Total phosphorus and total nitrogen tester and use method thereof

Abstract

The invention discloses a total phosphorus and total nitrogen tester, comprising: a frame provided with a placement area; the pressure device comprises a pressure tank, a cover body, a cover turning mechanism and a locking mechanism, the pressure tank is arranged on the rack, the cover turning mechanism is arranged on the rack, the cover turning mechanism comprises a rotating frame and a cover turning motor, the cover body is rotatably arranged on the rotating frame, and the cover turning motor is in transmission connection with the rotating frame; the locking mechanism is arranged on the rotating frame, the locking mechanism comprises a locking motor, and the locking motor is in transmission connection with the cover body; the liquid taking mechanism at least comprises a liquid taking needle and an injection pump, and the injection pump is arranged on the rack; the liquid taking needle is arranged on the rack, the moving mechanism is arranged on the rack, the liquid taking needle is arranged on the moving mechanism, and a rotating gripper is further arranged on the moving mechanism. The device can be used for automatically treating a water sample and detecting total phosphorus and total nitrogen.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a total phosphorus and total nitrogen measuring instrument and a use method thereof. Background Art

[0002] Eutrophication of water bodies is a phenomenon of water aging. Large amounts of nitrogen and phosphorus discharge will cause eutrophication of water bodies. Therefore, my country uses total nitrogen and total phosphorus as important assessment indicators for evaluating the treatment effect of sewage treatment plants. Total nitrogen (TN): Nitrogen compounds in sewage are divided into organic nitrogen, ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. The total amount of the four nitrogen compounds is called total nitrogen (TN). Kjeldahl nitrogen (TKN) is the sum of organic nitrogen and ammonia nitrogen. Total phosphorus is the result of the determination of various forms of phosphorus in the water sample after digestion, which is converted into orthophosphate. It is measured in milligrams of phosphorus per liter of water sample, and is the sum of phosphorus in inorganic form (inorganic phosphorus) and organic form (organic phosphorus). When determining the total phosphorus in water, potassium persulfate is needed to digest the sample, and the digestion process needs to be carried out under high temperature and high pressure. When determining the total nitrogen in water, potassium persulfate can decompose to produce potassium hydrogen sulfate and atomic oxygen in an aqueous solution above 120°C. Potassium hydrogen sulfate dissociates in the solution to produce hydrogen ions, so the decomposition process can be completed in the alkaline medium of sodium hydroxide. Under certain conditions, the decomposed atomic oxygen can convert the nitrogen element in the water sample containing the nitrogen compound into nitrate. When large-scale water quality testing is required, manual processing of water samples and testing is labor-intensive for operators and affects the detection efficiency. Therefore, a total phosphorus and total nitrogen tester is needed that can automatically process and test water samples. Summary of the invention

[0003] The invention provides a total phosphorus and total nitrogen measuring instrument and a use method thereof, which can automatically process water samples and detect total phosphorus and total nitrogen.

[0004] In order to solve the above technical problems, the present invention provides a total phosphorus and total nitrogen measuring instrument, comprising:

[0005] The rack is provided with a placement area, wherein the placement area is used to place water samples and reagents;

[0006] The pressure device comprises a pressure tank, a cover body, a flip mechanism and a locking mechanism, wherein the pressure tank is arranged on the frame, the flip mechanism is arranged on the frame, the flip mechanism comprises a rotating frame and a flip motor, the cover body is rotatably arranged on the rotating frame, the flip motor is transmission-connected with the rotating frame, and the flip motor can drive the cover body to flip to a first position and a second position; the locking mechanism is arranged on the rotating frame, the locking mechanism comprises a locking motor, the locking motor is transmission-connected with the cover body, and the locking motor can drive the cover body to rotate to a second position and a third position, and when the cover body is in the third position, the cover body and the pressure tank are sealed and connected.

[0007] The liquid collection mechanism at least comprises a liquid collection needle and a syringe pump, wherein the liquid collection needle is connected to the syringe pump, the syringe pump is arranged on the frame, and the position of the liquid collection needle corresponds to the position of the placement area;

[0008] A moving mechanism, wherein the moving mechanism is arranged on the frame, the liquid collection needle is arranged on the moving mechanism, the moving mechanism is used to drive the liquid collection needle to move, a rotating gripper is also arranged on the moving mechanism, and a fixed gripper is also arranged on the frame, and the position of the fixed gripper corresponds to the position of the rotating gripper.

[0009] As a preferred embodiment of the above technical solution, the placement area is provided with a tray, the tray is used to place water sample bottles, the water sample bottles are provided with bottle caps, the position of the rotating gripper corresponds to the position of the bottle cap, the rotating gripper is used to twist the bottle cap, and a number of reagent bottles are also provided on the placement area.

[0010] As a preferred embodiment of the above technical solution, the opening of the pressure tank extends outward to form a plurality of first locking portions, and the opening of the cover body extends inward to form a plurality of second locking portions, and when the cover body is in the third position, the lower portion of the first locking portion abuts against the upper portion of the second locking portion.

[0011] As a preferred embodiment of the above technical solution, a pressure sensor and a temperature sensor are provided in the pressure tank, and an exhaust valve is also provided at the pressure sensor.

[0012] As a preferred embodiment of the above technical solution, an electric heating tube is provided inside the pressure tank, and the electric heating tube is located at the lower part of the pressure tank. A water level sensor is provided inside the pressure tank, and the position of the water level sensor corresponds to the position of the electric heating tube. The pressure tank is also provided with a water inlet pipe, and the water inlet pipe passes through the pressure tank and extends into the interior of the pressure tank. A water inlet valve is also provided on the water inlet pipe, and the water inlet valve is provided outside the pressure tank.

[0013] As a preferred embodiment of the above technical solution, the locking mechanism includes a locking gear, a locking rack is provided on the cover body, the locking gear is meshed with the locking rack, and the locking motor is transmission-connected with the locking gear.

