Water quality total phosphorus analysis equipment

Abstract

The application relates to the technical field of water quality total phosphorus analysis, in particular to a water quality total phosphorus analysis equipment which comprises a rack, a test tube transfer device, a test tube cap screwing device, a reagent injection device, a sample mixing device, a sample digestion device and a spectrophotometric determination device. According to the application, the test tube transfer device automatically transfers the test tube at each stage of water quality total phosphorus analysis; the test tube cap screwing device timely unscrews or screws the test tube cap; the reagent injection device automatically injects corresponding reagents into the test tube at each stage; the sample mixing device simulates manual shaking to uniformly mix the reagents and the sample to be measured after the reagents are injected; the sample digestion device digests the sample to be measured in the test tube into a sample capable of water quality total phosphorus detection; and the spectrophotometric determination device detects the total phosphorus of the digested sample to be measured. The whole total phosphorus analysis process is realized through a full-automatic personification mode, the degree of automation is high, and the total phosphorus analysis efficiency and total phosphorus detection precision are improved.

Description

Technical Field

[0001] This application relates to the technical field of total phosphorus detection and analysis equipment, and in particular to a water quality total phosphorus analysis device. Background Technology

[0002] Total phosphorus analysis in water is an important analytical procedure for water quality testing. It involves digesting water samples to convert phosphorus into various forms of orthophosphate before determining the phosphorus content. Traditional total phosphorus analysis typically requires manual operation. The process includes multiple steps such as water sampling, adding digestion reagents, sample mixing, sample digestion, adding colorimetric reagents, spectrophotometric determination, and data analysis. Each step is almost entirely manual, especially the cumbersome and inefficient handling of test tube capping during reagent addition and spectrophotometric determination. This results in low efficiency for total phosphorus analysis. Furthermore, variations in operator technique can lead to discrepancies between standard digestion methods and accurate determinations of total phosphorus in water. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this application provides a water quality total phosphorus analysis device, which has the advantages of being able to perform total phosphorus determination in a fully automated manner, simulating manual operation, with high total phosphorus analysis efficiency and high total phosphorus determination accuracy.

[0004] According to an embodiment of this application, a water quality total phosphorus analysis device is provided, comprising: a frame, and a test tube transfer device, a test tube capping device, a reagent injection device, a sample mixing device, a sample digestion device, and a spectrophotometer disposed on the frame; the frame is provided with an operating platform, which includes a sample storage area, a sample digestion area, a sample mixing area, and a reagent addition area; the test tube transfer device is used to move test tubes between the sample storage area, the sample digestion area, the sample mixing area, and the reagent addition area; the test tube capping device is used to unscrew or tighten the test tube caps, and includes: a test tube cap clamping assembly and a test tube body rotating assembly. The test tube cap clamping assembly is installed at the cantilever end of the test tube transfer assembly and is used to clamp the test tube cap; the test tube body rotating assembly is installed in the reagent adding area and is used to clamp and rotate the test tube body to loosen or tighten the test tube body from the test tube cap; the reagent injection device is used to inject the corresponding reagents into the test tube containing the sample to be tested at each stage of the total phosphorus analysis of water quality; the sample mixing device is used to mix the reagents and the sample to be tested after the reagent injection; the sample digestion device is used to digest the sample to be tested in the test tube into a sample that can be used for the detection of total phosphorus in water quality; the spectrophotometer is used to perform total phosphorus detection on the sample to be tested after digestion by the sample digestion device.

[0005] In the technical solution of this application embodiment, compared with the traditional fully manual method of water quality total phosphorus analysis, the test tubes are automatically transferred at each stage of water quality total phosphorus analysis through a test tube transfer device; the test tube capping device is used to open or tighten the test tube caps in a timely manner; the reagent injection device is used to automatically inject the corresponding reagents into the test tubes at each stage; the sample mixing device simulates manual shaking to mix the reagents with the sample to be tested after the reagent injection; the sample digestion device digests the sample to be tested in the test tubes into a sample that can be used for water quality total phosphorus detection; and the spectrophotometer is used to detect the total phosphorus in the sample digestion device. The entire total phosphorus analysis process is realized in a fully automated, anthropomorphic manner, with a high degree of automation, which improves the efficiency of total phosphorus analysis and the accuracy of total phosphorus determination.

[0006] Furthermore, the test tube body is moved below the reagent injection device by the translation unit, while the dispensing needle of the reagent injection device is positioned directly above the inner wall of the test tube body. When the dispensing needle drips liquid onto the inner wall of the test tube, it can rest against the inner wall of the test tube. The rotating unit rotates the test tube body during each reagent injection stage, so as to add reagent while rotating the test tube body, reduce reagent residue on the reagent needle, and achieve complete addition of reagent, which helps to improve the accuracy of total phosphorus analysis.

[0007] Furthermore, the clamping and releasing of the test tube body is achieved through the structural design and synergistic interaction of the various components of the test tube body clamping unit, thereby better realizing the opening and closing of the test tube cap. This ensures that the test tube cap will not loosen during high-temperature digestion after being tightened, and that it can be opened smoothly when needed, thus improving the efficiency of opening and closing the test tube cap and improving the overall efficiency of total phosphorus analysis.

[0008] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application.

[0009] To better understand and implement this application, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0010] Figure 1 A perspective view of the water total phosphorus analysis equipment provided in the embodiments of this application;

[0011] Figure 2 A top view of the water total phosphorus analysis equipment provided in the embodiments of this application;

[0012] Figure 3 This is a schematic diagram of the test tube transfer device provided in the embodiments of this application;

[0013] Figure 4 A schematic diagram of the installation of the test tube cap clamping assembly provided in an embodiment of this application;

[0014] Figure 5 This is a schematic diagram illustrating the use of the test tube cap clamping assembly provided in an embodiment of this application;

[0015] Figure 6 This is a schematic diagram of the structure of the test tube cap clamping assembly provided in an embodiment of this application;

[0016] Figure 7 A bottom view of the test tube cap clamping assembly provided in an embodiment of this application;

[0017] Figure 8 A schematic diagram of the structure of the water quality total phosphorus analysis equipment provided in this application embodiment;

[0018] Figure 9-10 This is a schematic diagram of the installation of the test tube clamping unit, translation unit, and rotation unit provided in the embodiments of this application;

[0019] Figure 11 A schematic diagram of the installation of the test tube clamping unit provided in the embodiments of this application;

[0020] Figure 12 Exploded view of the test tube positioning mold and clamping block provided in the embodiments of this application;

[0021] Figure 13 A cross-sectional view of the test tube positioning mold and clamping block provided in the embodiments of this application;

[0022] Figure 14 This is a schematic diagram of the pivoting of the test tube clamping block provided in an embodiment of this application;

[0023] Figure 15 This is a schematic diagram of the structure of the slider mounting plate provided in the embodiments of this application;

[0024] Figure 16 This is a schematic diagram of the structure of the droplet assembly provided in the embodiments of this application;

[0025] Figure 17 A perspective view of the sample mixing device provided in the embodiments of this application;

[0026] Figure 18 This is a schematic diagram of the sample mixing device provided in the embodiments of this application;

[0027] Figure 19 The sample shaking device provided in the embodiments of this application is along Figure 2 A cross-sectional view along the AA direction;

[0028] Figure 20 for Figure 19 A magnified view of a portion of region A in the middle;

[0029] Figure 21 This application provides a schematic diagram of the test tube in a swinging state.

