Analyzing device for detecting chloride ions by using ion selective electrode

Abstract

The invention belongs to the technical field of ion detection equipment, and particularly relates to an ion selective electrode detection chloride ion analysis device. Comprising a fixing plate, a lifting mechanism and a detection assembly, the lifting mechanism is arranged on the fixing plate, the detection assembly is connected to the lower portion of the lifting mechanism, the detection assembly comprises a shell, a piston and a detection rod, the shell is arranged on the fixing plate, an open hole is formed in the bottom of the shell, and the piston is arranged in the open hole. An annular vertical wall is vertically arranged on the opening towards the inner side direction of the shell, the piston is arranged in the cavity in a sliding mode and connected with the lifting mechanism, a driving part is arranged between the annular vertical wall and the side wall of the detection rod, and the driving part drives the detection rod to rotate along with lifting of the piston. An electrode point is arranged on the side face of the bottom of the detection rod, the bottom face of the detection rod is connected with an umbrella-shaped head, and the umbrella-shaped head rotates along with the detection rod and is used for discharging foam on the liquid level; bubbles can be prevented from being in contact with electrode points during detection.

Description

Technical Field

[0001] The invention belongs to the technical field of ion detection equipment, and in particular relates to an analysis device for detecting chloride ions with an ion selective electrode. Background Art

[0002] The core principle of the selective electrode detection chloride ion analysis device is based on ion selective electrode technology. When the electrode is placed in the solution to be tested, a series of electrochemical reactions will occur on the electrode surface, and the extent of these reactions is directly related to the concentration of chloride ions in the solution. Specifically, the reference electrode inside the instrument provides a stable potential reference, while the working electrode (i.e., the chloride ion selective electrode) is responsible for measuring the potential changes caused by chloride ions in the solution. As the concentration of chloride ions increases, the potential difference between the working electrode and the reference electrode will increase accordingly. This change is converted into a readable digital or analog signal through the precision circuit inside the instrument, and finally displayed intuitively on the display.

[0003] Chloride ion analysis devices are generally used in drinking water testing, industrial wastewater testing, swimming pool water quality testing, chemical laboratory solution analysis, pharmaceutical industry and marine aquaculture. When used for industrial wastewater testing, when the wastewater contains a large amount of organic matter, microorganisms will produce a large amount of gas in the process of decomposing these organic substances. When the gas is exposed to the water surface, it is easy to produce a large number of tiny bubbles and form foam on the water surface. Surfactants and other chemical substances in industrial wastewater are more likely to form foam under the influence of chloride ions. In addition, when chloride ions are present in water, chloride ions can reduce the surface tension of water, making it easier for water to form bubbles. When detecting the content of chloride ions in the solution, it is necessary to put a working electrode and a reference electrode in the solution. A large number of bubbles in the water are likely to adhere to the electrode and enter the water with the electrode. The bubbles adhered to the electrode will cause the contact area between the electrode and the solution to be limited. The reduction in contact area means that the number of chloride ions that can be contacted by the electrode surface is reduced, which leads to a weakening of the electrode's response signal to chloride ions and a decrease in sensitivity. This may result in the electrode being unable to accurately capture signal changes when measuring low concentrations of chloride ions, resulting in low measurement results or inaccurate readings.

[0004] In order to solve this problem, a bubble removal device for online detection of tantalum-niobium smelting wastewater in Chinese patent CN220552812U includes a detection box, a shaking mechanism is fixedly connected to the rear side of the detection box, the detection box includes a fluorine electrode, a water inlet, a drain, a valve and a water outlet, the fluorine electrode is movably connected to the upper end of the inner cavity of the detection box, the upper end of the water inlet is fixedly connected to the left side of the lower end of the detection box, the upper end of the drain is fixedly connected to the lower end of the detection box, the valve is fixedly connected to the surface of the drain, the left side of the water outlet is fixedly connected to the right side of the detection box, and the shaking mechanism includes a frame, an electromagnet, a spring, an iron block, a fixed rod, a time controller, an electric storage bin and a fixed assembly, which is used in conjunction with the detection box, the fluorine electrode, the valve and the shaking mechanism, and the fluorine electrode is driven to shake through the shaking mechanism to remove the bubbles generated on the surface of the fluorine electrode; however, shaking can only cause the bubbles to form displacement, but it is difficult to eliminate the bubbles, and the bubbles after shaking are still easy to contact the electrode. In order to avoid this problem, the present invention proposes an ion selective electrode to detect chloride ions. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an ion selective electrode for detecting chloride ions.

