Calcium and magnesium online analyzer with constant-temperature light source

Abstract

The calcium and magnesium online analyzer comprises a box body, a control system and a detection system, and the detection system is provided with a constant-temperature detection device and comprises a detector shell, a detector rear cover, an assembly base, a detection cup, a magnetic stirrer, a light source emitting assembly, a light source receiving assembly and a semiconductor chilling plate. The semiconductor chilling plate is tightly attached to the light source emitting assembly, so that the light source emitting assembly keeps constant temperature, light source heating attenuation is avoided, light intensity stability is guaranteed, a light source assembling hole transversely penetrates through the assembling base, the light source emitting assembly and the light source receiving assembly are kept on the same straight line all the time, and light path errors are reduced. A plurality of reagent tubes are arranged in the cup body and are matched with a plurality of switching valves and pumps to realize full-automatic sample introduction, reagent addition, stirring, detection, waste discharge and cleaning, and the full-automatic detection cup has the advantages of compact structure, accurate temperature control, stable work and high detection accuracy, and is particularly suitable for on-line automatic detection and analysis of high-concentration calcium and magnesium ions in saline water.

Description

Technical Field

[0001] This utility model relates to the field of chemical analysis equipment, specifically to an online calcium and magnesium analyzer with a constant temperature light source. Background Technology

[0002] Currently, the detection of calcium and magnesium ion concentrations in brine in the chlor-alkali industry is mostly carried out by manual laboratory titration or offline analysis, which has problems such as cumbersome operation, long time consumption, and inability to monitor online in real time.

[0003] Existing automated calcium and magnesium analyzers still have the following shortcomings in practical use: First, the light source emitting component is prone to overheating during operation, causing the light intensity to decrease with increasing temperature, directly affecting the stability and repeatability of the detection results; Second, the light source emitting and receiving components are difficult to keep precisely aligned after long-term use or disassembly, causing optical path deviation and reducing detection accuracy; Third, the detection cup is usually fixed inside the instrument, making cleaning or replacement difficult, maintenance inconvenient, and sometimes resulting in poor sealing, which can easily cause contamination and corrosion of components; Fourth, the multi-channel reagent switching and delivery structure is complex, with messy tubing, which is not conducive to system integration and troubleshooting; Furthermore, the structure and detection method of the detection device are not entirely suitable for high concentrations of calcium and magnesium ions. Therefore, it is necessary to develop an online calcium and magnesium analyzer with high detection stability, reliable optical path alignment, convenient maintenance, and a compact structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an online calcium and magnesium analyzer with a constant-temperature light source.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An online calcium and magnesium analyzer with a constant-temperature light source includes a housing, a switch door installed at the rear of the housing, a control system installed at the rear of the housing, a detection system installed on the inner front side of the housing and controlled by wiring from the control system, and a power switch and a USB data export port located on the side of the housing and connected to the control system. The detection system includes a constant-temperature detection device, a feed pump located on one side of the constant-temperature detection device, a pure water switching three-way solenoid valve located below and connected to the feed pump, a feed switching three-way solenoid valve located above the feed pump and connected to both the feed pump and the constant-temperature detection device, a discharge pump located on the other side of the constant-temperature detection device and connected to it, and a discharge pump located on the other side of the constant-temperature detection device. The above-mounted hydrochloric acid reagent delivery peristaltic pump, sodium hydroxide delivery peristaltic pump, EDTA delivery peristaltic pump, and colorimetric reagent injection pump are connected to the constant temperature detection device. The constant temperature detection device includes a detector housing, a detector back cover fixedly installed to the detector housing, an assembly base fixedly installed inside the detector housing, a detection cup fixedly installed on the upper end of the assembly base, a magnetic stirrer fixedly installed on the lower end of the assembly base, a light source emitting assembly installed on one side of the assembly base, a light source receiving assembly installed on the other side of the assembly base and aligned with the center line of the light source emitting assembly, a semiconductor cooling chip fixedly installed on and in close contact with the light source emitting assembly, and a terminal block fixedly installed on the bottom plate of the detector back cover.

[0007] Preferably, the top of the detector housing has a circular hole, and a stud hole is provided on the top of the detector housing near the circular hole. A hand-tightening stud is installed on the stud hole, and a limiting ring with a protruding post is fitted on the hand-tightening stud.