[0030] Icon labels:

[0031] 1000. Water quality total phosphorus analysis equipment; 100. Frame; 200. Test tube transfer device; 300. Sample mixing device; 31. Swing motor; 32. Drive shaft; 321. First mounting base; 33. Driven shaft; 331. Second mounting base; 34. First mounting plate; 341. Optical sensor; 342. First bearing; 35. Second mounting plate; 351. Second bearing; 36. Test tube holder; 361. Mounting groove; 362. Rubber ring; 363. Vent hole; 364. Observation hole; 365. First mounting position; 366. Second mounting position; 37. Steering disc; 38. Steering disc adapter block; 39. Steering gear mounting plate; 391. Mounting part; 392. Connecting part; 393. Supporting part; 400. Test tube capping device; 41. Test tube cap clamping assembly; 411. Electric gripper; 412. Test tube cap clamping piece; 413. Silicone sleeve; 4131. Reinforcing rib; 414. Three-axis robot; 4141. X-axis robot; 4142. X-axis motor; 4143. Y-axis robot; 4144. Y-axis motor; 4145. Z-axis robot; 4146. Z-axis motor; 42. Test tube body clamping unit; 421. Guide ring; 4211. Second positioning surface; 422. Test tube clamping block; 4221. Clamping seat; 4222. Clamping part; 4223. Clamping surface; 4224. First positioning Surface; 4225, First pivot shaft mounting hole; 423, Test tube positioning mold; 4231, Positioning base; 4232, Positioning claw; 4233, Connecting seat; 4234, Second pivot shaft mounting hole; 424, Polyurethane clamp; 425, Upper bearing mounting plate; 426, Upper bearing; 4271, Test tube sleeve; 4272, Dropping groove; 428, Pivot shaft; 43, Rotation unit; 431, Servo motor; 432, Dynamic torque sensor; 4331, First gear; 4332, Second gear; 434, Torque sensor mounting seat; 44, Translation unit; 441, Translation motor; 442, Translation guide rail; 443, Base plate; 444, Second screw Mother; 445, Slider assembly; 45, Lifting unit; 451, Base; 452, Guide rail mounting plate; 453, Lifting guide rail; 454, Slider mounting plate; 4541, Vertical mounting plate; 4542, Horizontal connecting plate; 455, Lifting motor; 456, First nut; 457, Bearing mounting seat; 458, Lower bearing; 4591, Photoelectric switch; 4592, Sensing plate; 500, Reagent injection device; 51, Dropping assembly; 511, Dropping needle; 52, Waste liquid cleaning tank; 600, Sample digestion device; 2000, Test tube; A, Sample storage area; B, Sample digestion area; C, Sample mixing area; D, Reagent addition area. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] This application discloses a water quality total phosphorus analysis device, which is used in experimental or industrial testing of water quality total phosphorus analysis. Specifically, it can be applied to water quality total phosphorus analysis in environmental chemistry, analytical chemistry and other scenarios. It adopts an anthropomorphic automation method to realize the steps of opening and closing the test tube cap and injecting reagents at each stage.

[0036] like Figure 1 and Figure 2As shown, the total phosphorus analysis equipment 1000 includes: a frame 100, and a test tube transfer device 200, a test tube capping device 400, a reagent injection device 500, a sample mixing device 300, a sample digestion device 600, and a spectrophotometer, all mounted on the frame 100. The frame 100 has an operating platform, which includes a sample storage area A, a sample digestion area B, a sample mixing area C, and a reagent addition area D. Optionally, each device or component of the total phosphorus analysis equipment has a different function, and the test tubes 2000 need to be transferred between the various devices. To shorten the test tube transfer path and improve the convenience of test tube transfer, the various areas on the operating platform need to be rationally planned. Specifically, the sample storage area A and the sample digestion area B can be arranged side by side, and the sample mixing area C can be located next to the sample storage area A. The reagent addition area D must have at least a capping position and a dispensing position. A test tube transfer device 200 is positioned above the operating platform and is used to grip test tubes 2000 and transfer them between the sample storage area A, sample digestion area B, sample mixing area C, and reagent addition area D. A test tube capping device 400 is located at the capping position in the reagent injection area and is used to open or tighten the test tube cap during reagent injection and spectrophotometric determination. The test tube capping device 400 includes a test tube cap clamping assembly 41 and a test tube body rotating assembly; the test tube cap clamping assembly 41 is installed at the cantilever end of the test tube transfer assembly and is used to clamp the test tube cap; the test tube body rotating assembly is installed in the reagent addition area D and is used to clamp and rotate the test tube body to loosen or tighten the test tube body from the test tube cap. A reagent injection device 500 is located in the reagent injection area and is used to inject the corresponding reagents into the test tube containing the sample at each stage of the total phosphorus analysis. For example, in the sample digestion stage, the digesting agent is injected into test tube 2000; in the dechlorination stage, the dechlorinating agent is injected into test tube 2000; and in the colorimetric stage, the colorimetric agent is injected into test tube 2000. A sample mixing device 300 is located in the sample mixing area C and is used to mix the reagent with the sample after reagent injection. A sample digestion device 600 is located in the sample digestion area B and is used to digest the sample in test tube 2000 into a sample suitable for total phosphorus detection. A spectrophotometer is used to detect total phosphorus in the sample digested by the sample digestion device 600.

[0037] To achieve automated control of the total phosphorus analysis equipment, the equipment also includes a main control unit (not shown), which can be mounted on the rack 100 or other operating platform. The main control unit establishes communication connections with the test tube transfer device 200, test tube capping device 400, reagent injection device 500, sample mixing device 300, sample digestion device 600, and spectrophotometer to enable real-time interaction during the total phosphorus analysis process. For example, the test tube transfer device 200, test tube capping device 400, reagent injection device 500, sample mixing device 300, sample digestion device 600, and spectrophotometer can receive control signals from the main control unit or send detection signals back to it. The communication connection between the main control unit and other devices can be wireless or wired. In this embodiment, the form of the main control device is not limited. The main control device can be a control board dedicated to controlling each stage of total phosphorus analysis, or it can be other intelligent devices, such as general-purpose computers, smart tablets, smartphones, smart bracelets, industrial control computers, etc., or it can be a cloud server or other virtual computers.

[0038] In the technical solution of this application embodiment, compared with the traditional manual method of water quality total phosphorus analysis, the test tube transfer device 2000 automatically transfers the test tube 2000 at each stage of water quality total phosphorus analysis; the test tube capping device 400 opens or tightens the test tube cap at appropriate times; the reagent injection device 500 automatically injects the corresponding reagent into the test tube 2000 at each stage; the sample mixing device 300 simulates manual shaking to mix the reagent with the sample to be tested after the reagent injection; the sample digestion device 600 digests the sample to be tested in the test tube 2000 into a sample that can be used for water quality total phosphorus detection; and the spectrophotometer performs total phosphorus detection on the sample to be tested after digestion by the sample digestion device 600. The entire total phosphorus analysis process is realized in a fully automated, anthropomorphic manner, with a high degree of automation, improving the efficiency of total phosphorus analysis and the accuracy of total phosphorus determination.

[0039] The following is a detailed description of each device and component of the total phosphorus analysis equipment.

