delivered, the state is maintained for a suitable period of time, and then the two valve balls are driven by the driving motor to continue rotating until the second reagent is delivered, so as to avoid the reaction and deterioration caused by the short interval between the delivery of the two reagents, thereby effectively improving the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is one of the schematic diagrams of the local structure of the detection and analysis tank in the present invention; Figure 3 This is the second schematic diagram of the local structure of the detection and analysis tank in the present invention; Figure 4 It is a schematic diagram of the structure of the pipe rack plate in the present invention; Figure 5 It is a schematic diagram of the structure of the walking mechanism in the present invention; Figure 6 It is a schematic diagram of the reagent delivery mechanism in the present invention; Figure 7 It is a schematic cross-sectional view of a local structure of the reagent delivery mechanism in the present invention; Figure 8 It is a detailed structural diagram of the driving mechanism in the present invention; Fig. 9 It is a schematic diagram of the detailed structure installation of the gland plate in the present invention; Fig.10 This is a structural schematic diagram of the colorimetric tube being inserted into the colorimetric cell for detection and analysis.

[0025] In the figure: 1, analyzer chassis; 101, colorimetric cell; 102, colorimetric tube; 2, detection and analysis slot; 21, slide rail; 3, frame plate; 4, tube rack plate; 41, placement hole; 5, driving mechanism; 51, first electric push cylinder; 52, connecting plate; 53, connecting arm; 6, walking mechanism; 61, rack; 62, driving motor; 63, driving gear; 7, reagent delivery mechanism; 71, mounting frame; 72, reagent storage tank; 73, delivery device 731, valve ball; 732, temporary storage chamber; 733, shaft; 734, driven gear; 735, drive motor; 736, main gear; 74, guide tube assembly; 741, metal delivery pipe; 8, lifting mechanism; 81, stand; 82, suspension; 83, second electric push cylinder; 84, plug-in; 841, card hole; 9, cover plate; 901, plug-in hole; 902, sliding hole; 903, latch; 91, capacity hole; 92, sealing gasket. DETAILED DESCRIPTION

[0026] See also Figure 1-Figure 10 The present invention provides an online ammonia nitrogen analyzer for water quality detection. The embodiments of the present invention are described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection" and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "connection" can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed" means that they are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0028] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0029] In the embodiments of the present invention, "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present invention. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] The ammonia nitrogen online analyzer includes a colorimetric cell 101 and an analyzer case 1. A detection and analysis slot 2 is fixed to the side of the analyzer case 1. The cross-section of the detection and analysis slot 2 is U-shaped. The colorimetric cell 101 is arranged on the bottom wall of the detection and analysis slot 2. A display screen (not marked in the figure) is provided on the analyzer case 1. The data analyzed by the colorimetric cell 101 can be transmitted to the display screen for display. In addition, a control button (not marked in the figure) is also provided on the analyzer case 1 to facilitate operation control. The data display and operation control adopt the existing technology, which will not be described in detail. A data transmission module (not shown in the figure) is provided in the analyzer case 1. The data transmission module adopts a wireless transmission method, which can transmit the data obtained by the analysis to the laboratory data storage center, PC terminal and user terminal to realize online data processing and analysis, and facilitate data processing, viewing, archiving and printing. The specific data transmission method adopts the existing technology and will not be disclosed in detail.

[0032] A frame plate 3 is slidably installed in the detection and analysis slot 2, and a tube rack plate 4 is lifted and installed in the frame plate 3 through a walking mechanism 6 arranged at the bottom thereof. A plurality of placement holes 41 for inserting the colorimetric tube 102 are arranged at intervals on the tube rack plate 4. The top of the colorimetric tube 102 has a convex neck, and the outer diameter of the convex neck is larger than the aperture of the placement hole 41. After the colorimetric tube 102 is matched and inserted into the placement hole 41, the convex neck contacts the upper surface of the tube rack plate 4, thereby playing a blocking and supporting effect, thereby preventing the colorimetric tube 102 from sliding downward in the placement hole 41.