[0006] The purpose of the present invention can be achieved through the following technical solutions: An ion selective electrode chloride ion analysis device comprises a fixed plate, a lifting mechanism and a detection component, wherein the lifting mechanism is arranged on the fixed plate, the detection component is connected below the lifting mechanism, the detection component comprises a shell, a piston and a detection rod, the shell is arranged on the fixed plate, an opening is arranged at the bottom of the shell, an annular wall is arranged vertically toward the inner side of the shell, a cavity is formed between the annular wall and the inner side wall of the shell, the piston is slidably arranged in the cavity and connected to the lifting mechanism, the top of the detection rod is rotatably engaged in the piston and extends out of the shell along the annular wall and the opening, a driving part is arranged between the annular wall and the side wall of the detection rod, the driving part drives the detection rod to rotate with the lifting of the piston, an electrode point is arranged on the side of the bottom of the detection rod, an umbrella-shaped head is connected to the bottom surface of the detection rod, and the umbrella-shaped head rotates with the detection rod to discharge foam on the liquid surface.

[0007] Furthermore, the diameter of the umbrella-shaped head is larger than the diameter of the detection rod.

[0008] Furthermore, the driving part includes an external thread formed on a side surface of the detection rod and an internal thread formed on the annular vertical wall, and the internal thread and the external thread are meshed with each other.

[0009] Furthermore, the detection rod includes a large column section, which is rotatably embedded in the inner wall of the piston, and the top and bottom of the protruding part of the large column section are provided with balls that roll and abut against the top and bottom of the inner wall of the piston.

[0010] Furthermore, a plurality of fan blades are provided at the bottom of the umbrella-shaped head, and the plurality of fan blades are used to increase the stirring force on the liquid surface.

[0011] Furthermore, some of the fan blades are arc-shaped fan blades, and the fan blades rotate as the detection rod rotates. Some of the fan blades rotate in the forward direction as the detection rod descends, and some of the fan blades rotate in the reverse direction as the detection rod rises.

[0012] Furthermore, a water inlet and a water outlet are provided at the bottom of the cavity, and a one-way valve is provided in the water inlet and the water outlet. Water enters the cavity as the piston rises and water is discharged as the piston descends. The water in the cavity is used to clean the electrode points on the detection rod when the detection rod rises with the piston.

[0013] Furthermore, the annular vertical wall is a hollow structure.

[0014] Furthermore, the lifting mechanism is a cylinder, and the telescopic rod of the cylinder is connected to the top of the piston.

[0015] Furthermore, a sealing ring is embedded on the inner side surface of the annular vertical wall, and the sealing ring abuts against the side wall of the detection rod.

[0016] The beneficial effects of the present invention are: (1) A driving part is provided on the annular vertical wall and the side wall of the detection rod. Since the top of the detection rod is provided in the piston, the detection rod moves with the up and down movement of the piston, and the driving part can use the kinetic energy of the up and down movement of the piston to drive the detection rod to rotate. The umbrella-shaped head at the bottom of the detection rod is at the bottom and can contact the liquid surface of the detected liquid before the electrode point of the detection rod. Since the umbrella-shaped head rotates during the descent process, when there is foam on the liquid surface, the umbrella-shaped head can push the foam to the side by rotating while the detection rod is extended into the water at the same time, so that the electrode point enters below the liquid surface to avoid contact with the foam on the liquid surface, thereby improving the accuracy of the detection of the chloride ion concentration in the detected liquid and reducing the interference caused by the foam in the liquid; (2) The piston moves upward to move the detection rod upward. At the same time, the negative pressure formed in the cavity will draw the water outside the water inlet into the cavity to clean the electrode points on the detection rod. After the cleaning is completed, the next sample will be tested. At this time, the piston moves downward to push the detection rod downward. At the same time, the piston discharges the waste liquid in the cavity to the outside of the shell through the water outlet. In order to avoid mutual interference between the inlet and outlet of the water inlet and outlet under the two states, a one-way valve is provided in the water inlet and outlet. The water in the water inlet can only enter but not exit, while the water in the water outlet can only exit but not enter. The up and down movement of the piston not only pushes the detection rod up and down, but also rotates the detection rod through the drive unit. It can also control the inlet and outlet of the liquid in the cavity to clean the electrode points, achieving multiple functional effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a front structural schematic diagram of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the enlarged structure of the detection component of the present invention; Figure 4 It is a schematic diagram of the fan blade structure of the present invention; Figure 5 for Figure 1 Enlarged view of point A in the middle.