[0040] like Figure 3As shown, the test tube transfer device 200 includes a three-axis robot arm 414, which comprises an X-axis robot arm 4141, a Y-axis robot arm 4143, and a Z-axis robot arm 4145. Each of the X-axis robot arm 4141, Y-axis robot arm 4143, and Z-axis robot arm 4145 is driven by an independent motor or servo motor 431 to achieve movement in the X, Y, and Z directions, thereby transferring the test tube 2000 in the X, Y, and Z directions. In this embodiment, the installation method of the X-axis robot arm 4141, Y-axis robot arm 4143, and Z-axis robot arm 4145 is not limited. In an optional embodiment, the Z-axis robot 4145 and the Z-axis motor 4146 driving the Z-axis robot 4145 to move up and down are mounted on the Y-axis robot 4143; the Y-axis robot 4143 and the Y-axis motor 4144 driving the Y-axis robot 4143 to move back and forth are mounted on the X-axis robot 4141; the X-axis robot 4141 and the X-axis motor 4142 driving the X-axis robot 4141 to move up and down are mounted on the frame 100. When transferring the test tube 2000, the main control device generates transfer signals according to the preset transfer path and transmits them to the corresponding motors of each robot, driving the motors to move the robot to transfer the test tube.

[0041] The test tube capping device 400 includes: a test tube cap clamping assembly 41 and a test tube body rotating assembly.

[0042] like Figure 4 As shown, the test tube cap clamping assembly 41 is installed at the end of the cantilever of the test tube transfer device 200, specifically at the end of the Z-axis manipulator 4145 of the three-axis manipulator 414 of the test tube transfer device 200, for clamping test tube caps. The test tube cap clamping assembly 41 includes an electrically driven gripper 411 installed at the end of the Z-axis manipulator 4145; the electrically driven gripper 411 is provided with two opposing test tube cap clamping pieces 412. Combined with... Figures 4 to 7 As you can see, the ends of the two test tube cap clamps 412 are positioned opposite each other and are respectively arc-shaped to form a test tube cap clamping space. After the two test tube cap clamps 412 clamp the test tube cap, the three-axis robot arm 414 moves the test tube cap clamps 412 and the clamped test tube 2000 upward to a preset height, and moves the test tube 2000 between the sample storage area A, the sample digestion area B, the sample mixing area C, and the reagent addition area D, thereby realizing the automated transfer of the sample to be tested.

[0043] When transferring test tube 2000 or opening / closing the test tube cap, the electric gripper 411 receives a control signal from the main control device, causing the test tube cap clamp 412 to clamp or release the test tube cap. Specifically, when the electric gripper 411 is driven by the three-axis robot 414 to descend and grip the test tube cap, the electric gripper 411 drives the test tube cap clamp 412 to clamp the test tube cap, thereby causing the three-axis robot 414 to move the entire test tube 2000 upward and transfer it to the preset position; thereafter, when the three-axis robot 414 drives the test tube 2000 to descend and lower the test tube 2000, the electric gripper 411 drives the test tube cap clamp 412 to release the test tube cap.

[0044] Furthermore, such as Figure 7 As shown, the shape and size of the test tube cap clamping space match the shape and size of the test tube 2000 used for total phosphorus analysis. To better clamp the test tube cap, the clamping space between the two cap clips 412 needs to match the shape of the test tube cap. Therefore, the two cap clips 412 are designed as arcs, specifically semicircles, with the two semicircular clips 412 facing each other. The electric gripper 411 moves the two cap clips 412 closer together to clamp the test tube cap and moves them further apart to release the cap. Optionally, the size of the clamping space between the two cap clips 412 can be configured to accommodate test tube caps of different sizes, i.e., to facilitate the transfer of test tubes of different sizes. Furthermore, to prevent the test tube 2000 from slipping during the test tube transfer process, and to prevent slippage during the test tube cap opening and closing process that could lead to ineffective cap opening or incomplete cap closing, silicone sleeves 413 are respectively fitted onto the ends of the test tube cap clamp 412. In addition, the side of the silicone sleeve 413 used to clamp the test tube cap has multiple raised reinforcing ribs 4131 evenly spaced along its longitudinal direction. When clamping the test tube cap, the silicone reinforcing ribs 4131 can better generate friction with the test tube cap, thereby better clamping the test tube cap.

[0045] like Figure 1 and Figure 8As shown, the test tube body rotation assembly is installed in the reagent adding area D, and is used to clamp and rotate the test tube body to loosen or tighten the test tube body from the test tube cap. In this embodiment, the test tube body rotation assembly includes a translation unit 44, a lifting unit 45, a rotation unit 43, and a test tube body clamping unit 42; the test tube body clamping unit 42 is mounted on the rotation unit 43, the rotation unit 43 is mounted on the lifting unit 45, and the lifting unit 45 is mounted on the translation unit 44. The translation unit 44 can drive the lifting unit 45, the rotation unit 43, and the test tube body clamping unit 42 thereon to move on the translation track of the translation unit 44, and the lifting unit 45 can drive the rotation unit 43 and the test tube body clamping unit 42 to move up and down to clamp or loosen the test tube body. Specifically, the translation unit 44 drives the rotation unit 43 and the test tube clamping unit 42 to move, causing the test tube to move within the reagent addition area D so that the test tube is positioned below the reagent injection device 500, and the dispensing needle 511 of the reagent injection device 500 is positioned above the inner wall of the test tube. When the dispensing needle 511 of the reagent injection device 500 dispenses liquid onto the inner wall of the test tube 2000, the dispensing needle 511 rests against the inner wall of the test tube 2000, and the rotation unit 43 drives the test tube to rotate. This reagent injection method of dispensing liquid while rotating the test tube can reduce the amount of reagent adhering to the inner wall of the test tube 2000 or the dispensing needle 511, making the reagent addition more complete and helping to improve the accuracy of total phosphorus analysis.

[0046] The following description will focus on each unit of the test tube rotating assembly.

[0047] In a preferred embodiment, in order to achieve support and clamping of the test tube body, such as Figures 9 to 15As shown, the test tube clamping unit 42 includes an upper bearing mounting plate 425, an upper bearing 426, a guide ring 421, multiple test tube clamping blocks 422, and a test tube positioning mold 423. The upper bearing mounting plate 425 is mounted on the translation unit 44 via a vertical plate (not shown). The upper bearing 426 is mounted on the upper bearing mounting plate 425, and the inner ring of the upper bearing 426 is fitted onto the outer wall of the guide ring 421. The guide ring 421 is rotatable, and the upper bearing 426 provides support for the guide ring 421. The test tube positioning mold 423 includes a positioning base 4231, which is mounted on the rotation unit 43. The test tube clamping block 422 includes a clamping seat 4221 and a clamping part 4222 mounted on the clamping seat 4221. The clamping seat 4221 forms a ring and is pivotally mounted on the positioning base 4231. The clamping part 4222 includes an inner clamping surface 4223 and an outer first positioning surface 4224. The multiple clamping surfaces 4223 enclose an annular clamping space for the test tube 2000. The inner wall of the guide ring 421 includes a second positioning surface 4211, and the clamping part 4222 extends into the inner side of the guide ring 421. Since the positioning base 4231 of the test tube positioning mold 423 is mounted on the rotating unit 43, and the rotating unit 43 is mounted on the lifting unit 45, when the lifting unit 45 drives the rotating unit 43 and the test tube positioning mold 423 thereon to rise or fall, the test tube clamping block 422 is driven to rise or fall through the test tube positioning mold 423. At this time, the first positioning surface 4224 of the test tube clamping block 422 and the second positioning surface 4211 of the inner side wall of the guide ring 421 are squeezed, so that the test tube clamping block 422 pivots inward or outward relative to the positioning base 4231, thereby causing the clamping space of the test tube 2000 formed by the clamping surface 4223 to become smaller or larger, so as to clamp or release the test tube 2000.