[0033] There are multiple placement holes 41, which can hold multiple colorimetric tubes 102 at the same time, so as to facilitate the analysis and detection of multiple water samples. In addition, before inserting the colorimetric tubes 102 into each placement hole 41, it is necessary to transfer the distilled water and each water sample into each colorimetric tube 102 in turn according to the required amount, and it is necessary to ensure that the colorimetric tube 102 containing distilled water is in the first position.

[0034] A reagent dispensing mechanism 7 for dispensing ammonia nitrogen reagent into each colorimetric tube 102 in sequence is provided on the top of the detection and analysis tank 2; a lifting mechanism 8 for sealing each colorimetric tube 102 is installed above the tube rack plate 4 through a pressure cover plate 9 arranged on the top surface thereof; the pressure cover plate 9 is used to drive the lifting mechanism 8 to perform lifting and lowering adjustment; a driving mechanism 5 for driving the frame plate 3 to feed and retract is provided on the bottom of the frame plate 3 and the inner side wall of the detection and analysis tank 2; on the feeding path of the frame plate 3, the reagent dispensing, shaking and intubation colorimetry of each colorimetric tube 102 are completed in sequence.

[0035] After each colorimetric tube 102 filled with water is inserted into the corresponding placement hole 41, the walking mechanism 6 works to drive the frame plate 3, the tube rack plate 4 and the colorimetric tube 102 to feed toward one side of the analyzer chassis 1. During the feeding process, each colorimetric tube 102 passes through the reagent delivery mechanism 7 in turn, and the ammonia nitrogen reagent is delivered to each colorimetric tube 102 in turn by the reagent delivery mechanism 7 to achieve liquid preparation. After the ammonia nitrogen reagent is delivered to the last colorimetric tube 102, as the walking mechanism 6 continues to drive the frame plate 3 and the tube rack plate 4 to feed, before reaching the colorimetric pool 101, the lifting mechanism 8 works to drive the pressure cover plate 9 to press down on the tube rack plate 4, and the top of each colorimetric tube 102 is pressed and sealed. Then, the driving mechanism 5 works to drive the tube rack plate 4 and the pressure cover plate 9 to rise and fall synchronously, so that the prepared liquid in each colorimetric tube 102 can be shaken and kept still for a certain period of time.

[0036] Next, the frame plate 3 and the tube rack plate 4 are driven by the walking mechanism 6 to continue feeding. When the colorimetric tube 102 filled with distilled water at the first position is aligned with the colorimetric cell 101, the driving mechanism 5 drives the tube rack plate 4 to move downward, so that the colorimetric tube 102 is inserted into the colorimetric cell 101 for intubation correction to improve the accuracy of subsequent analysis. After the blank correction is completed, the driving mechanism 5 drives the tube rack plate 4 to move upward, driving the colorimetric tube 102 filled with distilled water to escape from the colorimetric cell 101, and then the walking mechanism is used to drive the tube rack plate 4 to move upward. 6 drives the frame plate 3 and the tube rack plate 4 to continue feeding until the colorimetric tube 102 at the second position is aligned with the colorimetric cell 101, and then the driving mechanism 5 drives the tube rack plate 4 to move downward, driving the colorimetric tube 102 at the second position to be inserted into the colorimetric cell 101 for colorimetric analysis. After the colorimetric analysis is completed, the driving mechanism 5 drives the tube rack plate 4 to move upward, driving the colorimetric tube 102 at the second position to be removed from the colorimetric cell 101, and the process is repeated until the insertion and colorimetric analysis of all colorimetric tubes 102 are completed.