[0019] Explanation of the accompanying drawings: 1. fixing plate; 2. cylinder; 3. shell; 4. piston; 5. detection rod; 6. umbrella-shaped head; 7. fan blade; 8. electrode point; 9. water inlet; 10. water outlet; 11. annular wall; 12. external thread. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] like Figure 1-Figure 5As shown, an ion selective electrode chloride ion analysis device of the present invention comprises a fixed plate 1, a lifting mechanism and a detection component, the lifting mechanism is arranged on the fixed plate 1, the detection component is connected to the bottom of the lifting mechanism, the detection component comprises a shell 3, a piston 4 and a detection rod 5, the shell 3 is arranged on the fixed plate 1, an opening is arranged at the bottom of the shell 3, an annular wall 11 is arranged vertically toward the inner side of the shell 3, a cavity is formed between the annular wall 11 and the inner side wall of the shell 3, the piston 4 is slidably arranged in the cavity and connected to the lifting mechanism, the top of the detection rod 5 is rotatably engaged in the piston 4 and extends out of the shell 3 along the annular wall 11 and the opening, a driving part is arranged between the annular wall 11 and the side wall of the detection rod 5, the driving part drives the detection rod 5 to rotate with the lifting of the piston 4, an electrode point 8 is arranged on the side of the bottom of the detection rod 5, an umbrella-shaped head 6 is connected to the bottom surface of the detection rod 5, the diameter of the umbrella-shaped head 6 is larger than the diameter of the detection rod 5, and the umbrella-shaped head 6 rotates with the detection rod 5 to discharge the foam on the liquid surface; Since working electrodes and reference electrodes need to be placed in the solution when the chloride ion content in the solution is detected by the detection device, a large number of bubbles in the water are likely to adhere to the electrodes and enter the water with the electrodes. In addition, the higher the concentration of chloride ions in the water, the lower the water tension, which makes it easier for bubbles to form. The bubbles adhering to the electrodes will limit the contact area between the electrodes and the solution. The reduced contact area means that the number of chloride ions that can be contacted by the electrode surface is reduced, which leads to a weaker response signal of the electrode to chloride ions and a decrease in sensitivity. This may result in the electrode being unable to accurately capture signal changes when measuring low concentrations of chloride ions, resulting in low measurement results or inaccurate readings; Therefore, in order to prevent the electrode point 8 from being adhered by the foam, when the detection rod 5 is used for detection, the detection rod 5 rotates while moving downward, and the centrifugal force generated by the rotation pushes the foam to disperse. Specifically, the fixed plate 1 is installed on the detection frame, and the lifting mechanism installed on the fixed plate 1 is the cylinder 2, and the shell 3 is also connected to the fixed plate 1. The piston 4 in the shell 3 is a through structure, and the piston 4 is sleeved on the detection rod 5. The detection rod 5 is clamped in the piston 4, and after the sleeve connection, the through hole on the top of the piston 4 is covered by the cover plate, so that the detection rod 5 is installed in the piston 4, and finally the telescopic rod of the cylinder 2 is connected to the cover plate of the piston 4, and the piston 4 is driven by the cylinder 2 to move up and down in the shell 3. The shell 3 has a cylindrical structure, and has an annular wall 11 inside the shell 3 connected to the opening at the bottom of the shell 3. The length of the annular wall 11 inside the shell 3 is shorter than the length of the piston 4. The piston 4 is arranged in a cavity between the annular wall 11 and the shell 3, and each side surface of the piston 4 is respectively in contact with the inner wall of the shell 3 and the side surface of the annular wall 11.

[0022] In order to realize the rotation of the detection rod 5 during the up and down reciprocating movement of the piston 4, a driving part is provided on the annular vertical wall 11 and the side wall of the detection rod 5. Since the top of the detection rod 5 is arranged in the piston 4, the detection rod 5 moves along with the up and down movement of the piston 4, and the driving part can drive the detection rod 5 to rotate with the kinetic energy of the up and down movement of the piston 4. The umbrella-shaped head 6 at the bottom of the detection rod 5 is at the bottom and can contact the liquid surface of the detected liquid before the electrode point 8 of the detection rod 5. Since the umbrella-shaped head 6 rotates during the descent process, when there is foam on the liquid surface, The umbrella-shaped head 6 can push the foam aside by rotating, and some of the foam that is not pushed away will be pressed into the water by the bottom of the umbrella-shaped head 6. Different from the prior art in which the electrode point 8 is arranged at the bottom, the electrode point 8 in this embodiment is located on the side of the detection rod 5. Since the foam will only float on the liquid surface without external force, the detection rod 5 is simultaneously extended into the water while the foam is pushed away by the umbrella-shaped head 6, so that the electrode point 8 enters below the liquid surface and avoids contact with the foam on the liquid surface, thereby improving the accuracy of the detection of the chloride ion concentration in the detected liquid and reducing the interference caused by the foam in the liquid.