[0008] Furthermore, the assembly base has two cavities, upper and lower, with a transverse partition between them. The upper cavity of the assembly base has a cylindrical chamber that is coaxial with the circular hole. The test cup is installed in the cylindrical chamber of the upper cavity of the assembly base and placed on the upper side of the transverse partition. The magnetic stirrer is fixedly installed in the lower cavity of the assembly base through the lower side of the transverse partition. Light source assembly holes are transversely opened on both side walls of the assembly base corresponding to the lower part of the test cup.

[0009] Preferably, the testing cup includes a cup lid, a quartz cup body sealed to the cup lid, and a magnetic stir bar placed at the bottom of the quartz cup body; the cup lid and the quartz cup body are connected by a threaded rotation; a positioning groove is provided on one side of the upper part of the cup lid, and several through holes are provided on the upper part of the cup lid.

[0010] Furthermore, there are six perforated holes, which are evenly arranged along the upper edge of the cup lid. The quartz cup body is equipped with a feed reagent tube, a discharge reagent tube, a hydrochloric acid reagent tube, a sodium hydroxide reagent tube, an EDTA reagent tube, and a colorimetric reagent tube. The feed reagent tube, discharge reagent tube, hydrochloric acid reagent tube, sodium hydroxide reagent tube, EDTA reagent tube, and colorimetric reagent tube are respectively connected to the feed switching three-way solenoid valve, the discharge pump, the hydrochloric acid reagent delivery peristaltic pump, the sodium hydroxide delivery peristaltic pump, the EDTA delivery peristaltic pump, and the colorimetric reagent injection pump through the corresponding perforated holes on the cup lid. The wall of the perforated hole is sealed with the outer wall of the corresponding pipe passing through it. A one-way valve is also installed at the bottom of the colorimetric reagent tube.

[0011] Preferably, the light source emitting assembly includes a hollow light source emitting housing with slots at both ends, a light source emitting end sapphire lens mounted on the end of the light source emitting housing facing the mounting base, a light-emitting diode embedded and fixed inside the light source emitting housing with its light source end facing the light source emitting end sapphire lens, and a temperature probe embedded at the lower end of the light source emitting housing and in contact with the light-emitting diode.

[0012] Furthermore, the light source receiving assembly includes a hollow light source receiving housing with slots at both ends, a sapphire lens at the end of the light source receiving housing facing the mounting base, and a light source receiver fixed at the other end of the light source receiving housing.

[0013] Preferably, the semiconductor cooling chip has a circular ring-shaped structure with a through hole in the center.

[0014] Preferably, the pure water switching three-way solenoid valve is provided with a pure water inlet, a pure water / salt water switching delivery inlet, and a saline inlet.

[0015] Preferably, the feed switching three-way solenoid valve is provided with a feed pump port, a detection cup feed port, and a discharge port.

[0016] Preferably, the control system includes a power board, a PLC controller, and a 24V switching power supply installed on the door. The control system also includes a wiring control board installed on the back of the enclosure and connected to the PLC controller, and a touch screen installed on the front door of the enclosure.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) When the temperature probe detects that the temperature of the light-emitting diode of the light source emitting component reaches the upper limit of the set temperature range, the semiconductor cooling chip in the constant temperature detection device is activated to cool the light-emitting diode separately, which can quickly keep it in a constant temperature range, avoid the light intensity decay caused by the heat of the light source, thereby extending the life of the light source and ensuring the stability of the detection light, and improving the detection accuracy. In addition, the center lines of the light source emitting component and the light source receiving component are kept strictly in the same straight line through the light source mounting hole of the mounting base, which reduces the optical path deviation and further improves the detection accuracy. The semiconductor cooling chip cools the light-emitting diode separately, which changes the existing method of cooling the entire detection device. It can avoid affecting the liquid to be tested in the detection cup, and also avoid the phenomenon of large temperature fluctuation range and long temperature control time caused by cooling more components such as the detection cup. It significantly improves the detection accuracy, and is also more energy-saving and cost-effective, improving the detection efficiency.

[0019] (2) After the colorimetric reagent injection pump completes the injection, the one-way valve can effectively prevent the mixed solution in the test cup from flowing back into the colorimetric reagent tube due to pressure fluctuations or liquid level differences, thus avoiding cross-contamination. Therefore, the volume of colorimetric reagent pushed by the injection pump each time can accurately enter the test cup, and the actual dosage will not be reduced or bubbles will appear in the pipeline due to backflow, thereby ensuring the quantitative accuracy of the colorimetric reaction. In addition, the one-way valve blocks the acidic or alkaline solution (such as hydrochloric acid and sodium hydroxide) in the test cup from flowing back into the colorimetric reagent delivery pipeline and injection pump, avoiding corrosion or blockage of precision parts and extending the service life of the equipment. At the same time, the one-way valve keeps the colorimetric reagent pipeline full of reagent, and there is no need to vent or pre-fill it when adding the reagent next time, which improves the continuity and response speed of the detection process.