[0048] The clamping base 4221 forms a ring and is pivotally mounted on the positioning base 4231 via a pivot shaft 428. Specifically, the clamping base 4221 is provided with a first pivot shaft mounting hole 4225, and the positioning base 4231 is provided with a second pivot shaft mounting hole 4234. The second pivot shaft mounting hole 4234 corresponds to the first pivot shaft mounting hole 4225. The pivot shaft 428 passes through the second pivot shaft mounting hole 4234 and the first pivot shaft mounting hole 4225 for mounting, thereby allowing the clamping base 4221 to be pivotally mounted on the positioning base 4231. This allows the test tube clamping block 422 to pivot inward or outward relative to the positioning base 4231, thereby causing the clamping space of the test tube 2000 enclosed by the clamping surface 4223 to become smaller or larger, thus clamping or releasing the test tube 2000.

[0049] Furthermore, to better coordinate the test tube clamping block 422 with the guide ring 421, the second positioning surface 4211 is located below the inner wall of the guide ring 421, forming an inclined surface sloping outwards; the first positioning surface 4224 of the clamping part 4222 is an inclined surface corresponding to the second positioning surface 4211, and the clamping part 4222 extends into the inner side of the guide ring 421 from below. When the test tube positioning mold 423 drives the test tube clamping block 422 to rise or fall, the first positioning surface 4224 of the test tube clamping block 422 and the second positioning surface 4211 of the inner wall of the guide ring 421 can directly contact each other, thereby better cooperating with each other. When the test tube clamping block 422 is driven to rise, the first positioning surface 4224 moves toward the second positioning surface 4211 of the guide ring 421 and abuts against the second positioning surface 4211. The guide ring 421 is mounted on the upper bearing mounting plate 425 through the upper bearing 426. Therefore, the guide ring 421 will generate a reverse force on the test tube clamping block 422, thereby reducing the clamping space of the test tube 2000.

[0050] To better hold the test tube, the test tube positioning mold 423 may optionally include multiple positioning claws 4232 mounted on the positioning base 4231. The multiple positioning claws 4232 are arranged in a ring around the positioning base 4231; and the positioning claws 4232 are spaced apart from the test tube clamping blocks 422; the inner sidewalls of the positioning claws 4232 and the clamping surfaces 4223 together form the clamping space for the test tube 2000. Optionally, there may be 3 or 4 positioning claws 4232 and 422 test tube clamping blocks, or other quantities.

[0051] A polyurethane clamping block 424 is installed on the inner side of the clamping part 4222. The polyurethane clamping block 424 forms the clamping surface 4223. Polyurethane has a certain elasticity. The polyurethane clamping block 424 made of polyurethane material can better clamp the test tube body. That is, it can clamp the test tube body tightly, but it will not cause the test tube body to be squeezed and broken due to excessive clamping.

[0052] In this embodiment, to rotate the test tube body to open and close the cap, the test tube body clamping unit 42 is mounted on the rotating unit 43. The rotating unit 43 drives the test tube body clamping unit 42 and the test tube body to rotate during test tube cap opening and closing and reagent injection. Specifically, the rotating unit 43 includes a servo motor 431 and a dynamic torque sensor 432. The rotating unit 43 is mounted on the lifting unit 45 and can be driven to move up and down by the lifting unit 45. The servo motor 431 and the dynamic torque sensor 432 are connected by a gear set. The gear set includes a first gear 4331 and a second gear 4332. The first gear 4331 is fixedly connected to the servo disk, and the first gear 4331 is fixedly connected to the output shaft of the servo motor 431 through the servo disk. The second gear 4332 meshes with the first gear 4331 for transmission. The dynamic torque sensor 432 is fixedly connected to the second gear 4332 by fasteners such as screws, and the dynamic torque sensor 432 is located above the second gear 4332. The test tube positioning mold 423 is installed on the dynamic torque sensor 432. Therefore, the rotation of the servo motor 431 can drive the test tube 2000 to rotate through the first gear 4331, the second gear 4332, and the test tube positioning mold 423.

[0053] To facilitate a better connection between the test tube positioning mold 423 and the dynamic torque sensor 432, the test tube positioning mold 423 also includes a connecting seat 4233 located below the positioning base 4231. The connecting seat 4233 is connected to the dynamic torque sensor 432 via a dynamic torsion joint. Therefore, when the servo motor 431 drives the first gear 4331 to rotate, it drives the second gear 4332 and the dynamic torque sensor 432 to rotate, thereby causing the test tube positioning mold 423 and the test tube body on it to rotate. During the rotation of the test tube body, the dynamic torque sensor 432 can detect the torque of the test tube positioning mold 423 during rotation and feed it back to the controller, thereby better controlling the torque output of the servo motor 431. Furthermore, when no test tube 2000 is placed on the test tube positioning mold 423, the torque value detected by the dynamic torque sensor 432 changes, thereby controlling the servo motor 431 to stop operating and preventing idling. In this embodiment, during the process of unscrewing the test tube cap, the torque output by the servo motor 431 is a first torque value, which is the torque that ensures the test tube body and the test tube cap are just screwed open. This first torque value was obtained by the inventors through multiple test tube cap opening and closing experiments. During the process of tightening the test tube cap, the torque output by the servo motor 431 is a second torque value, which is the torque that ensures the test tube body and the test tube cap are tightened to a suitable tightness, preventing the test tube cap from being pushed out by steam during high-temperature digestion. Optionally, the second torque value is the torque value that allows the test tube 2000 to maintain a tight seal even when heated to 120 degrees Celsius during high-temperature digestion. This value was obtained by the inventors through research and multiple cap opening and closing experiments and high-temperature digestion experiments.

[0054] In an alternative embodiment, such as Figure 11 and Figure 12As shown, the lifting unit 45 includes a base 451, a guide rail mounting plate 452, a lifting guide rail 453, a slider mounting plate 454, and a lifting motor 455. The base 451 is disposed on the translation unit 44 and is used to mount the lifting motor 455. The guide rail mounting plate 452 is vertically disposed on the translation unit 44, the lifting guide rail 453 is vertically mounted on the guide rail mounting plate 452, and the slider mounting plate 454 is slidably mounted on the lifting guide rail 453. The lifting motor 455 is mounted on the base 451, and its motor shaft is vertically arranged. A first nut 456 is sleeved on the motor shaft of the lifting motor 455. The slider mounting plate 454 is fixedly connected to the motor shaft of the lifting motor 455 through the first nut 456. At the same time, the slider mounting plate 454 is also fixedly connected to the rotating unit 43 or the test tube positioning mold 423. Therefore, the lifting motor 455 can drive the test tube positioning mold 423 of the test tube body clamping unit 42 to move up and down along the direction of the lifting guide rail 453, thereby driving the test tube clamping block 422 to move closer to or away from the guide ring 421, so that the test tube clamping block 422 clamps or releases the test tube body.

[0055] To facilitate the installation of the dynamic torque sensor 432 and to enable the lifting unit 45 to drive the test tube clamping unit 42 to rise and fall, the slider mounting plate 454 includes a vertical mounting plate 4541 and a horizontal connecting plate 4542 connected to each other. The servo motor 431 and the dynamic torque sensor 432 are respectively mounted on the torque sensor mounting base 434; the vertical mounting plate 4541 is slidably mounted on the lifting guide rail 453, and the horizontal connecting plate 4542 is respectively connected to the torque sensor mounting base 434 and the motor shaft of the lifting motor 455; a bearing mounting base 457 is also provided on the horizontal connecting plate 4542, and a lower bearing 458 is provided inside the bearing mounting base 457; the inner ring of the lower bearing 458 is sleeved on the outer wall of the connecting base 4233, and when the test tube clamping unit 42 is driven to rotate by the rotating unit 43, the test tube clamping unit 42 can rotate relative to the horizontal connecting plate 4542.