[0037] In the travel path of the tube rack plate 4, the present invention sequentially completes the addition of ammonia nitrogen reagent, shaking, intubation calibration and intubation colorimetric analysis, replacing traditional manual operation, saving time and labor, and having a high degree of automation. A plurality of placement holes 41 are arranged on the tube rack plate 4, and a plurality of colorimetric tubes 102 can be inserted. Combined with the mechanical operation mode, it is suitable for ammonia nitrogen analysis of multiple water samples, can easily cope with the complicated operation process of multiple water sample analysis, has a low operation error rate, and effectively improves the efficiency of water quality ammonia nitrogen analysis.

[0038] When the conventional ammonia nitrogen analyzer is in operation, after the liquid preparation is completed, the stopper needs to be inserted into the colorimetric tube 102 to prevent liquid leakage during shaking. When multiple water samples are analyzed and tested, multiple stoppers need to be tightly plugged, which is complicated, time-consuming and laborious. In order to solve this problem, the present invention makes the following improvements: like Fig. 9 and Fig.10 As shown, the lower surface of the pressure cover plate 9 is evenly distributed with a number of receiving holes 91 corresponding to the position of the colorimetric tubes 102, and a sealing gasket 92 made of rubber is fixed on the top wall of each receiving hole 91. The top of the colorimetric tube 102 can be aligned one by one and inserted into the receiving hole 91, and squeezed and fitted with the sealing gasket 92. Before shaking, the pressure cover plate 9 is pushed downward by the lifting mechanism 8 until the top of each colorimetric tube 102 is aligned one by one and inserted into the receiving hole 91, and squeezed and fitted with the sealing gasket 92. The pressure cover plate 9 can be used to seal the top of each colorimetric tube 102 at the same time to avoid leakage during shaking, save time for plugging the stoppers on the colorimetric tubes 102 one by one, and further improve the operating efficiency. The sealing gasket 92 is a rubber product with a soft texture and the ability to deform. When the top of the colorimetric tube 102 is squeezed on the sealing gasket 92, the sealing gasket 92 undergoes adaptive deformation, which effectively ensures the sealing of the colorimetric tube 102 and has a good leak-proof effect.

[0039] In addition, a shading plate is also provided on the top of the colorimetric area of ​​the conventional ammonia nitrogen analyzer to prevent interference of the contrasting color by external light. However, the shading plate needs to be flipped open and closed for adjustment each time the cannula is inserted, which is very troublesome. In order to solve this problem, the present invention makes the following improvements: like Fig.10As shown, when the colorimetric tube 102 is inserted into the colorimetric cell 101 for colorimetric comparison, the tops of the colorimetric tubes 102 are aligned one by one and inserted into the containing holes 91 and squeezed and fitted with the sealing gasket 92. At the same time, the tube rack plate 4 is covered and pressed on the top of the colorimetric cell 101. The tube rack plate 4 is covered and pressed on the top of the colorimetric cell 101 to achieve a shading effect. The top of the colorimetric tube 102 is inserted into the containing hole 91 and squeezed and fitted with the sealing gasket 92 to cover the light leakage area on the top of the colorimetric tube 102, replacing the traditional shading plate to provide an effective shading effect on the top of the colorimetric cell 101, eliminating the design of an additional shading plate, making the shading operation easier. In addition, the sealing gasket 92 is used to effectively seal the top of the colorimetric tube 102 to prevent the water sample in the colorimetric tube 102 from being contaminated or volatilized, thereby ensuring the purity and stability of the water sample, killing two birds with one stone.

[0040] like Figure 6 and Figure 7 As shown, the reagent delivery mechanism 7 includes a reagent storage tank 72, a delivery device 73 and a guide tube group 74. An inverted L-shaped mounting frame 71 is fixed to one side of the top of the detection and analysis tank 2. At least two reagent storage tanks 72 are fixedly installed on the reagent storage tank 72. In the present application, two reagent storage tanks 72 are selected to be set, and the types of ammonia nitrogen reagents stored in the two reagent storage tanks 72 are different. A delivery device 73 is commonly provided on the discharge outlet (not marked in the figure) at the bottom of the reagent storage tank 72, and a guide tube group 74 is commonly provided on the bottom end of the discharge outlet of the reagent storage tank 72. The delivery device 73 is used to guide the ammonia nitrogen reagents in each reagent storage tank 72 to the guide tube group 74 respectively. The guide tube group 74 is used to sequentially transport and deliver the ammonia nitrogen reagents to each colorimetric tube 102 during the feeding process of the tube rack plate 4.