[0020] (3) The test cup lid is connected to the quartz cup body by a thread, which greatly improves the sealing performance and prevents the liquid or volatile gas in the cup from overflowing, contaminating and corroding the components, causing equipment failure and affecting the measurement results; at the same time, it also makes installation and maintenance more convenient and faster.

[0021] (4) Combining the coaxial fixed structure of the light source emission and receiving components, the uniform stirring function of the magnetic stirrer, and the multi-channel reagent automatic switching and delivery system, it achieves the overall advantages of compact structure, convenient operation, high degree of automation and easy maintenance on the basis of ensuring high detection accuracy and repeatability. It is especially suitable for online automatic detection and analysis of calcium and magnesium ions in salt water with relatively high calcium and magnesium ion concentration. Attached Figure Description

[0022] Figure 1 This is a structural diagram of an online calcium and magnesium analyzer with a constant temperature light source according to the present invention;

[0023] Figure 2 for Figure 1 Internal structure diagram;

[0024] Figure 3 for Figure 2 Exploded view of the constant temperature detection device;

[0025] Figure 4 for Figure 3 A schematic diagram of the installation of the medium magnetic stirrer in the mounting base. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention. Example

[0027] like Figure 1-4 As shown, an online calcium and magnesium analyzer with constant temperature light source includes a housing 1, a switch door 2 installed at the rear of the housing 1, a control system 3 installed at the rear of the housing 1, a detection system 4 installed on the inner front of the housing 1 and controlled by wiring through the control system 3, and a power switch 5 and a USB data export port 6 located on the side of the housing 1 and connected to the control system 3.

[0028] The control system 3 includes a power board 31, a PLC controller 32 and a 24V switching power supply 33 installed on the switch door 2. The PLC controller 32 and the 24V switching power supply 33 are arranged side by side. The control system 3 also includes a wiring control board 34 installed on the back of the enclosure 1 and connected to the PLC controller 32, and a touch screen 35 installed on the front door of the enclosure 1.

[0029] The detection system 4 includes a constant temperature detection device 41, a feed pump 42 located on one side of the constant temperature detection device 41, a pure water switching three-way solenoid valve 43 located below and connected to the feed pump 42, a feed switching three-way solenoid valve 44 located above the feed pump 42 and connected to both the feed pump 42 and the constant temperature detection device 41, a discharge pump 45 located on the other side of the constant temperature detection device 41 and connected to the constant temperature detection device 41, and a hydrochloric acid reagent delivery peristaltic pump 46, a sodium hydroxide delivery peristaltic pump 47, an EDTA delivery peristaltic pump 48, and a colorimetric reagent injection pump 49 located above and connected to the constant temperature detection device 41.

[0030] Specifically, the constant temperature detection device 41 is fixedly installed in the lower center of the box 1. The feed pump 42, pure water switching three-way solenoid valve 43, feed switching three-way solenoid valve 44, discharge pump 45, hydrochloric acid reagent delivery peristaltic pump 46, sodium hydroxide delivery peristaltic pump 47, EDTA delivery peristaltic pump 48, and color developer injection pump 49 are distributed around the constant temperature detection device 41 and fixedly installed in the box 1. In addition, the wires of the above components are gathered at the rear of the box 1 and centrally connected to the wiring control board 34, which makes the overall layout compact, the wiring management clear, saves space, and facilitates maintenance and troubleshooting.