[0056] In this embodiment, the test tube clamping block 422 clamps the test tube body as follows: the lifting motor 455 drives the test tube positioning mold 423 of the test tube body clamping unit 42 to move upward along the direction of the lifting guide rail 453, causing the test tube clamping block 422 to approach the guide ring 421. Under the reverse pressure of the guide ring 421, the test tube clamping block 422 tightens towards the center to clamp the test tube body. In order to detect whether the test tube body is clamped, a displacement detection unit can be set in the vertical direction to detect whether the test tube clamping block 422 has risen to a preset position. Specifically, as shown in the figure... Figure 13As shown, the displacement detection unit may include a photoelectric switch 4591 and a sensing plate 4592. The photoelectric switch 4591 is mounted on the base plate 443 of the translation unit 44 via a vertical plate, while the sensing plate 4592 is mounted on the horizontal connecting plate 4542. The photoelectric switch 4591 has a sensing area. When the lifting unit 45 moves the test tube clamping unit 42 up and down, it can move the horizontal connecting plate 4542 up and down, thereby causing the sensing plate 4592 to move closer to or further away from the sensing area on the photoelectric switch 4591. When the sensing plate 4592 is located in the sensing area on the photoelectric switch 4591, the photoelectric switch 4591 will detect it and generate a sensing signal, which is transmitted to the controller on the total phosphorus analysis equipment. This allows the lifting unit 45 to stop rising, and at the current moment, the test tube clamping block 422 has risen to the preset position and clamped the test tube.

[0057] like Figure 9 and 10 As shown, in an optional embodiment, the translation unit 44 includes a translation motor 441, a translation guide rail 442, and a base plate 443. The motor shaft of the translation motor 441 and the translation guide rail 442 are horizontally arranged. Specifically, the translation guide rail 442 includes two parallel guide rails. Preferably, the motor shaft of the translation motor 441 can be located between the two parallel guide rails. Alternatively, the motor shaft of the translation motor 441 can also be located outside the two parallel guide rails. The translation motor 441 can be a linear motor. A second nut 444 is fitted on the motor shaft of the translation motor 441, and the base plate 443 is fixedly connected to the second nut 444, thereby fixing the base plate 443 to the motor shaft. At the same time, the base plate 443 is also slidably mounted on the translation guide rail 442 through the slider unit. The translation motor 441 drives the base plate 443 to slide on the translation guide rail 442 through the motor shaft, so as to drive the lifting unit 45, the rotating unit 43, and the test tube body clamping unit 42 on the base plate 443 to move.

[0058] Combination Figure 8 and Figure 15As can be seen, during the process of unscrewing or tightening the test tube cap, the electric gripper 411 at the end of the three-axis manipulator 414 is needed to clamp the test tube cap. The three-axis manipulator 414 is located above the operating platform. In order to facilitate operation, the positional relationship of each device and component needs to be adapted to avoid mutual interference. Therefore, the capping position and the dispensing position of the reagent injection area D are set above the translation guide 442 along the direction of extension of the translation guide 442. In particular, the capping position is set above the corresponding end of the translation guide 442, and the dispensing position is set above the corresponding middle part of the translation guide 442. The dispensing position is located below the dispensing unit. A lifting unit 45 is installed on the base plate 443, a rotating unit 43 is installed on the lifting unit 45, and a test tube clamping unit 42 is installed on the rotating unit 43. Therefore, the translation motor 441 drives the motor shaft to rotate, which can drive the base plate 443 and the lifting unit 45, rotating unit 43 and test tube clamping unit 42 on it to translate along the direction of the guide rail extension, thereby driving the test tube clamping unit 42 and the test tube on it to move between the capping position and the dispensing position. Furthermore, the setting of the translation unit 44 can also enable the dispensing needle 511 to lean against the inner wall of the test tube during dispensing, and the reagent dripped by the dispensing needle 511 can slide down the inner wall of the test tube into the sample solution, thereby making the reagent addition more complete and effective.

[0059] In this embodiment, the reagent injection device 500 includes an infusion assembly (not shown) and a dripping assembly 51. The infusion assembly is used to output the corresponding reagents to the dripping assembly 51 at each stage of the total phosphorus analysis in water. The infusion assembly includes an input tube, a delivery pump, and an output tube connected in sequence. The dripping assembly 51 includes multiple dripping needles 511 arranged in sequence along the moving direction of the translation unit 44. Each dripping needle 511 is connected to a corresponding output tube, and each dripping needle 511 is located above the dripping position for dripping into the test tube. The translation unit 44 drives the rotation unit 43 and the test tube clamping unit 42 to move, moving the test tube from the capping position to the dripping position. The dripping needles 511 descend to a preset height so that the dripping needles 511 rest against the inner wall of the test tube 2000 to drip.

[0060] In this embodiment, as Figure 16As shown, the dispensing assembly 51 includes multiple dispensing needles 511 arranged along the direction of the translation guide 442. The dispensing needles 511 are used to inject corresponding reagents into the test tube body at various stages of total phosphorus analysis. In order to ensure that the reagents are injected more completely into the test tube 2000, when the dispensing assembly 51 dispenses liquid into the test tube 2000, the translation unit 44 drives the rotation unit 43 and the test tube body clamping unit 42 to translate to the dispensing position and position the dispensing needles 511 above the inner wall of the test tube 2000. This allows the dispensing needles 511 to be close to the test tube wall when they descend into the test tube body, so that the reagents on the dispensing needles 511 can flow down the inner wall of the test tube 2000 into the original solution in the test tube 2000. Even if the reagents on the dispensing needles 511 are completely injected into the test tube 2000 along the inner wall of the test tube 2000, it helps to improve the accuracy of total phosphorus analysis and reduce analytical errors.

[0061] To prevent reagent from dripping onto the lower translation guide rail 442, such as Figure 16 As shown, the test tube clamping unit 42 is also provided with an anti-drip block. The anti-drip block includes a test tube sleeve 4271 and a dripping groove 4272 provided along the direction of the translation guide rail 442. The test tube sleeve 4271 can be fitted onto the outer wall of the test tube 2000 to enhance the stability of the test tube 2000 when it rotates. The dripping groove 4272 is used to receive the residual solution dripped from the dripping needle 511.

[0062] Optionally, a waste liquid cleaning tank 52 is also installed on the base plate 443 to clean the dropper assembly 51. The waste liquid cleaning tank 52 is located on one side of the test tube clamping unit 42. When the test tube clamping unit 42 is in the capping position, the waste liquid cleaning tank 52 is located below the dropper assembly 51. At this time, the dropper needle 511 of the dropper assembly 51 can be lowered into the waste liquid cleaning tank 52 to clean the dropper needle 511, so as to prevent various reagents from interfering with each other and causing adverse effects on the accuracy of total phosphorus analysis.

[0063] In this embodiment, as Figures 17 to 21As shown, the sample mixing device 300 for total phosphorus analysis includes: a oscillating motor 31, a drive shaft 32, a driven shaft 33, a first mounting plate 34, a first bearing 342, a test tube holder 36, a second mounting plate 35, and a second bearing 351. The first bearing 342 is mounted on the first mounting plate 34. The drive shaft 32 is sleeved within the first bearing 342. One end of the drive shaft 32 is fixedly connected to the motor shaft of the oscillating motor 31, and the other end is fixedly connected to a side wall of the test tube holder 36. When the oscillating motor 31 operates, the motor shaft drives the drive shaft 32 to rotate within the first bearing 342. The test tube holder 36 is used to hold test tubes 2000. The oscillating motor 31 drives the test tube holder 36 via the drive shaft 32 to shake the test tubes 2000, thereby mixing the sample solution within the test tubes 2000. The second bearing 351 is mounted on the second mounting plate 35. Optionally, both the first mounting plate 34 and the second mounting plate 35 are vertically mounted on the frame 100, and are positioned opposite each other. The driven shaft 33 is coaxially mounted with the drive shaft 32. One end of the driven shaft 33 is fitted into the second bearing 351, and the other end is fixedly connected to the side wall of the test tube holder 36. The test tube holder 36 has a test tube cavity for placing the test tube 2000 along a direction perpendicular to the drive shaft 32. The oscillating motor 31 rotates, driving the test tube holder 36 via the drive shaft 32 to oscillate the test tube 2000 to the left or right around the drive shaft 32, shaking to evenly mix the sample solution within the test tube 2000.