[0014] As a preferred embodiment of the above technical solution, a protective plate is provided on the frame, and the position of the protective plate corresponds to the position of the pressure device.

[0015] As a preferred embodiment of the above technical solution, the liquid collection mechanism also includes a multi-way rotary valve and a water pump. When the multi-way rotary valve is in a first position, the liquid collection needle is connected to the injection pump. When the multi-way rotary valve is in a second position, the liquid collection needle is connected to the water pump. The water pump is used to connect to a water tank.

[0016] As a preferred embodiment of the above technical solution, the liquid collection mechanism further includes a cleaning tank, the position of the cleaning tank corresponds to the position of the liquid collection needle, and a drain port is provided at the bottom of the cleaning tank.

[0017] As a preferred embodiment of the above technical solution, the moving mechanism includes an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, the X-axis moving mechanism includes an X-axis moving guide rail and an X-axis driving device, the Y-axis moving mechanism is installed on the X-axis moving guide rail, and the X-axis driving device drives the Y-axis moving mechanism to slide on the X-axis moving guide rail, the Y-axis moving mechanism includes a Y-axis moving guide rail and a Y-axis driving device, the Z-axis moving mechanism includes a Z-axis guide block, a first Z-axis driving device and a second Z-axis driving device, the Z-axis guide block and the Z-axis guide block are installed on the Y-axis moving guide rail, the Y-axis driving device drives the Z-axis moving mechanism to slide on the Y-axis moving guide rail, the liquid collection needle is installed on the Z-axis guide block, the first Z-axis driving device drives the liquid collection needle to slide on the Z-axis guide block, the rotating gripper is installed on the Z-axis guide block, and the second Z-axis driving device drives the rotating gripper to slide on the Z-axis guide block.

[0018] The present invention also provides a method for using the total phosphorus and total nitrogen measuring instrument, comprising:

[0019] Step S1: placing the water sample bottle containing the water sample on the placement area, and placing the reagent bottle containing the relevant reagent on the placement area;

[0020] Step S2: the moving mechanism drives the rotating gripper to grab the water sample bottle with a cover to the fixed gripper position, the fixed gripper clamps the water sample bottle, the rotating gripper unscrews the bottle cap, and after unscrewing, the rotating gripper drives the bottle cap to move away;

[0021] Step S3: the liquid collection needle on the moving mechanism moves to the reagent bottle, absorbs the reagent and drips it into the water sample bottle;

[0022] Step S4: the rotating gripper transfers the water sample bottle cap to the top of the water sample bottle again, the rotating gripper grabs the bottle cap and tightens the water sample bottle, and then the rotating gripper grabs the water sample bottle and puts it into the pressure tank;

[0023] Step S5: After all the water sample bottles are placed in the pressure tank, the cover flip motor drives the rotating frame to rotate, thereby driving the cover body to flip from the first position to the second position, and then the locking motor drives the cover body to rotate from the second position to the third position;

[0024] Step S6: the pressure device is started to keep the water sample bottle in a high temperature and high pressure state for a certain period of time to allow the water sample and the reagent to react;

[0025] Step S7: After the reaction is completed, the pressure device is cooled down to make the interior of the pressure device at normal pressure, the locking motor drives the cover body to rotate from the third position to the second position, and then the flip motor drives the cover body to flip from the second position to the first position;

[0026] Step S8: the moving mechanism drives the rotating gripper to grab the water sample bottle in the pressure tank and place it in the placement area, and then the rotating gripper unscrews the bottle cap;

[0027] Step S9: the moving mechanism drives the liquid collection needle to move to the reagent bottle, absorbs the reagent and drips it into the water sample bottle to further process the water sample;

[0028] Step S10: After the water sample is processed, the moving mechanism drives the liquid collection needle to move to the water sample bottle, extracts water samples from the water sample bottle, and injects them into an external detection device such as a spectrophotometer for detection.

[0029] The present invention provides a total phosphorus and total nitrogen measuring instrument, comprising: a frame, a pressure device, a liquid taking mechanism and a moving mechanism. By arranging the flip cover mechanism, the locking mechanism, the liquid taking mechanism and the moving mechanism, the degree of automation in the water quality detection process can be improved; the total phosphorus and total nitrogen measuring instrument can automatically process and detect water samples, reduce the labor intensity of operators, and improve detection efficiency.

[0030] The present invention also provides a method for using a total phosphorus and total nitrogen analyzer, comprising: first placing a covered water sample bottle containing a water sample and a reagent bottle containing relevant reagents in the placement area, the mobile mechanism drives the rotating gripper to grab the covered water sample bottle to the fixed gripper position, the fixed gripper clamps the water sample bottle, the rotating gripper unscrews the water sample cover, and after unscrewing, the rotating gripper with cover is removed, the liquid collection needle on the mobile mechanism moves to the reagent bottle, absorbs the reagent and drips it into the water sample bottle, the rotating gripper transfers the water sample bottle cover to the top of the water sample bottle again, the rotating gripper grabs the bottle cover and tightly covers the water sample bottle, and then grabs The water sample bottle is placed in the pressure tank. After all the water samples are placed in the pressure tank, the flip motor drives the rotating frame to rotate, thereby driving the cover body to flip from the first position to the second position, and then the locking motor drives the cover body to rotate from the second position to the third position, completing the connection between the cover body and the pressure tank, and a sealing ring is provided at the opening of the cover body, which is used to seal the joint between the cover body and the pressure tank; when opening the cover, the locking motor drives the cover body to rotate from the third position to the second position, and then the flip motor drives the cover body to flip from the second position to the first position. The moving mechanism drives the rotating gripper to grab the water sample bottle in the pressure tank and place it in the placement area, and then the rotating gripper opens the bottle cap, and the moving mechanism drives the liquid collection needle to move to the reagent bottle, absorbs the reagent and drips it into the water sample bottle to further process the water sample; after the water sample processing is completed, the moving mechanism drives the liquid collection needle to move to the water sample bottle, extracts the water sample from the water sample bottle, and injects it into an external spectrophotometer or other detection equipment for detection; the total phosphorus and total nitrogen analyzer can automatically process and detect water samples, reduce the labor intensity of operators, and improve detection efficiency.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0035] Figure 4This is a schematic diagram of the three-dimensional structure of a pressure device of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the three-dimensional structure of a pressure device of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the three-dimensional structure of a pressure device of a total phosphorus and total nitrogen measuring instrument in an embodiment of the present invention;