[0031] The constant temperature detection device 41 includes a detector housing 411, a detector rear cover 412 fixedly mounted to the detector housing 411, a mounting base 413 fixedly mounted inside the detector housing 411, a detection cup 414 fixedly mounted on the upper end of the mounting base 413, a magnetic stirrer 415 fixedly mounted on the lower end of the mounting base 413, a light source emitting assembly 416 mounted on one side of the mounting base 413, a light source receiving assembly 417 mounted on the other side of the mounting base 413 and aligned with the center line of the light source emitting assembly 416, and a light source receiving assembly 417 fixedly mounted on and in close contact with the light source emitting assembly 416. The semiconductor cooling chip 418 is fixedly mounted on the terminal block 419 on the bottom plate of the detector rear cover 412. Specifically, the magnetic stirrer 415, the light source emitting assembly 416, the light source receiving assembly 417, and the semiconductor cooling chip 418 are all connected to the terminal block 419. The terminal block 419 is connected to the wiring control board 34 through wires. The light source emitting assembly 416 and the light source receiving assembly 417 are located on the side walls of the mounting base 413 at positions corresponding to the lower part of the detection cup 414. The mounting base 413 is first fixed to the detector rear cover 412 and the bottom plate of the detector rear cover 412 and then installed inside the detector housing 411.

[0032] The detector housing 411 has a round hole 4111 on its top. A stud hole 4112 is provided on the top of the detector housing 411 near the round hole 4111. A hand-tightening stud 4113 is installed on the stud hole 4112. A limiting ring 4114 with a protrusion is fitted on the hand-tightening stud 4113.

[0033] The assembly base 413 is an assembly base with two internal cavities, an upper cavity and a transverse partition between the two cavities. Specifically, the upper cavity of the assembly base 413 is provided with a cylindrical chamber that is coaxial with the circular hole 4111. The test cup 414 is installed in the cylindrical chamber of the upper cavity of the assembly base 413 and is placed on the upper side of the transverse partition of the assembly base 413. The magnetic stirrer 415 is fixedly installed in the lower cavity of the assembly base 413 through the lower side of the transverse partition.

[0034] Light source mounting holes 4131 are transversely opened on both sides of the mounting base 413, corresponding to the lower part of the detection cup 414. Specifically, the light source mounting holes 4131 on both sides of the mounting base 413 are located in the lower part of the detection cup 414. This facilitates the assembly of the light source emitting assembly 416, the semiconductor cooling chip 418, and the light source receiving assembly 417 from both ends of the light source mounting holes 4131. This ensures that the positions of the light source emitting assembly 416 and the light source receiving assembly 417 on the two sides of the mounting base 413 correspond to the lower part of the detection cup 414, so that the center lines of the light source emitting assembly 416 and the light source receiving assembly 417 are always below the liquid surface in the detection cup 414. Furthermore, the light source mounting holes 4131 ensure that the center lines of the light source emitting assembly 416 and the light source receiving assembly 417 are always kept on the same straight line, thereby reducing optical path deviation and improving detection accuracy.

[0035] The test cup 414 includes a cup lid 4141, a quartz cup body 4142 sealed to the cup lid 4141, and a magnetic stir bar 4143 placed at the bottom of the quartz cup body 4142. The cup lid 4141 and the quartz cup body 4142 are connected by a threaded rotation, which improves the sealing performance of the cup lid 4141 to the quartz cup body 4142, prevents internal liquids and volatile gases from leaking out through the connection and corroding external components, and also improves the convenience of installation and disassembly.

[0036] It should be noted that a positioning groove 41411 is provided on the upper side of the cup lid 4141. Specifically, the detection cup 414 is inserted from the top of the detector housing 411, so that the quartz cup body 4142 is inserted into the upper end of the mounting base 413, while the cup lid 4141 is snapped onto the top of the detector housing 411. At this time, the protrusion on the limiting ring 4114 is engaged in the positioning groove 41411. Then, the hand screw 4113 is tightened. By pressing down the hand screw 4113 to tighten the limiting ring 4114, the detection cup 414 is fixed, which can effectively prevent the rotation of the detection cup 414, thus realizing the rotation positioning of the detection cup 414.

[0037] It should be noted that the cup lid 4141 has several through holes 41412 on its upper part. The number of through holes 41412 can be determined according to the specific needs. Specifically, there are 6 through holes 41412, which are evenly distributed along the upper edge of the cup lid 4141. The quartz cup body 4142 contains a feed reagent tube 41413, a discharge reagent tube 41414, a hydrochloric acid reagent tube 41415, a sodium hydroxide reagent tube 41416, an EDTA reagent tube 41417, and a color developer reagent tube 41418. The tube 41418 is connected to the feed switching three-way solenoid valve 44, the discharge pump 45, the hydrochloric acid reagent delivery peristaltic pump 46, the sodium hydroxide delivery peristaltic pump 47, the EDTA delivery peristaltic pump 48, and the color developer injection pump 49 through the corresponding through-hole 41412 on the cup lid 4141. The wall of the through-hole 41412 is sealed with the outer wall of the corresponding pipeline passing through it to prevent internal liquids and volatile gases from overflowing through the gap between the through-hole and the pipeline and corroding external components. A one-way valve 41419 is also installed at the bottom of the color developer reagent tube 41418. The one-way valve 41419 installed at the bottom of the color developer reagent tube 41418 can effectively prevent brine from flowing back into the color developer reagent tube 41418 and contaminating the color developer.