[0064] When mixing the sample solution, to prevent the test tube 2000 from being thrown out, it needs to be fixed. Existing technologies typically use anti-dislodgement components to fix the bottom and cap of the test tube 2000 to prevent it from being thrown out. However, the inventors found that these anti-dislodgement methods are structurally complex, difficult to implement, and costly. Therefore, in this embodiment, a rubber ring 362 is added inside the test tube holder 36 to prevent the test tube 2000 from being thrown out during the sample solution mixing process. Optionally, such as... Figure 18 As shown, an annular mounting groove 361 is provided at the upper part of the test tube cavity within the test tube holder 36, and a rubber ring 362 is provided inside the mounting groove 361. When the test tube 2000 is placed into the test tube cavity, compression occurs between the rubber ring 362, the test tube cavity, and the outer wall of the test tube 2000, thereby fixing the test tube 2000 inside the test tube cavity and preventing it from being thrown out when the test tube 2000 swings.

[0065] Furthermore, to create an adsorption effect within the test tube cavity to prevent the test tube 2000 from being ejected, a vent 363 is provided at the bottom of the test tube cavity, connecting the bottom of the cavity to the outside of the test tube holder 36. When the test tube 2000 is placed into the cavity, the rubber ring 362, the cavity, and the outer wall of the test tube 2000 are compressed, sealing the upper part of the cavity. Air inside the cavity is then expelled through the vent 363. When the test tube 2000 is inserted to the bottom of the cavity, a negative pressure is created between the inner and outer surfaces of the test tube holder 36, adsorbing the test tube 2000. This further prevents the test tube 2000 from being ejected when the sample solution is shaken. Specifically, there are two vent holes 363, which are opened opposite each other on both sides of the bottom of the test tube cavity. The vent holes 363 extend horizontally from the inside of the test tube cavity to the outside of the test tube base 36, so that when the test tube 2000 is placed to the bottom of the test tube cavity, the air in the test tube cavity can be better exhausted, and the test tube 2000 can be further prevented from being thrown out when it swings.

[0066] In this embodiment, the test tube holder 36 can be designed in a cylindrical, square, or other shape. To better accommodate the test tube 2000 and prevent damage from impact, the test tube holder 36 is made of a rigid material, such as metal or hardwood. In this embodiment, the test tube holder 36 is made of aluminum. In a preferred embodiment, to ensure the test tube 2000 is stably and reliably placed in the test tube holder 36, the test tube cavity within the test tube holder 36 can be designed as a cylinder.

[0067] To facilitate the installation and fixation of the test tube holder 36, optional features may be provided, such as... Figure 20 As shown, a first mounting position 365 and a second mounting position 366 are respectively provided on both sides of the test tube holder 36. A first mounting seat 321 is provided at the other end of the drive shaft 32, and the first mounting seat 321 is fixedly connected to one side wall of the test tube holder 36 at the first mounting position 365; a second mounting seat 331 is provided at one end of the driven shaft 33, and the second mounting seat 331 is fixedly connected to the other side wall of the test tube holder 36 at the second mounting position 366. Therefore, the test tube holder 36 can be installed between the first mounting plate 34 and the second mounting plate 35 through the drive shaft 32 and the driven shaft 33, so that the test tube holder 36 can swing around the drive shaft 32 as the axis under the drive of the drive shaft 32.

[0068] During high-temperature digestion of the sample solution, test tubes 2000 may crack, or steam may push the caps off, potentially resulting in empty test tubes 2000. In such cases, the empty test tubes 2000 and related data must be discarded to avoid affecting the accuracy of the overall total phosphorus analysis data. Therefore, a solution detection component is needed to check whether the test tubes 2000 in the test tube holder 36 are empty, or whether the sample solution in the test tubes 2000 has reached the preset value.

[0069] In an alternative embodiment, the solution detection assembly may include an optical sensor 341, which is fixed to the first mounting plate 34; the test tube holder 36 is also provided with an observation hole 364, which communicates with the test tube cavity; the optical sensor 341 detects whether there is liquid in the test tube 2000 through the observation hole 364, thereby determining whether the current test tube 2000 is empty, or determining that the sample solution in the current test tube 2000 has not reached the preset value.

[0070] In an alternative embodiment, the solution detection component may include a capacitive sensor (not shown), which is electrically connected to the controller of the total phosphorus analysis device. The capacitive sensor is installed inside the test tube cavity to detect the presence or content of liquid in the test tube 2000, thereby determining whether the test tube 2000 is currently empty. Simultaneously, after each reagent addition or each high-temperature digestion, the capacitive sensor can also detect whether the solution volume in the test tube 2000 changes. If, after a reagent addition, the change in solution volume in the test tube 2000 does not reach a preset change value or exceeds a preset change value, it indicates that the reagent addition was invalid, and the data related to that test tube 2000 needs to be discarded to avoid affecting the overall accuracy of the total phosphorus analysis.

[0071] In an optional embodiment, the oscillating motor 31 is a servo motor, and the output shaft of the servo motor is connected to the drive shaft 32 via a servo disc 37 and a servo disc adapter block 38. Specifically, the servo disc 37 is fixedly connected to the output shaft of the servo motor, the servo disc adapter block 38 is fixedly connected to the servo disc 37, and the drive shaft 32 is fixedly connected to the servo disc adapter block 38, thereby making the output shaft of the servo motor fixedly connected to the drive shaft 32 via the servo disc 37 and the servo disc adapter block 38.

[0072] To achieve stable installation of the servo motor, such as Figure 17 As shown, the sample mixing device 300 also includes a servo mounting plate 39. The servo mounting plate 39 is Z-shaped and includes a mounting part 391 for fixing the servo and a support part 393 for fixedly connecting with the first mounting plate 34, as well as a connecting part 392 connecting the mounting part 391 and the support part 393. The connecting part 392 is horizontally arranged, and its surface is provided with a clearance groove for avoiding the servo disc 37 and the servo disc adapter block 38. The servo disc 37 and the servo disc adapter block 38 can be locked in the clearance groove, thereby achieving stable installation of the servo disc 37 and the servo disc adapter block 38.

[0073] A servo motor drives the output shaft to rotate, thereby rotating the test tube holder 36 and the test tube 2000. The rotation angle of the test tube holder 36 is the same as the rotation angle of the servo motor's output shaft. Different rotation angles of the test tube 2000 affect the sample mixing effect, which in turn affects the sample digestion effect, ultimately impacting the accuracy of the total phosphorus analysis. To control the rotation angle of the test tube 2000, the rotation angle of the servo motor's output shaft needs to be controlled. Specifically, the rotation angle of the servo motor's output shaft can be controlled by the controller of the total phosphorus analyzer. The rotation angle can be any angle between 60 degrees and 130 degrees. For example, the output shaft rotation angle can be controlled to 60 degrees, 90 degrees, 120 degrees, 130 degrees, or other angle values, i.e., the rotation angle of the test tube 2000 can be controlled to 60 degrees, 90 degrees, 120 degrees, 130 degrees, or other angle values. In a preferred embodiment, the servo motor drives the test tube 2000 to rotate by 120 degrees. When the sample is shaken, the servo motor can be configured to drive the test tube 2000 to rotate 120 degrees to the left around the output shaft as the axis, and then rotate 120 degrees to the right. After rotating a preset number of times, the rotation stops, and the servo motor is controlled to return to its original position so that the test tube 2000 can be clamped by the grippers of the test tube transfer device 200.