[0038] In the figure: 1, frame; 2, pressure device; 3, flip cover mechanism; 4, locking mechanism; 5, liquid taking mechanism; 6, moving mechanism; 101, placement area; 102, tray; 103, protective plate; 104, fixed gripper; 201, pressure tank; 202, cover body; 203, first locking part; 204, second locking part; 205, pressure sensor; 206, temperature sensor; 207, exhaust valve; 208, electric heating tube; 209, water level sensor; 210, water inlet pipe; 211, water inlet valve; 212, locking rack; 301, rotating frame; 302, flip Cover motor; 401, locking motor; 402, locking gear; 501, liquid collection needle; 502, injection pump; 503, multi-way rotary valve; 504, cleaning tank; 505, drain outlet; 601, rotary gripper; 602, X-axis moving mechanism; 603, X-axis moving guide rail; 604, X-axis driving device; 605, Y-axis moving mechanism; 606, Y-axis moving guide rail; 607, Y-axis driving device; 608, Z-axis moving mechanism; 609, Z-axis guide block; 610, first Z-axis driving device; 611, second Z-axis driving device; 612, laser transmitter. DETAILED DESCRIPTION

[0039] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] See also Figures 1 to 6 The embodiment of the present invention provides a total phosphorus and total nitrogen measuring instrument, comprising:

[0042] The rack 1 is provided with a placement area 101, wherein the placement area 101 is used to place water sample bottles and reagent bottles, and the water sample bottles are provided with bottle caps;

[0043] The pressure device 2 comprises a pressure tank 201, a cover body 202, a flip mechanism 3 and a locking mechanism 4. The pressure tank 201 is arranged on the frame 1, and the flip mechanism 3 is arranged on the frame 1. The flip mechanism 3 comprises a rotating frame 301 and a flip motor 302. The cover body 202 is rotatably arranged on the rotating frame 301. The flip motor 302 is transmission-connected with the rotating frame 301, and the flip motor 302 can drive the cover body 202 to flip to a first position and a second position; the locking mechanism 4 is arranged on the rotating frame 301, and the locking mechanism 4 comprises a locking motor 401. The locking motor 401 is transmission-connected with the cover body 202, and the locking motor 401 can drive the cover body 202 to rotate to a second position and a third position. When the cover body 202 is in the third position, the cover body 202 and the pressure tank 201 are sealed and connected.

[0044] The liquid collection mechanism 5 at least comprises a liquid collection needle 501 and a syringe pump 502, wherein the liquid collection needle 501 is connected to the syringe pump 502, and the syringe pump 502 is arranged on the frame 1, and the position of the liquid collection needle 501 corresponds to the position of the placement area 101;

[0045] The moving mechanism 6 is arranged on the frame 1 , and the liquid collection needle 501 is arranged on the moving mechanism 6 . The moving mechanism 6 is used to drive the liquid collection needle 501 to move. The moving mechanism 6 is also provided with a rotating gripper 601 .

[0046] The embodiment of the present invention provides a total phosphorus and total nitrogen analyzer, comprising: a frame 1, a pressure device 2, a liquid collection mechanism 5 and a moving mechanism 6. By arranging the flip mechanism 3, the locking mechanism 4, the liquid collection mechanism 5 and the moving mechanism 6, the degree of automation in the water quality detection process can be improved; the total phosphorus and total nitrogen analyzer can automatically process and detect water samples, reduce the labor intensity of operators, and improve detection efficiency.

[0047] In a further implementable embodiment of the present embodiment, the placement area 101 is provided with a tray 102, and the tray 102 is used to place water sample bottles, and the water sample bottles are provided with bottle caps. The position of the rotating gripper 601 corresponds to the position of the bottle cap, and the rotating gripper 601 is used to twist the bottle cap. A number of reagent bottles are also provided on the placement area 101.

[0048] In this embodiment, the water sample bottle is provided with a bottle cap. When the water sample bottle is placed in the pressure device 2, the water sample bottle is in a high temperature and high pressure environment, which can prevent the water sample from evaporating and affecting the detection result. When in use, the moving mechanism 6 drives the rotating gripper 601 to move, and the bottle cap is tightened and loosened by the rotating gripper 601, without manual operation, thereby improving the convenience of operation.

[0049] In a further embodiment of the present invention, the opening of the pressure tank 201 extends outward to form a plurality of first locking portions 203, and the opening of the cover 202 extends inward to form a plurality of second locking portions 204. When the cover 202 is in the third position, the lower portion of the first locking portion abuts against the upper portion of the second locking portion 204. When the cover 202 is in the second position, the lower portion of the first locking portion and the upper portion of the second locking portion 204 are staggered.

[0050] In this embodiment, the opening of the pressure tank 201 extends outward to form a plurality of first locking portions 203, and the plurality of first locking portions 203 are evenly distributed along the circumference of the opening of the pressure tank 201. The opening of the cover body 202 extends inward to form a plurality of second locking portions 204, and the plurality of second locking portions 204 are evenly distributed along the circumference of the opening of the cover body 202. The positions of the second locking portions 204 and the first locking portions 203 correspond to each other. By providing a plurality of the first locking portions 203 and the second locking portions 204, the connection strength between the cover body 202 and the pressure tank 201 can be effectively strengthened, thereby avoiding safety hazards during use or air leakage of the pressure tank 201.