[0038] In this embodiment, the magnetic stirrer 415 includes a fixed bracket 4152, a stirring motor 4151 fixedly installed below the fixed bracket 4152 with its output end located above the fixed bracket 4152, a magnet base 4153 fixedly installed on the output end of the stirring motor 4151, and a magnet column 4154 fixedly installed on the magnet base 4153. Specifically, the magnetic stirrer 415 is entirely embedded in the lower cavity of the mounting base 413, and the fixed bracket 4152 is fixedly installed to the lower side of the transverse partition of the mounting base 413 by screws. The magnet base 4153 with the magnet column 4154 faces the bottom of the detection cup 414, and the magnet column 4154 attracts the magnetic stir bar 4143. When the stirring motor 4151 rotates the magnet base 4153, it can drive the magnetic stir bar 4143 to rotate and stir the mixed solution inside the detection cup 414.

[0039] The light source emitting assembly 416 includes a hollow light source emitting housing 4161 with slots at both ends, a light source emitting end sapphire lens 4162 that is mounted on the end of the light source emitting housing 4161 facing the mounting base 413, a light-emitting diode 4163 that is embedded and fixed inside the light source emitting housing 4161 with its light source end facing the light source emitting end sapphire lens 4162, and a temperature probe 4164 that is embedded at the lower end of the light source emitting housing 4161 and contacts the light-emitting diode 4163.

[0040] When the temperature probe 4164 detects that the temperature of the light-emitting diode 4163 of the light source emitting component 416 exceeds the upper limit of the set temperature range, the thermoelectric cooler 418 starts working to cool down the light-emitting diode 4163 of the light source emitting component 416 until it reaches the preset value and then stops working. The purpose is to keep the light-emitting diode 4163 of the light source emitting component 416 within a constant temperature range, extend its service life, and prevent the light intensity from decreasing due to the heat generated by the light-emitting diode 4163 of the light source emitting component 416, which would affect the normal operation and accuracy of the detection. In addition, the thermoelectric cooler 418 is in close contact with the light-emitting diode 4163 of the light source emitting component 416, and only cools the light-emitting diode 4163. This avoids affecting the solution in the detection cup 414 and also avoids the problem of large temperature fluctuations and long temperature control time caused by the thermoelectric cooler 418 cooling the detection cup and other components. This significantly improves the detection accuracy and efficiency, while also being more energy-efficient and reducing costs.

[0041] The light source receiving assembly 417 includes a hollow light source receiving housing 4171 with slots at both ends, a light source receiving end sapphire lens 4172 that is fitted onto the end of the light source receiving housing 4171 facing the mounting base 413, and a light source receiver 4173 that is embedded and fixed at the other end of the light source receiving housing 4171.

[0042] It should be noted that the semiconductor cooling chip 418 has a ring-shaped structure with a through hole 4181 in the center. Specifically, the power line of the light-emitting diode 4163 can be led out through the through hole 4181 and connected to the terminal 419.

[0043] The pure water switching three-way solenoid valve 43 is equipped with a pure water inlet 431, a pure water-salt water switching delivery inlet 432, and a saline inlet 433. Specifically, the pure water-salt water switching delivery inlet 432 is connected to the feed pump 42 through a pipeline to realize the automatic switching between pure water and the sample solution to be tested, and supports pipeline cleaning and sample injection functions.

[0044] The feed switching three-way solenoid valve 44 is equipped with a feed pump connector 441, a test cup feed connector 442, and a discharge connector 443. Specifically, the feed pump connector 441 is connected to the feed pump 42, and the test cup feed connector 442 is connected to the feed reagent tube 41413 inside the test cup 414. This enables automatic switching between the sample feeding and waste discharge pipelines, simplifying pipeline control.