[0074] In this embodiment, as Figure 1 and 2 As shown, the sample digestion device 600 is disposed on the sample digestion area B, and includes a heat insulation layer, a heat source, and a heat-conducting block. The heat source and the heat-conducting block are enclosed inside the heat insulation layer. The heat-conducting block is positioned above and in contact with the heat source. The heat-conducting block has several holes matching the test tube body. The test tube 2000 is placed in the holes, and the heat-conducting block transfers the heat source to the test tube 2000 to heat it, thereby achieving high-temperature digestion. In this embodiment, the sample solution in the test tube 2000 is heated to a preset temperature, for example, between 110 and 130 degrees Celsius. Preferably, heating to 120 degrees Celsius yields the best digestion effect. Optionally, the heat-conducting block can be made of aluminum, which has good thermal conductivity. The heat source can be a metal heating rod.

[0075] In this embodiment, the spectrophotometer is used to perform spectrophotometric determination on the sample to be tested in the test tube 2000 after high-temperature digestion to obtain total phosphorus determination data. After obtaining the total phosphorus determination data, the main control device can perform data analysis and generate more intuitive display forms such as charts.

[0076] The following provides a detailed explanation of the steps involved in total phosphorus analysis in water.

[0077] The analysis of total phosphorus in water may include the following steps: S1: adding digesting agent; S2: first shaking; S3: high-temperature digestion; S4: cooling; S5: adding dechlorinating agent; S6: second shaking; S7: settling; S8: adding colorimetric reagent; S9: spectrophotometric determination.

[0078] In an optional embodiment, the above steps may specifically be as follows: the test tube transfer device 200 clamps the test tube 2000 containing the stock solution on the sample storage area A and moves it to the reagent addition area D. At this time, the test tube capping device 400's cap clamping assembly 41 clamps the test tube cap, and the test tube body rotation assembly drives the test tube body to rotate so that the test tube body and the test tube cap are released to open the cap; the translation unit 44 of the test tube body rotation assembly drives the test tube body to the drip position below the reagent injection device 500; the corresponding drip needle 511 of the reagent injection device 500 is controlled to descend to add the digesting agent into the test tube body, and the rotation unit 43 drives the test tube body to rotate during reagent injection; the translation unit 44 drives the test tube body to the capping position, at which time the test tube capping device 400... The test tube cap clamping assembly 41 clamps the test tube cap and lowers it to the opening of the test tube 2000. The rotating unit 43 drives the test tube body to rotate relative to the test tube cap to tighten the test tube cap. When tightening the test tube 2000, the direction of rotation of the test tube body driven by the rotating unit 43 is opposite to the direction of rotation when unscrewing the test tube 2000. After tightening the test tube cap, the test tube transfer device 200 clamps the test tube 2000 and transfers it from the capping position of the reagent addition area D to the sample mixing device 300. After the sample mixing device 300 mixes the reagent and the sample to be tested, the test tube transfer device 200 clamps and transfers the mixed test tube 2000 from the sample mixing device 300 to the sample digestion area B. The test tubes are transferred to the sample digestion area B for high-temperature digestion according to the above steps.

[0079] The sample digestion device 600 digests the sample to be tested in the test tube 2000 into a sample suitable for total phosphorus detection in water quality. The test tube transfer device 200 clamps and moves the digested test tube 2000 from the sample digestion area B to the sample storage area A for cooling. After cooling, a dechlorinating agent needs to be added sequentially. The test tube rotating component clamps the test tube 2000 again and moves it to the capping position to unscrew the cap. The translation unit 44 transfers the capped test tube 2000 from the capping position to the dispensing position. At this time, the reagent injection is controlled. The corresponding dispensing needle 511 of the device 500 descends to add the dechlorinating agent into the test tube body, and the rotating unit 43 drives the test tube body to rotate during reagent injection; after the dechlorinating agent is added, the translation unit 44 transfers the test tube to the capping position to tighten the test tube cap; after tightening the test tube cap again, the test tube transfer device 200 clamps the test tube 2000 from the capping position to the sample mixing device 300 for mixing, and then transfers it to the sample storage area A for standing. The above steps are repeated to transfer each test tube to the sample storage area A for standing.

[0080] After a preset settling time, the test tube transfer device 200 transfers the test tubes to the capping position, reopens the caps, and transfers them to the dispensing position. The reagent injection device 500 adds colorimetric reagent to each test tube 2000 sequentially, and then waits for spectrophotometric determination. Finally, the spectrophotometer sequentially performs total phosphorus detection on the samples in each test tube 2000, obtains the total phosphorus detection data, and transmits it to the main control device for data analysis and processing to finally obtain the total phosphorus analysis data. Compared with the prior art, the total phosphorus analysis device of this embodiment has the following advantages.

[0081] Compared to the traditional manual method of opening and closing test tube caps, this new method uses a cap clamping unit to hold the cap in place. Multiple clamping blocks create a space around the test tubes to hold them in place. A lifting unit then moves the clamping blocks up or down via a positioning mold, creating a squeezing effect between the first and second positioning surfaces. This causes the clamping blocks to pivot inward or outward relative to the positioning base, increasing or decreasing the clamping space and thus tightening or loosening the test tubes. This, in turn, causes the test tubes to rotate relative to the cap, allowing the cap to be unscrewed or tightened. This eliminates the need for manual cap opening and tightening, improving efficiency and contributing to higher total phosphorus analysis efficiency. Furthermore, the appropriate torque setting ensures a tight seal, preventing the caps from being ejected by steam during high-temperature digestion and ensuring smooth opening when needed.

[0082] Compared to the traditional method of manually opening and closing test tube caps and adding reagents with a handheld reagent needle, this automated method uses a cap clamping unit to hold the test tube cap, and a body clamping unit to hold the test tube body. A rotating unit then rotates the body clamping unit, causing the test tube body to rotate relative to the cap, thus opening or tightening the test tube. This automated cap-opening and closing method improves efficiency and contributes to higher total phosphorus analysis efficiency. After the cap is opened, a translation unit moves the test tube body from the capping position to the dispensing position, placing it below the dispensing assembly. The rotating unit then rotates the test tube body as the dispensing assembly dispenses the reagent, allowing the test tube body to rotate relative to the dispensing needle. This reduces reagent residue on the dispensing needle, prevents reagent adhesion, and ensures more effective and complete reagent injection, ultimately improving the efficiency and accuracy of total phosphorus analysis in water. Furthermore, when the test tube body is moved to the dispensing position by the translation unit, the dispensing needle of the reagent injection device is positioned directly above the inner wall of the test tube body. When the dispensing needle dispenses liquid onto the inner wall of the test tube, it can rest against the inner wall of the test tube. The rotating unit rotates the test tube body during each reagent injection stage, so as to add reagent while rotating the test tube body, reduce reagent residue on the reagent needle, and achieve complete reagent addition, which helps to improve the accuracy of total phosphorus analysis.