[0051] In a further implementable embodiment of the present invention, a pressure sensor 205 and a temperature sensor 206 are provided in the pressure tank 201 , and an exhaust valve 207 is also provided at the pressure sensor 205 .

[0052] In this embodiment, a pressure sensor 205 and a temperature sensor 206 are provided in the pressure tank 201 for detecting the pressure and temperature in the pressure tank 201 to ensure the accuracy of the detection result. An exhaust valve 207 is also provided at the pressure sensor 205. When the pressure in the pressure tank 201 is too high, the exhaust valve 207 starts to exhaust and reduce the pressure in the pressure tank 201 to avoid safety hazards. When the sample is processed, the exhaust valve 207 starts to exhaust and reduce the pressure in the pressure tank 201 to facilitate the subsequent opening of the cover 202.

[0053] In a further implementable embodiment of the present embodiment, an electric heating tube 208 is provided inside the pressure tank 201, and the electric heating tube 208 is located at the bottom of the pressure tank 201. A water level sensor 209 is provided inside the pressure tank 201, and the position of the water level sensor 209 corresponds to the position of the electric heating tube 208. A water inlet pipe 210 is also provided on the pressure tank 201, and the water inlet pipe 210 passes through the pressure tank 201 and extends into the interior of the pressure tank 201. A water inlet valve 211 is also provided on the water inlet pipe 210, and the water inlet valve 211 is arranged on the outside of the pressure tank 201.

[0054] In this embodiment, the pressure tank 201 is provided with an electric heating tube 208, and the pressure device 2 heats the pressure tank 201 through the electric heating tube 208, which is convenient for controlling the temperature in the pressure tank 201, and can improve the automation degree of the pressure tank 201 and improve the convenience of operation. The pressure tank 201 is provided with a water level sensor 209, and the pressure tank 201 is also provided with a water inlet pipe 210. The water level sensor 209 is a float switch. Through the cooperation of the water level sensor 209, the water inlet pipe 210 and the water inlet valve 211, it can be ensured that the water level in the pressure tank 201 is higher than the height of the electric heating tube 208, so that the electric heating tube 208 can increase the temperature and air pressure in the pressure tank 201 by heating water, and ensure the accuracy of the detection result.

[0055] In a further implementable embodiment of this embodiment, the locking mechanism 4 includes a locking gear 402 , a locking rack 212 is provided on the outer periphery of the cover body 202 , the locking gear 402 is meshed with the locking rack 212 , and the locking motor 401 is transmission-connected with the locking gear 402 .

[0056] In this embodiment, the locking mechanism 4 includes a locking gear 402, and a locking rack 212 is provided on the cover body 202. The locking motor 401 drives the locking gear 402 to rotate, and the locking gear 402 is engaged with the locking rack 212 on the cover body 202, thereby driving the cover body 202 to rotate compared to the rotating frame 301. The gear rack transmission has the advantage of high transmission accuracy. Through the cooperation of the locking gear 402 and the locking rack 212, the accuracy of the locking motor 401 driving the cover body 202 to rotate can be improved, ensuring that the cover body 202 is rotated into place (so that the cover body 202 switches between the second position and the third position), thereby improving the safety performance of the pressure device 2.

[0057] In a further implementable embodiment of the present invention, a protection plate 103 is provided on the frame 1 , and the position of the protection plate 103 corresponds to the position of the pressure device 2 .

[0058] In this embodiment, a protective plate 103 is provided on the side of the frame 1, and the protective plate 103 is arranged at a position close to the pressure device 2. When the pressure device 2 has a fault such as leakage, the protective plate 103 can play a protective role to prevent the high-temperature and high-pressure gas leaked from the pressure device 2 from causing harm to the operator, thereby improving safety performance.

[0059] In a further implementable embodiment of the present embodiment, the liquid collection mechanism 5 also includes a multi-way rotary valve 503 and a water pump. When the multi-way rotary valve 503 is in a first position, the liquid collection needle 501 is connected to the injection pump 502. When the multi-way rotary valve 503 is in a second position, the liquid collection needle 501 is connected to the water pump. The water pump is used to connect to a water tank.

[0060] In this embodiment, the liquid collection mechanism 5 also includes a multi-way rotary valve 503 and a water pump. When in use, the liquid collection needle 501 is first connected to the water pump, and the water pump draws water and discharges it from the liquid collection needle 501, so as to clean the liquid collection needle 501. Then, the liquid collection needle 501 is connected to the injection pump 502, and the injection pump 502 is connected to the liquid collection needle 501 to absorb a section of air column and airgap. Then, the moving mechanism 6 drives the liquid collection needle 501 to move to a test tube with a reagent to absorb the reagent. After absorbing the reagent, the liquid collection needle 501 is moved to the water sample bottle, and the reagent is injected into the water sample to be tested. The water pump draws water to clean the liquid collection needle 501. By setting the multi-way rotary valve 503 and the water pump in cooperation, the liquid collection needle 501 can be quickly cleaned, thereby improving work efficiency.

[0061] In a further implementable embodiment of the present invention, the liquid collection mechanism 5 further includes a cleaning tank 504 . The position of the cleaning tank 504 corresponds to the position of the liquid collection needle 501 . A drainage port 505 is disposed at the bottom of the cleaning tank 504 .

[0062] In this embodiment, when cleaning the liquid sampling needle 501, the water pump draws water and discharges it from the liquid sampling needle 501 to the cleaning tank 504, which can prevent the residue on the liquid sampling needle 501 from affecting the detection result. The bottom of the cleaning tank 504 is provided with a drain port 505, and the water after cleaning the sampling needle can be discharged through the drain port 505, thereby improving the convenience of operation.