[0045] It should be further explained that, since the inlet and outlet pipes of the feed pump are used for quantitative measurement of the sample solution, their lengths can be designed according to process requirements to achieve quantitative measurement of different volumes. At the same time, the amount of pure water pumped into the saline sample solution by the feed pump can also be determined by the running time of the feed pump, which can meet the dilution requirements of saline solutions with high calcium and magnesium ion concentrations, thereby meeting the detection requirements of the detector and realizing online detection and analysis of calcium and magnesium ions in saline solutions with high calcium and magnesium ion concentrations.

[0046] The operating steps of the entire analyzer are as follows:

[0047] (1) When the feed pump 42 rotates forward, the pure water and brine switching delivery port 432 of the pure water switching three-way solenoid valve 43 is connected to the brine input port 433, and the feed pump docking port 441 of the feed switching three-way solenoid valve 44 is connected to the discharge docking port 443. The brine is drawn in from the brine input port 433 and then discharged through the feed pump 42 to the discharge docking port 443, so that the inlet pipe and outlet pipe of the feed pump 42 are kept with the freshest brine.

[0048] (2) Connect the pure water and brine switching delivery port 432 of the pure water switching three-way solenoid valve 43 to the pure water input port 431, and connect the feed pump port 441 of the feed switching three-way solenoid valve 44 to the test cup feed port 442. The feed pump 42 rotates forward, and while drawing in pure water, it also flushes the brine in the inlet pipe and outlet pipe of the feed pump 42 into the test cup 414. It stops after reaching the set value.

[0049] (3) The hydrochloric acid reagent delivery peristaltic pump 46 rotates forward, drawing hydrochloric acid into the inlet and discharging it from the outlet into the test cup 414. The magnetic stirrer 415 is turned on and pauses slightly to convert the magnesium hydroxide and calcium carbonate contained in the mixed solution into soluble magnesium chloride and calcium chloride. The sodium hydroxide delivery peristaltic pump 47 rotates forward, drawing sodium hydroxide into the inlet and discharging it from the outlet into the test cup 414. The magnetic stirrer 415 is turned on to make the salt solution in the test cup alkaline. The light source receiver 4173 in the light source receiver assembly 417 automatically locks the light source to the set value. The piston of the colorimetric reagent injection pump 49 moves upward, pushing the colorimetric reagent into the colorimetric reagent tube 41418 of the test cup 414 and discharging it through the one-way valve 41419. The magnetic stirrer 415 is turned on and runs, driving the magnetic stir bar 4143 to rotate and stir the mixed solution inside the test cup 414. After stirring, it stops, and the detector records the first absorbance.

[0050] (4) The EDTA delivery peristaltic pump 48 rotates forward, sucking EDTA into the inlet and discharging it into the test cup 414 from the outlet. The magnetic stirrer 415 is turned on, driving the magnetic stir bar 4143 to rotate and stir the mixed solution inside the test cup 414. After stirring, the stirring stops, and the detector records the absorbance for the second time.

[0051] (5) The PLC controller 32 calculates the difference between the first absorbance and the second absorbance, substitutes it into the slope formula calibrated with the standard solution, and obtains the result;

[0052] (6) The discharge pump 45 rotates forward, drawing the liquid in the test cup 414 into the inlet of the discharge pump 45 and discharging it from the outlet of the discharge pump 45;

[0053] (7) When the magnetic stirrer 415 is turned on, connect the pure water and brine switching delivery port 432 of the pure water switching three-way solenoid valve 43 to the pure water input port 431, connect the feed pump port 441 of the feed switching three-way solenoid valve 44 to the test cup feed port 442, rotate the feed pump 42 forward, pump the pure water into the test cup 414, and then close all the open parts;

[0054] (8) The feed pump port 441 of the feed switching three-way solenoid valve 44 is connected to the feed port 442 of the test cup, and the pure water and brine switching delivery port 432 of the pure water switching three-way solenoid valve 43 is connected to the brine input port 433. The feed pump 42 reverses to draw out the pure water in the test cup 414 and discharge it from the brine input port 433 to clean the feed pipe and prevent crystallization.