[0083] Compared to the traditional method of manually shaking test tubes to mix the sample solution, this embodiment mounts the test tube holder between the first and second mounting plates via a first and a second bearing. The test tube holder is fixedly connected to the motor shaft of the oscillating motor via a drive shaft, allowing the oscillating motor to directly drive the test tube holder to rotate in both left and right directions, thereby mixing the sample inside the test tube. This method avoids mixing errors caused by manual operation, thus improving the efficiency and accuracy of total phosphorus analysis in water quality. Furthermore, compared to the method of moving the test tube back and forth, this embodiment uses a shaking method with the output shaft of the oscillating motor as the axis and a preset angle to shake the test tube, resulting in a better mixing effect and a shorter shaking time per test tube, further improving the efficiency of total phosphorus analysis.

[0084] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A water quality total phosphorus analysis device, characterized in that, include: The frame, and the test tube transfer device, test tube capping device, reagent injection device, sample mixing device, sample digestion device and spectrophotometer set on the frame; The rack is equipped with an operating platform, which includes a sample storage area, a sample digestion area, a sample mixing area, and a reagent addition area. The test tube transfer device is used to move the test tube between the sample storage area, the sample digestion area, the sample mixing area, and the reagent addition area; The test tube capping device is used to unscrew or tighten the test tube cap, and includes: a test tube cap clamping assembly and a test tube body rotating assembly; the test tube cap clamping assembly is installed at the cantilever end of the test tube transfer device and is used to clamp the test tube cap; the test tube body rotating assembly is installed in the reagent adding area and is used to clamp and rotate the test tube body so that the test tube body is loosened or tightened from the test tube cap. The reagent injection device is used to inject the corresponding reagents into the test tube containing the sample to be tested at each stage of the total phosphorus analysis of water quality. The sample mixing device is used to mix the reagent with the sample to be tested after the reagent is injected. The sample digestion device is used to digest the sample to be tested in the test tube into a sample that can be used for total phosphorus detection in water quality. The spectrophotometer is used to detect total phosphorus in the sample to be tested after digestion by the sample digestion device. The test tube body rotation assembly includes a translation unit, a rotation unit, a lifting unit, and a test tube body clamping unit; the test tube body clamping unit is mounted on the rotation unit; The translation unit drives the rotation unit and the test tube clamping unit to move, thereby moving the test tube body within the reagent addition area so that the test tube body is positioned below the reagent injection device and the dispensing needle of the reagent injection device is positioned above the inner wall of the test tube body. When the dropper of the reagent injection device drips liquid onto the inner wall of the test tube, the dropper rests against the inner wall of the test tube, and the test tube body is rotated by the rotating unit. The lifting unit is mounted on the translation unit, and the rotating unit is mounted on the lifting unit; The test tube clamping unit includes an upper bearing mounting plate, an upper bearing, a guide ring, a test tube positioning mold, and multiple test tube clamping blocks; The upper bearing is mounted on the upper bearing mounting plate, and the inner ring of the upper bearing is sleeved on the outer side wall of the guide ring; The test tube positioning mold includes a positioning base, which is mounted on the rotating unit; The test tube clamping block includes a clamping seat and a clamping part mounted on the clamping seat. The clamping seat is arranged in a ring shape and pivotally mounted on the positioning base. The clamping part includes an inner clamping surface and an outer first positioning surface. Multiple clamping surfaces are arranged to form a ring-shaped test tube clamping space. The inner wall of the guide ring includes a second positioning surface. The clamping part extends into the inner side of the guide ring. When the lifting unit drives the test tube clamping block to rise or fall through the test tube positioning mold, a squeezing action is generated between the first positioning surface and the second positioning surface, causing the test tube clamping block to pivot inward or outward relative to the positioning base, thereby causing the test tube clamping space formed by the multiple clamping surfaces to become smaller or larger, so as to clamp or release the test tube. The second positioning surface is located below the inner wall of the guide ring and forms an inclined surface that slopes outward; the first positioning surface is an inclined surface corresponding to the second positioning surface, and the clamping part extends into the inner side of the guide ring from below.

2. The water quality total phosphorus analysis equipment according to claim 1, characterized in that, The test tube positioning mold also includes multiple positioning claws installed on the positioning base; Multiple positioning claws are installed in a ring around the positioning base; and the multiple positioning claws and multiple test tube clamping blocks are spaced apart, with the inner sidewalls of the positioning claws and the clamping surfaces together forming a test tube clamping space.

3. The water quality total phosphorus analysis equipment according to claim 1, characterized in that, The rotating unit includes a servo motor and a dynamic torque sensor, which are connected by a gear set. The test tube positioning mold is installed above the dynamic torque sensor. The test tube positioning mold also includes a connecting seat located below the positioning base. The connecting seat is connected to the dynamic torque sensor via a dynamic torsion joint.

4. The water quality total phosphorus analysis equipment according to claim 1, characterized in that, The test tube transfer device includes a three-axis manipulator; The test tube cap clamping assembly includes an electric gripper; the electric gripper is mounted on the end of the three-axis manipulator, and the electric gripper is provided with two opposing test tube cap clamping pieces, the ends of the two test tube cap clamping pieces are arranged opposite each other and are respectively semi-circular to form a test tube cap clamping space. After the two test tube cap clamps hold the test tube caps, the triaxial robot moves the test tube cap clamps and the clamped test tubes to a preset height, and moves the test tubes between the sample storage area, the sample digestion area, the sample mixing area and the reagent addition area.

5. The water quality total phosphorus analysis equipment according to claim 1, characterized in that, The reagent addition area includes a screw cap position and a drop position; The reagent injection device includes an infusion assembly and a dripping assembly; the infusion assembly is used to output the corresponding reagents to the dripping assembly at each stage of the total phosphorus analysis in water quality; the infusion assembly includes an input tube, a delivery pump, and an output tube connected in sequence. The dripping assembly includes a plurality of dripping needles arranged sequentially along the moving direction of the translation unit; each dripping needle is connected to a corresponding output tube, and each dripping needle is located above the dripping position for dripping liquid into the test tube body; The translation unit drives the rotation unit and the test tube body clamping unit to move, moving the test tube body from the capping position to the dripping position; The dispensing needle is lowered to a preset height so that it rests against the inner wall of the test tube to dispense liquid.

6. The water quality total phosphorus analysis equipment according to claim 1, characterized in that, The sample mixing device includes a swing motor, a drive shaft, a driven shaft, a first mounting plate, a first bearing, a test tube holder, a second mounting plate, and a second bearing; The first bearing is mounted on the first mounting plate, the drive shaft is sleeved inside the first bearing, one end of the drive shaft is fixedly connected to the motor shaft of the swing motor, and the other end of the drive shaft is fixedly connected to one side wall of the test tube seat. The second bearing is mounted on the second mounting plate. The driven shaft is coaxially arranged with the driving shaft. One end of the driven shaft is sleeved in the second bearing, and the other end of the driven shaft is fixedly connected to the other side wall of the test tube seat. The test tube holder is provided with a test tube cavity for placing test tubes in a direction perpendicular to the drive shaft.

7. The water quality total phosphorus analysis equipment according to claim 6, characterized in that, The inner wall of the test tube cavity is provided with an annular mounting groove, and a rubber ring is provided in the mounting groove; The bottom of the test tube cavity is provided with an exhaust hole, which connects the bottom of the test tube cavity and the outside of the test tube holder; When the test tube is placed in the test tube holder, the rubber ring seals the upper part of the test tube holder, and the air inside the test tube holder is discharged from the vent hole as the test tube body descends, so that a negative pressure is formed between the inner cavity and the outside of the test tube holder to adsorb the test tube.

Images