[0063] In a further embodiment of the present embodiment, the moving mechanism 6 includes an X-axis moving mechanism 602, a Y-axis moving mechanism 605 and a Z-axis moving mechanism 608, wherein the X-axis moving mechanism 602 includes an X-axis moving guide rail 603 and an X-axis driving device 604, the Y-axis moving mechanism 605 is installed on the X-axis moving guide rail 603, the X-axis driving device 604 drives the Y-axis moving mechanism 605 to slide on the X-axis moving guide rail 603, the Y-axis moving mechanism 605 includes a Y-axis moving guide rail 606 and a Y-axis driving device 607, and the Z-axis moving mechanism 608 includes a Z-axis guide block 609, a first The Z-axis driving device 610 and the second Z-axis driving device 611, the Z-axis moving mechanism 608 is installed on the Y-axis moving guide rail 606, the Y-axis driving device 607 drives the Z-axis moving mechanism 608 to slide on the Y-axis moving guide rail 606, the liquid collection needle 501 is installed on the Z-axis guide block 609, the first Z-axis driving device 610 drives the liquid collection needle 501 to slide on the Z-axis guide block 609, the rotating gripper 601 is installed on the Z-axis guide block 609, and the second Z-axis driving device 611 drives the rotating gripper 601 to slide on the Z-axis guide block 609.

[0064] In this embodiment, an X-axis moving mechanism 602, a Y-axis moving mechanism 605 and a Z-axis moving mechanism 608 are provided to drive the liquid sampling needle 501 and the rotating gripper 601 to move. The structure is simple and reliable, and is convenient for automatic control. The X-axis moving mechanism 602 and the Y-axis moving mechanism 605 are used to move the sampling needle above the placement area 101 or above the pressure device 2 or the cleaning tank 504, and the Z-axis moving mechanism 608 is used to drive the sampling needle and the rotating gripper 601 to move up and down. The X-axis driving device 604 is an electric actuator, and the X-axis driving device 604 is used to drive the Y-axis moving mechanism 605 to slide on the X-axis moving guide rail 603. The Y-axis driving device 607 is a driving motor, and the Y-axis driving device 607 is connected to the Z-axis guide block 609 through a synchronous belt. The Y-axis driving device 607 drives the Z-axis moving mechanism 608 to slide on the Y-axis moving guide rail 606. The first Z-axis driving device 610 is connected to the liquid collection needle 501 through a belt drive, and the second Z-axis driving device 611 is connected to the rotating gripper 601 through a belt drive.

[0065] The embodiment of the present invention also provides a method for using a total phosphorus and total nitrogen measuring instrument, comprising:

[0066] Step S1: placing the water sample bottle containing the water sample on the placement area 101, and placing the reagent bottle containing the relevant reagent on the placement area 101;

[0067] Step S2: the moving mechanism 6 drives the rotating gripper 601 to grab the water sample bottle with a cap to the position of the fixed gripper 104, the fixed gripper 104 clamps the water sample bottle, and the rotating gripper 601 unscrews the bottle cap. After unscrewing, the rotating gripper 601 drives the bottle cap to move away;

[0068] Step S3: the liquid collection needle 501 on the moving mechanism 6 moves to the reagent bottle, absorbs the reagent and drips it into the water sample bottle;

[0069] Step S4: the rotating gripper 601 transfers the water sample bottle cap to the top of the water sample bottle again, the rotating gripper 601 grabs the bottle cap and tightens the water sample bottle, then the rotating gripper 601 grabs the water sample bottle and puts it into the pressure tank 201, and then cleans the liquid collection needle 501;

[0070] Step S5: After all the water sample bottles are sequentially placed in the pressure tank 201, the cover motor 302 drives the rotating frame 301 to rotate, thereby driving the cover body 202 to flip from the first position to the second position, and then the locking motor 401 drives the cover body 202 to rotate from the second position to the third position;

[0071] Step S6: the pressure device 2 is started to keep the water sample bottle in a high temperature and high pressure state for a certain period of time to allow the water sample and the reagent to react;

[0072] Step S7: After the reaction is completed, the exhaust valve 207 is deflated, and the pressure device 2 is cooled down until the pressure device 2 is at normal pressure. The locking motor drives the cover 202 to rotate from the third position to the second position, and then the flip motor drives the cover 202 to flip from the second position to the first position.

[0073] Step S8: the moving mechanism 6 drives the rotating gripper 601 to grab the water sample bottle in the pressure tank 201 and put it into the fixed gripper 104 of the placement area 101, and then the rotating gripper 601 unscrews the bottle cap;

[0074] Step S9: the moving mechanism 6 drives the liquid collection needle 501 to move to the reagent bottle, absorbs the reagent and drips it into the water sample bottle to further process the water sample;

[0075] Step S10: After the water sample processing is completed, the moving mechanism 6 drives the liquid collection needle 501 to move to the water sample bottle, extracts water samples from the water sample bottle, and injects them into an external detection device such as a spectrophotometer for detection.