[0041] Specifically, the dispensing device 73 includes a valve ball 731, a shaft 733, a driven gear 734, a driving motor 735 and a main gear 736. A valve ball 731 is rollingly installed in the discharge port at the bottom of each reagent storage tank 72. Each valve ball 731 is provided with a temporary storage chamber 732 for containing the reagent. The shaft 733 is rotatably installed between the reagent storage tanks 72, and the shaft 733 extends through each discharge port and is fixedly connected to each valve ball 731. The driven gear 734 is fixedly sleeved on the shaft 733. The driving motor 735 is fixed to the outer wall of one of the reagent storage tanks 72 through a support (not marked in the figure). The main gear 736 is fixed to the output shaft of the driving motor 735 and is correspondingly meshed with the driven gear 734.

[0042] By driving the motor 735, its output shaft drives the main gear 736 to rotate, and the rotating main gear 736 engages and drives the driven gear 734 and drives the shaft 733 to rotate, and the two valve balls 731 are driven to rotate under the connection of the shaft 733. During a rotation cycle of the two valve balls 731, when the temporary storage chamber 732 rotates to an opening facing upward, the reagent in the reagent storage tank 72 flows into the temporary storage chamber 732 for temporary storage. As the valve ball 731 continues to rotate until the temporary storage chamber 732 opens downward, the reagent temporarily stored in the temporary storage chamber 732 flows downward into the guide tube group 74, and flows into the colorimetric tube 102 through the guide tube group 74, so as to realize the release of the reagent. Since the capacity of the temporary storage chamber 732 is fixed, the amount of reagent released each time is roughly the same, so as to realize the quantitative addition of the reagent, and the rotation of the two valve balls 731 shares the same driving source, so as to reduce the investment in driving cost.

[0043] In addition, if the dosage of the two reagents is different, the capacities of the two temporary storage chambers 732 are designed differently, so that the single dosage of each reagent is different.

[0044] When using a conventional ammonia nitrogen analyzer for colorimetric analysis, the two ammonia nitrogen reagents are added in a certain order, and the interval between the two reagents is kept for a long time, in order to avoid the two reagents being added to the colorimetric tube 102 with a short interval and causing an interaction reaction, thereby affecting the accuracy of the test result. In order to solve this problem, the present invention has made the following improvements: like Figure 6 and Figure 7 As shown, the guide pipe group 74 is composed of two metal delivery pipes 741, both of which are inclined and bent downward in multiple sections. The top ends of the two metal delivery pipes 741 are respectively connected to the discharge outlets of the corresponding reagent storage tanks 72. The metal delivery pipes 741 are inclined and bent downward in multiple sections to adapt to the height of the colorimetric tube 102 and facilitate the downward diversion of the reagents. By designing two metal delivery pipes 741, the two reagents can be separately guided, transported and delivered, avoiding sharing the same pipe and causing the two reagents to have a pre-mixing reaction before entering the colorimetric tube 102.

[0045] In addition, the two metal delivery pipes 741 gradually converge near the bottom and the outer walls are fixed together. The top opening of the colorimetric tube 102 is large enough to cover the bottom ports of the two metal delivery pipes 741, ensuring that the two metal delivery pipes 741 can accurately deliver the reagents into the colorimetric tube 102 to avoid leakage.

[0046] Furthermore, the metal delivery pipe 741 is a metal pipe with a high structural strength and will not bend, twist, or dent to affect the normal flow and delivery of the reagent.