[0055] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A calcium and magnesium online analyzer with constant temperature light source, comprising a housing, a switch door installed at the rear of the housing, a control system installed at the rear of the housing, a detection system installed on the inner front side of the housing and controlled by wiring through the control system, and a power switch and a USB data export port located on the side of the housing and connected to the control system, characterized in that, The detection system includes a constant temperature detection device, a feed pump located on one side of the constant temperature detection device, a pure water switching three-way solenoid valve located below the feed pump and connected to the feed pump, a feed switching three-way solenoid valve located above the feed pump and connected to both the feed pump and the constant temperature detection device, a discharge pump located on the other side of the constant temperature detection device and connected to the constant temperature detection device, and a hydrochloric acid reagent delivery peristaltic pump, a sodium hydroxide delivery peristaltic pump, an EDTA delivery peristaltic pump, and a colorimetric reagent injection pump located above the constant temperature detection device and connected to the constant temperature detection device; the constant temperature detection device includes a detector housing, a detector back cover fixedly installed to the detector housing, an assembly base fixedly installed inside the detector housing, a detection cup fixedly installed on the upper end of the assembly base, a magnetic stirrer fixedly installed on the lower end of the assembly base, a light source emitting assembly installed on one side of the assembly base, a light source receiving assembly installed on the other side of the assembly base and aligned with the center line of the light source emitting assembly, a semiconductor cooling chip fixedly installed on and close to the light source emitting assembly, and a terminal block fixedly installed on the bottom plate of the detector back cover.

2. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The detector housing has a round hole at the top and a stud hole at the top of the detector housing near the round hole. A hand-tightening stud is installed in the stud hole, and a limiting ring with a protruding post is fitted on the hand-tightening stud.

3. The online calcium and magnesium analyzer with constant temperature light source according to claim 2, characterized in that, The assembly base has two cavities, upper and lower, with a transverse partition between them. The upper cavity of the assembly base has a cylindrical chamber that is coaxial with the circular hole. The test cup is installed in the cylindrical chamber of the upper cavity of the assembly base and placed on the upper side of the transverse partition. The magnetic stirrer is fixedly installed in the lower cavity of the assembly base through the lower side of the transverse partition. Light source assembly holes are transversely opened on both side walls of the assembly base corresponding to the lower part of the test cup.

4. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The testing cup includes a cup lid, a quartz cup body sealed to the cup lid, and a magnetic stir bar placed at the bottom of the quartz cup body; the cup lid and the quartz cup body are connected by a threaded rotation; a positioning groove is provided on the upper side of the cup lid, and several through holes are provided on the upper part of the cup lid.

5. The online calcium and magnesium analyzer with constant temperature light source according to claim 4, characterized in that, The number of perforations is 6, and the 6 perforations are evenly arranged along the upper edge of the cup lid. The quartz cup body is provided with a feed reagent tube, a discharge reagent tube, a hydrochloric acid reagent tube, a sodium hydroxide reagent tube, an EDTA reagent tube, and a color developer reagent tube. The feed reagent tube, discharge reagent tube, hydrochloric acid reagent tube, sodium hydroxide reagent tube, EDTA reagent tube, and color developer reagent tube are respectively connected to the feed switching three-way solenoid valve, the discharge pump, the hydrochloric acid reagent delivery peristaltic pump, the sodium hydroxide delivery peristaltic pump, the EDTA delivery peristaltic pump, and the color developer injection pump through the corresponding perforation holes on the cup lid. The wall of the perforation hole is sealed with the outer wall of the corresponding pipe passing through it. A one-way valve is also installed at the bottom of the color developer reagent tube.

6. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The light source emitting assembly includes a hollow light source emitting shell with slots at both ends, a light source emitting end sapphire lens that is mounted on the end of the light source emitting shell facing the mounting base, a light-emitting diode that is embedded and fixed inside the light source emitting shell with its light source end facing the light source emitting end sapphire lens, and a temperature probe that is embedded at the lower end of the light source emitting shell and contacts the light-emitting diode. The light source receiving assembly includes a hollow light source receiving shell with slots at both ends, a sapphire lens at the end of the light source receiving shell facing the mounting base, and a light source receiver at the other end of the light source receiving shell.

7. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The semiconductor cooling chip has a circular ring-shaped structure with a through hole in the center.

8. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The pure water switching three-way solenoid valve is equipped with a pure water inlet, a pure water / salt water switching delivery inlet, and a saline inlet.

9. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The feed switching three-way solenoid valve is equipped with a feed pump port, a detection cup feed port, and a discharge port.

10. The online calcium and magnesium analyzer with constant temperature light source according to claim 1, characterized in that, The control system includes a power board, a PLC controller, and a 24V switching power supply installed on the door. The control system also includes a wiring control board installed on the back of the enclosure and connected to the PLC controller, and a touch screen installed on the front door of the enclosure.

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