[0076] The embodiment of the present invention also provides a method for using a total phosphorus and total nitrogen analyzer, comprising: first placing a covered water sample bottle containing a water sample and a reagent bottle containing relevant reagents in the placement area 101, the mobile mechanism 6 drives the rotating gripper 601 to grab the covered water sample bottle to the position of the fixed gripper 104, the fixed gripper 104 clamps the water sample bottle, the rotating gripper 601 unscrews the bottle cap, and after unscrewing, the rotating gripper 601 moves the cover away, the liquid collection needle 501 on the mobile mechanism 6 moves to the reagent bottle, absorbs the reagent and drips it into the water sample bottle, the rotating gripper 601 transfers the bottle cap to the top of the water sample bottle again, the rotating gripper 601 grabs the bottle cap and covers the water sample bottle tightly, and then grabs the water sample bottle and puts it into the In the pressure tank 201, after all the water samples are placed in the pressure tank 201, the flip motor 302 drives the rotating frame 301 to rotate, thereby driving the cover body 202 to flip from the first position to the second position, and then the locking motor 401 drives the cover body 202 to rotate from the second position to the third position, completing the sealed connection between the cover body 202 and the pressure tank 201, and a sealing ring is provided at the opening of the cover body 202, and the sealing ring is used to seal the joint between the cover body 202 and the pressure tank 201; when opening the cover, the locking motor 401 drives the cover body 202 to rotate from the third position to the second position, and then the flip motor drives the cover body 202 to flip from the second position to the first position. The moving mechanism 6 drives the rotating gripper 601 to grab the water sample bottle in the pressure tank 201 and put it into the fixed gripper 104 of the placement area 101, and then the rotating gripper 601 opens the bottle cap, and the moving mechanism 6 drives the liquid collection needle 501 to move to the reagent bottle, absorbs the reagent and drips it into the water sample bottle to further process the water sample; after the water sample processing is completed, the moving mechanism 6 drives the liquid collection needle 501 to move to the water sample bottle, extracts the water sample from the water sample bottle, and injects it into an external spectrophotometer or other detection equipment for detection; the total phosphorus and total nitrogen analyzer can automatically process and detect water samples, reduce the labor intensity of operators, and improve detection efficiency.

[0077] Embodiment 2:

[0078] The difference from Example 1 is that: Figure 1 As shown, a receiving cavity for receiving the cover 202 is provided on one side of the frame 1, and a push switch is built in the receiving cavity (not shown in the drawings). When the cover 202 rotates to the first position, the cover 202 is embedded in the receiving cavity of the frame 1 and presses the push switch.

[0079] like Figure 1As shown, a laser emitter 612 is provided on the side of the cover 202 facing the protective plate 103, and a laser receiver (not shown in the drawings) matching the laser emitter 612 is provided on the side of the protective plate 103 facing the cover 202. The laser emitter, the laser receiver 612 and the driving mechanism in the multi-way rotary valve constitute a connection circuit. When the cover 202 is rotated to the first position, the cover 202 is in an open state and is arranged parallel to the protective plate 103. At this time, the laser receiver on the protective plate 103 is aligned with the laser emitter 612 on one side of the cover 202 to establish a connection.

[0080] In the present application, the multi-way rotary valve is a prior art. For example, the Chinese patent with publication number CN106523740A discloses a multi-way rotary valve for guiding the flow of liquid. The multi-way rotary valve includes a driving device that can be set to work continuously or intermittently according to the required outlet, and the driving mechanism is a stepper motor. In the present application, the driving mechanism is a stepper motor with a PLC control component. The present invention only lists the driving mechanism in the multi-way rotary valve as above and does not elaborate on the principle. All inventions and creations realized by those skilled in the art under the conception of the present invention belong to the protection scope of the present invention.

[0081] When the cover 202 rotates to the first position, the cover 202 acts on the push switch to simultaneously start the laser emitter 612 and the moving mechanism 6 (i.e., the X-axis drive device, the Y-axis drive device, the first Z-axis drive device, the second Z-axis drive device, etc.). When the cover 202 rotates from the first position toward the second position, the cover 202 moves away from the push switch so that the push switch is no longer pressed by the cover 202, so that the laser emitter 612 and the moving mechanism 6 stop operating at the same time.

[0082] Furthermore, the laser receiver is aligned with the laser transmitter 612 to construct a laser optical path. The connected state of the laser optical path corresponds to the first position of the multi-way rotary valve 503, and the blocked state of the laser optical path corresponds to the second position of the multi-way rotary valve 503. The Z-axis moving mechanism 608 controls the on-off of the laser optical path by moving, thereby driving the multi-way rotary valve 503 to switch between the first position and the second position.

[0083] In the above, when the Z-axis moving mechanism 608 is above the pressure tank 201, the blocking state of the laser light path can be triggered, and the blocking state of the laser light path includes partial blocking and complete blocking. Whether it is partial blocking or complete blocking, the multi-way rotary valve 503 should be in the second position.

[0084] In the above, the connection state and the blocking state of the laser light path are fed back to the PLC control component respectively. The PLC control component controls the stepper motor to switch the multi-way rotary valve 503 between the first position and the second position.

[0085] Take the moving mechanism 6 as an example: when the cover 202 is in the state of being engaged with the pressure tank 201, since the cover 202 is not rotated to open, there is interference between the existence of the cover 202 and the operation of the moving mechanism 6. In particular, when the cover 202 switches between the first position and the second position, the rotation of the cover 202 requires space, and the movement of the moving mechanism 6 (such as the Z-axis moving mechanism 608) above the pressure tank 201 also requires space, so that the space above the pressure tank 201 is used in a state where the cover 202 and the moving mechanism 6 are used selectively.

[0086] Taking the liquid taking mechanism 5 as an example, there are two situations for the movement of the Z-axis moving mechanism 608:

[0087] (1) The Z-axis moving mechanism 608 moves above the placement area 101. At this time, the laser light path is in a connected state corresponding to the first position of the multi-way rotary valve 503. The liquid collection needle 501 is connected to the injection pump 502, which can drive the liquid collection needle 501 to move to the test tube containing the reagent to absorb the reagent. After absorbing the reagent, the liquid collection needle 501 is moved to the water sample bottle to inject the reagent into the water sample to be tested.

[0088] (2) When the Z-axis moving mechanism 608 moves above the pressure tank 201, the laser light path is in a blocked state to correspond to the second position of the multi-way rotary valve 503. The liquid collection needle 501 is connected to the water pump, and the water pump is used to communicate with the water tank. The water pump draws water from the liquid collection needle 501 and discharges it into the pressure tank 201.