[0047] The openings of the two temporary storage chambers 732 face opposite directions, and in one rotation cycle of the shaft 733, the temporary storage chamber 732 on the side away from the analyzer chassis 1 delivers the reagent into the corresponding metal delivery pipe 741 before the other temporary storage chamber 732. The two temporary storage chambers 732 are designed in reverse, so that when one of the temporary storage chambers 732 is facing upward to deliver the reagent, the other temporary storage chamber 732 stops delivering the reagent. After the first reagent is delivered, this state is maintained for a suitable period of time, and then the two valve balls 731 are driven by the driving motor 735 to continue rotating until the second reagent is delivered, thereby avoiding the reaction and deterioration caused by the short interval between the delivery of the two reagents.

[0048] Specifically, the walking mechanism 6 includes a rack 61, a driving motor 62 and a driving gear 63. The inner walls on both sides of the detection and analysis slot 2 are fixed with slide rails 21 extending along the length direction thereof. The frame plate 3 is slidingly installed on the two slide rails 21 with limited position. A rack 61 extending along the length direction is fixed on the inner wall of one side of the detection and analysis slot 2. The driving motor 62 is fixed on the lower surface of the frame plate 3. The driving gear 63 is fixed on the output shaft of the driving motor 62 and meshes with the rack 61 accordingly. When the driving motor 62 works, its output shaft drives the driving gear 63 to rotate, and the rotating driving gear 63 meshes with the rack 61 for transmission, which can reversely drive the frame plate 3 to slide along the slide rail 21, thereby providing stable drive for the feeding and retraction of the pipe rack plate 4.

[0049] In addition, the walking mechanism 6 is arranged in the detection and analysis slot 2 and is located below the frame plate 3, so that the walking mechanism 6 is hidden. The frame plate 3, the pipe rack plate 4 and the detection and analysis slot 2 can provide a protective effect for the walking mechanism 6 to avoid accidental contact and injury to people due to the exposed design of the walking mechanism 6.

[0050] Specifically, the driving mechanism 5 includes a first electric push cylinder 51, a connecting plate 52 and a connecting arm 53. Two vertically extending first electric push cylinders 51 are symmetrically fixed on both sides of the lower surface of the frame plate 3. Connecting plates 52 are fixed to the ends of the telescopic rods of the two first electric push cylinders 51. Connecting arms 53 extending vertically upward are fixed to the two connecting plates 52. The top ends of the two connecting arms 53 are fixed to the lower surface of the pipe rack plate 4. Through the telescopic operation of the first electric push cylinder 51, its telescopic rod can drive the pipe rack plate 4 to move synchronously under the connection action of the connecting plate 52 and the connecting arm 53, thereby providing stable drive for the lifting and lowering adjustment of the pipe rack plate 4.

[0051] Specifically, the lifting mechanism 8 includes a stand 81 vertically fixed above the pipe rack plate 4, a suspension 82 fixed to the top of the stand 81, and a second electric push cylinder 83 vertically fixed to the suspension 82. The pressure cover plate 9 is installed on the end of the telescopic rod of the second electric push cylinder 83. The second electric push cylinder 83 can work by telescoping, which can drive the pressure cover plate 9 to move synchronously, providing stable drive for the lifting and lowering adjustment of the pressure cover plate 9.

[0052] In addition, the first electric push cylinder 51 and the second electric push cylinder 83 may also be linearly driven elements such as air cylinders and hydraulic cylinders.

[0053] like Fig. 9 As shown, a plug-in piece 84 with a rectangular cross-section is fixed on the end face of the telescopic rod of the second electric push cylinder 83, and a card hole 841 is provided on the side of the plug-in piece 84. A plug-in hole 901 for the plug-in piece 84 to be inserted is provided on the top of the pressure cover plate 9, and a sliding hole 902 is provided on the side of the pressure cover plate 9. A latch 903 is slidably inserted in the sliding hole 902, and the end of the latch 903 is matched and inserted into the card hole 841. By inserting the plug-in piece 84 into the plug-in hole 901 and the latch 903 into the card hole 841, the pressure cover plate 9 and the end of the telescopic rod of the second electric push cylinder 83 are installed. This installation method has a detachable effect. After the detection and analysis are completed, the latch 903 is pulled out from the card hole 841, and the pressure cover plate 9 can be removed from the end of the telescopic rod of the second electric push cylinder 83, so that the pressure cover plate 9 can be cleaned to avoid the residual liquid on the hydraulic cover plate 9 from causing contamination to the next analysis.

[0054] In addition, the cross-section of the plug-in 84 is designed to be a rectangle, and the cross-section of the socket 901 is designed to be a rectangle that matches the plug-in 84. When the plug-in 84 is inserted into the socket 901, a positioning effect is achieved. On the one hand, it ensures that the latch 903 can be aligned and inserted into the card hole 841. On the other hand, it ensures that the position of the volume hole 91 corresponds to the position of the colorimetric tube 102.

[0055] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. An online ammonia nitrogen analyzer for water quality detection, comprising a colorimetric cell (101) and an analyzer chassis (1), characterized in that: A detection and analysis slot (2) is fixed to the side of the analyzer chassis (1), and the colorimetric cell (101) is arranged on the inner bottom wall of the detection and analysis slot (2); A frame plate (3) is slidably mounted in the detection and analysis tank (2), a tube rack plate (4) is lifted and lowered in the frame plate (3) via a walking mechanism (6) arranged at the bottom thereof, and a plurality of placement holes (41) for inserting colorimetric tubes (102) are provided at intervals on the tube rack plate (4); The top of the detection and analysis tank (2) is provided with a reagent delivery mechanism (7) for delivering the ammonia nitrogen reagent into each colorimetric tube (102) in sequence; A lifting mechanism (8) for sealing each of the colorimetric tubes (102) is installed above the tube rack plate (4) via a pressure cover plate (9) arranged on the top surface thereof, and the pressure cover plate (9) is used to drive the lifting mechanism (8) to perform lifting and lowering adjustment; A driving mechanism (5) for driving the frame plate (3) to advance and retract is provided on the bottom of the frame plate (3) and the inner wall of the detection and analysis slot (2); On the feeding path of the frame plate (3), reagent addition, shaking and tube insertion for colorimetric comparison are completed in sequence in each colorimetric tube (102).

2. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The reagent delivery mechanism (7) comprises a reagent storage tank (72), a delivery device (73) and a flow guide tube assembly (74); An inverted L-shaped mounting frame (71) is fixed to one side of the top of the detection and analysis tank (2), and at least two reagent storage tanks (72) are fixedly mounted on the reagent storage tank (72); The discharge outlet at the bottom of the reagent storage tank (72) is provided with the dispensing device (73), and the bottom end of the discharge outlet of the reagent storage tank (72) is provided with the guide pipe group (74); The dosing device (73) is used to guide the ammonia nitrogen reagent in each of the reagent storage tanks (72) into the guide pipe group (74); The guide tube group (74) is used to sequentially transport the ammonia nitrogen reagent into each colorimetric tube (102) during the feeding process of the tube rack plate (4).

3. The ammonia nitrogen online analyzer for water quality detection according to claim 2, characterized in that: The delivery device (73) comprises a valve ball (731), a shaft (733), a driven gear (734), a drive motor (735) and a main gear (736); The valve ball (731) is rollingly mounted in the discharge port at the bottom of each reagent storage tank (72), and each valve ball (731) is provided with a temporary storage cavity (732) for containing the reagent; The shaft rod (733) is rotatably mounted between the reagent storage tanks (72), and the shaft rod (733) extends through each discharge port and is fixedly connected to each valve ball (731); The driven gear (734) is fixedly sleeved on the shaft (733), the driving motor (735) is fixed to the outer wall of one of the reagent storage tanks (72) via a support, and the main gear (736) is fixed to the output shaft of the driving motor (735) and meshes with the driven gear (734) accordingly.