[0089] Application examples:

[0090] In this embodiment, when conducting a total nitrogen test on water quality, first measure 0.00, 0.20, 0.50, 1.00, 3.00 and 7.00 ml of potassium nitrate standard solution into different 25 ml colorimetric tubes with caps, and then dilute to 10.00 ml with water. The corresponding total nitrogen (in terms of N) contents are 0.00, 2.00, 5.00, 10.0, 30.0 and 70.0 μg, respectively. In addition, 10.00 ml of water sample is measured and put into a 25 ml water sample bottle, and the colorimetric tube and the water sample bottle are placed in the placement area 101. 5.00 ml of alkaline potassium persulfate solution is added to the solution and water sample through the cooperation of the mobile mechanism 6 and the liquid taking mechanism 5, and the bottle cap is tightened. The colorimetric tube and the water sample bottle are placed in the pressure device 2 through the rotating gripper 601 and the mobile mechanism 6, and the pressure device 2 is started, heated to 120°C and the timing is started, and the temperature is kept between 120 and 124°C for 30 minutes. Natural cooling, the pressure in the pressure tank 201 is reduced through the exhaust valve 207, the cover 202 is opened, and the colorimetric tube and the water sample bottle are taken out through the rotating gripper 601 and placed in the placement area 101 to cool to room temperature.

[0091] Add 1.0 ml of hydrochloric acid solution to each colorimetric tube and water sample bottle, dilute with water to the 25 ml mark, and tighten the bottle cap. Use a 10 mm quartz cuvette on a UV spectrophotometer, with water as a reference, to measure the absorbance at wavelengths of 220 nm and 275 nm, respectively. The zero concentration corrected absorbance A b , other standard series of corrected absorbance A s and its difference A r Calculate according to formula (1), (2) and (3). Take total nitrogen (in N) content (μg) as the horizontal axis, and the corresponding A r The value is the vertical axis and the calibration curve is drawn.

[0092] A b =A b220 -2A b275 (1)

[0093] A s =A s220 -2A s275 (2)

[0094] A r =A s -A b (3)

[0095] Where:

[0096] A b ——calibrated absorbance of zero concentration (blank) solution;

[0097] A b220——Absorbance of zero concentration (blank) solution at a wavelength of 220nm;

[0098] A b275 ——Absorbance of zero concentration (blank) solution at a wavelength of 275nm;

[0099] A s ——corrected absorbance of standard solution;

[0100] A s220 ——Absorbance of the standard solution at a wavelength of 220nm;

[0101] A s275 ——Absorbance of the standard solution at a wavelength of 275nm;

[0102] A r ——The difference between the corrected absorbance of the standard solution and the corrected absorbance of the zero concentration (blank) solution.

[0103] Calculate the results by referring to formulas (1) to (3) to calculate the difference A between the sample corrected absorbance and the blank test corrected absorbance r , the mass concentration ρ (mg / L) of total nitrogen in the water sample is calculated according to formula (4).

[0104]

[0105] Where:

[0106] ρ——mass concentration of total nitrogen (in terms of N) in the water sample, mg / L;

[0107] A r ——The difference between the corrected absorbance of the sample and the corrected absorbance of the blank test;

[0108] a——intercept of the calibration curve;

[0109] b – the slope of the calibration curve;

[0110] V——sample volume, ml;

[0111] f——dilution factor.

[0112] In this embodiment, when conducting a total phosphorus test on water quality, first measure 0.0, 0.50, 1.00, 3.00, 5.00, 10.0, and 15.0 ml of phosphate standard solution in different 50 ml covered colorimetric tubes, then add water to dilute to 25.00 ml, take 25 ml of water sample and put it into the water sample bottle, put the above colorimetric tube and water sample bottle into the placement area 101, add 4 mL of potassium persulfate into the colorimetric tube and the water sample bottle through the cooperation of the moving mechanism 6 and the liquid taking mechanism 5, tighten the bottle cap, and place the colorimetric tube and the water sample bottle in the pressure device 2 for heating through the rotating gripper 601 and the moving mechanism 6. The pressure device 2 is started and the pressure reaches 1.1 kg / cm 2 When the corresponding temperature is 120°C, keep it for 30 minutes and then stop heating. Cool naturally, reduce the pressure in the pressure tank 201 through the exhaust valve 207, open the cover 202, take out the colorimetric tube and the water sample bottle through the rotating gripper 601 and cool them to room temperature; then dilute the solution in the colorimetric tube and the water sample bottle to 50ml with water through the cooperation of the moving mechanism 6 and the liquid taking mechanism 5.

[0113] After the treated colorimetric tube and the water sample bottle are placed at room temperature for 15 minutes, the absorbance is measured at a wavelength of 700 nm using a colorimetric dish with an optical path of 30 mm and water as a reference. After deducting the absorbance of the blank test, a working curve is drawn with the corresponding phosphorus content. The phosphorus content is then checked based on the drawn working curve.

[0114] The total phosphorus content is expressed as C (mg / L) and is calculated according to formula (5):

[0115]

[0116] Where:

[0117] m——phosphorus content of the sample measured, μg;

[0118] v——volume of sample for determination, mL.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0120] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0121] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A total phosphorus and total nitrogen measuring instrument, characterized in that: include: The rack is provided with a placement area, the placement area is used to place water sample bottles and reagent bottles, and the water sample bottles are provided with bottle caps; The pressure device comprises a pressure tank, a cover body, a flip mechanism and a locking mechanism, wherein the pressure tank is arranged on the frame, the flip mechanism is arranged on the frame, the flip mechanism comprises a rotating frame and a flip motor, the cover body is rotatably arranged on the rotating frame, the flip motor is transmission-connected with the rotating frame, and the flip mechanism can drive the cover body to flip to a first position and a second position; the locking mechanism is arranged on the rotating frame, the locking mechanism comprises a locking motor, the locking motor is transmission-connected with the cover body, and the locking motor can drive the cover body to rotate to a second position and a third position, and when the cover body is in the third position, the cover body and the pressure tank are sealed and connected; The liquid collection mechanism at least comprises a liquid collection needle and a syringe pump, wherein the liquid collection needle is connected to the syringe pump, the syringe pump is arranged on the frame, and the position of the liquid collection needle corresponds to the position of the placement area; A moving mechanism, wherein the moving mechanism is arranged on the frame, the liquid collection needle is arranged on the moving mechanism, the moving mechanism is used to drive the liquid collection needle to move, a rotating gripper is also arranged on the moving mechanism, and a fixed gripper is also arranged on the frame, and the position of the fixed gripper corresponds to the position of the rotating gripper.

2. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: The placement area is provided with a tray, the tray is used to place water sample bottles, the water sample bottles are provided with bottle caps, the position of the rotating gripper corresponds to the position of the bottle cap, the rotating gripper is used to twist the bottle cap, and a plurality of reagent bottles are also provided on the placement area.

3. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: The opening of the pressure tank extends outward to form a plurality of first locking portions, and the opening of the cover body extends inward to form a plurality of second locking portions. When the cover body is in the third position, the lower portion of the first locking portion abuts against the upper portion of the second locking portion.

4. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: A pressure sensor and a temperature sensor are provided in the pressure tank, and an exhaust valve is also provided at the pressure sensor. An electric heating tube is provided inside the pressure tank, and the electric heating tube is located at the lower part of the pressure tank. A water level sensor is provided in the pressure tank, and the position of the water level sensor corresponds to the position of the electric heating tube. A water inlet pipe is also provided on the pressure tank, and the water inlet pipe passes through the pressure tank and extends into the interior of the pressure tank. A water inlet valve is also provided on the water inlet pipe, and the water inlet valve is provided outside the pressure tank.

5. The total phosphorus and total nitrogen measuring instrument according to claim 4, characterized in that: The locking mechanism comprises a locking gear, a locking rack is arranged on the cover body, the locking gear is meshed with the locking rack, and the locking motor is transmission-connected with the locking gear.

6. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: The frame is provided with a protection plate, and the position of the protection plate corresponds to the position of the pressure device.

7. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: The liquid collection mechanism also includes a multi-way rotary valve and a water pump. When the multi-way rotary valve is in a first position, the liquid collection needle is connected to the injection pump. When the multi-way rotary valve is in a second position, the liquid collection needle is connected to the water pump. The water pump is used to connect to a water tank.

8. The total phosphorus and total nitrogen measuring instrument according to claim 7, characterized in that: The liquid collection mechanism further comprises a cleaning tank, the position of which corresponds to the position of the liquid collection needle, and a drainage port is arranged at the bottom of the cleaning tank.

9. The total phosphorus and total nitrogen measuring instrument according to claim 1, characterized in that: The moving mechanism includes an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, the X-axis moving mechanism includes an X-axis moving guide rail and an X-axis driving device, the Y-axis moving mechanism is installed on the X-axis moving guide rail, and the X-axis driving device drives the Y-axis moving mechanism to slide on the X-axis moving guide rail, the Y-axis moving mechanism includes a Y-axis moving guide rail and a Y-axis driving device, the Z-axis moving mechanism includes a Z-axis guide block, a first Z-axis driving device and a second Z-axis driving device, the Z-axis guide block and the Z-axis guide block are installed on the Y-axis moving guide rail, the Y-axis driving device drives the Z-axis moving mechanism to slide on the Y-axis moving guide rail, the liquid collection needle is installed on the Z-axis guide block, the first Z-axis driving device drives the liquid collection needle to slide on the Z-axis guide block, the rotating gripper is installed on the Z-axis guide block, and the second Z-axis driving device drives the rotating gripper to slide on the Z-axis guide block.

10. The method for using the total phosphorus and total nitrogen measuring instrument according to any one of claims 1 to 9, characterized in that: include: Step S1: placing the water sample bottle containing the water sample on the placement area, and placing the reagent bottle containing the relevant reagent on the placement area; Step S2: the moving mechanism drives the rotating gripper to grab the water sample bottle with a cover to the fixed gripper position, the fixed gripper clamps the water sample bottle, the rotating gripper unscrews the bottle cap, and after unscrewing, the rotating gripper drives the bottle cap to move away; Step S3: the liquid collection needle on the moving mechanism moves to the reagent bottle, absorbs the reagent and drips it into the water sample bottle; Step S4: the rotating gripper transfers the water sample bottle cap to the top of the water sample bottle again, the rotating gripper grabs the bottle cap and tightens the water sample bottle, and then the rotating gripper grabs the water sample bottle and puts it into the pressure tank; Step S5: After all the water sample bottles are placed in the pressure tank, the cover flip motor drives the rotating frame to rotate, thereby driving the cover body to flip from the first position to the second position, and then the locking motor drives the cover body to rotate from the second position to the third position; Step S6: the pressure device is started to keep the water sample bottle in a high temperature and high pressure state for a certain period of time to allow the water sample and the reagent to react; Step S7: After the reaction is completed, the pressure device is cooled down to make the interior of the pressure device at normal pressure, the locking motor drives the cover body to rotate from the third position to the second position, and then the flip motor drives the cover body to flip from the second position to the first position; Step S8: the moving mechanism drives the rotating gripper to grab the water sample bottle in the pressure tank and place it in the placement area, and then the rotating gripper unscrews the bottle cap; Step S9: the moving mechanism drives the liquid collection needle to move to the reagent bottle, absorbs the reagent and drips it into the water sample bottle to further process the water sample; Step S10: After the water sample is processed, the moving mechanism drives the liquid collection needle to move to the water sample bottle, extracts water samples from the water sample bottle, and injects them into an external detection device such as a spectrophotometer for detection.

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