4. The ammonia nitrogen online analyzer for water quality detection according to claim 3, characterized in that: The guide pipe group (74) is composed of two metal delivery pipes (741) that are both inclined and bent downward in multiple sections. The top ends of the two metal delivery pipes (741) are respectively connected to the discharge outlets of the corresponding reagent storage tanks (72). The two metal delivery pipes (741) gradually converge near the bottom ends and the outer walls are fixed together. The top opening of the colorimetric tube (102) is sufficient to cover the bottom ports of the two metal delivery pipes (741). The openings of the two temporary storage chambers (732) face opposite directions, and during one rotation cycle of the shaft (733), the temporary storage chamber (732) on the side away from the analyzer chassis (1) delivers the reagent into the corresponding metal delivery pipe (741) before the other temporary storage chamber (732).

5. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The walking mechanism (6) comprises a rack (61), a driving motor (62) and a driving gear (63); Slide rails (21) extending along the length direction of the detection and analysis slot (2) are fixed to the inner walls on both sides thereof, and the frame plate (3) is mounted on the two slide rails (21) in a limited sliding manner; The rack (61) extending along the length direction of the detection and analysis slot (2) is fixed on one inner wall of the slot; The driving motor (62) is fixed to the lower surface of the frame plate (3), and the driving gear (63) is fixed to the output shaft of the driving motor (62) and meshes with the rack (61) accordingly.

6. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The driving mechanism (5) comprises a first electric push cylinder (51), a connecting plate (52) and a connecting arm (53); Two first electric push cylinders (51) extending vertically are symmetrically fixed on both sides of the lower surface of the frame plate (3), and the connecting plates (52) are fixed on the ends of the telescopic rods of the two first electric push cylinders (51); A connecting arm (53) extending vertically upward is fixed on each of the two connecting plates (52), and the top ends of the two connecting arms (53) are fixed to the lower surface of the pipe rack plate (4).

7. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The lifting mechanism (8) comprises a stand (81) vertically fixed above the pipe rack plate (4), a suspension (82) fixed at the top of the stand (81), and a second electric push cylinder (83) vertically fixed on the suspension (82); The gland plate (9) is mounted on the end of the telescopic rod of the second electric push cylinder (83).

8. The ammonia nitrogen online analyzer for water quality detection according to claim 7, characterized in that: An insert (84) with a rectangular cross section is fixed on the end surface of the telescopic rod of the second electric push cylinder (83), and a clamping hole (841) is provided on the side of the insert (84); The top of the pressure cover plate (9) is provided with an insertion hole (901) for the insertion member (84) to be matched and inserted, and the side of the pressure cover plate (9) is provided with a sliding hole (902), in which a latch (903) is slidably inserted, and the end of the latch (903) is matched and inserted into the clamping hole (841).

9. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The lower surface of the pressure cover plate (9) is evenly distributed with a plurality of receiving holes (91) corresponding to the positions of the colorimetric tubes (102), and a sealing gasket (92) made of rubber is fixed on the top wall of each receiving hole (91), so that the tops of the colorimetric tubes (102) can be aligned one by one and inserted into the receiving holes (91) and pressed and fitted with the sealing gaskets (92); When the colorimetric tube (102) is inserted into the colorimetric cell (101) for colorimetric comparison, the tops of the colorimetric tubes (102) are aligned one by one and inserted into the containing holes (91), and pressed and fitted with the sealing gasket (92), while the tube rack plate (4) is covered and pressed tightly against the top of the colorimetric cell (101).

10. The ammonia nitrogen online analyzer for water quality detection according to claim 1, characterized in that: The analyzer chassis (1) is provided with a display screen for displaying analyzed and collected data, and the analyzer chassis (1) is provided with a data transmission module; The data transmission module is used to send the data obtained from the analysis to the laboratory data storage center, PC and user terminal to realize online data processing and analysis.

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