[0023] When the detection rod 5 rotates and extends into the water, the foam on the liquid surface is discharged through the umbrella-shaped head 6. However, the foam is fluid. There is a probability that the water waves will hit the side wall of the container after being discharged and push the foam in the reverse direction toward the detection rod 5. The electrode point 8 is set on the side wall of the detection rod 5. If the diameter of the umbrella-shaped head 6 is the same as the diameter of the detection rod 5, it may cause poor foam dispersal effect. Therefore, in one embodiment, the diameter of the umbrella-shaped head 6 is larger than the diameter of the detection rod 5.

[0024] In one embodiment, the driving part includes an external thread 12 provided on the side of the detection rod 5 and an internal thread provided on the annular wall 11, and the internal thread and the external thread 12 are meshed with each other; the number of turns of the external thread 12 on the side wall of the detection rod 5 can be relatively large, and is set according to the up and down movement range of the detection rod 5, while the number of internal threads on the annular wall 11 is relatively small, so as to reduce the friction between the internal thread and the external thread 12. When the detection rod 5 moves up and down with the piston 4, the external thread 12 on the detection rod 5 rotates along the direction of the internal thread on the annular wall 11, and the rotation direction of the detection rod 5 changes with the up and down movement direction of the detection rod 5. It can not only dispel foam and bubbles when the detection rod 5 is extended into the water, but also dispel foam and bubbles when the detection rod 5 is extended out of the water.

[0025] In the above embodiment, the detection rod 5 needs to rotate while moving with the up and down movement of the piston 4, and a large friction force will be generated in this process, resulting in the detection rod 5 not rotating smoothly. In order to reduce the friction force between the detection rod 5 and the piston 4, in one embodiment, the detection rod 5 includes a large column section, which is rotatably embedded in the inner wall of the piston 4, and the top and bottom of the protruding part of the large column section are provided with balls that roll and abut against the top and bottom of the inner wall of the piston 4; The large column section is located at the top of the detection rod 5, and a corresponding groove is also provided in the piston 4 for installing the large column section of the detection rod 5. When the detection rod 5 is installed in the piston 4, the detection rod 5 is put in from the top of the piston 4 until the bottom of the large column section of the detection rod 5 abuts against the top of the groove in the piston 4. After the cover plate on the piston 4 is closed, the top of the large column section abuts against the top of the cover plate of the piston 4. In order to reduce friction, balls are provided at the contact positions of the large column section with the top of the groove and the bottom of the cover plate to reduce the friction between the detection rod 5 and the piston 4.

[0026] In the above embodiment, the foam and bubbles on the water surface are dispersed by the rotation of the umbrella-shaped head 6 at the bottom of the detection rod 5, and the side wall of the general umbrella-shaped head 6 is smooth, and the centrifugal force generated on the water surface during its rotation is relatively small. In order to improve the dispersing effect of the foam and bubbles on the water surface, in one embodiment, a plurality of fan blades 7 are provided at the bottom of the umbrella-shaped head 6, and the plurality of fan blades 7 are used to increase the stirring force on the liquid surface; The fan blades 7 at the bottom of the umbrella-shaped head 6 are vertically arranged at the bottom of the umbrella-shaped head 6. After the fan blades 7 come into contact with the foam and bubbles on the liquid surface, some of the bubbles and foam can be broken by the rotational force. Until the fan blades 7 come into contact with the liquid surface, the stirring action of the fan blades 7 on the water is greater, and the foam and bubbles on the liquid surface can be pushed farther. When the detection rod 5 is extended out of the water after the detection is completed, the greater stirring action of the fan blades 7 on the water can also disperse the foam on the water surface, avoiding adhesion to the side wall of the detection rod 5, and avoiding affecting the next detection.

[0027] Since the high concentration of chloride ions will reduce the tension of the liquid, it is easy to generate more foam and bubbles when it is stirred and dispersed by the fan blades 7. In order to avoid this problem, some of the fan blades 7 are arc-shaped fan blades 7, and the fan blades 7 rotate as the detection rod 5 rotates. Some of the fan blades 7 rotate in the forward direction as the detection rod 5 descends, and some of the fan blades 7 rotate in the reverse direction as the detection rod 5 rises. In order to enable the fan blade 7 to push the foam and bubbles on the liquid surface farther while reducing the generation of new bubbles and foam when rotating, the fan blade 7 is in an arc shape, and the convex side of the arc of the fan blade 7 needs to be in the same direction of rotation as the fan blade 7 when the detection rod 5 descends, and in the opposite direction of rotation to the fan blade 7 when the detection rod 5 rises. Specifically, there is a convex side and a concave side in the arc-shaped fan blade 7. When the convex side of all the fan blades 7 faces the direction of rotation in the water, the arc surface will form an inclination angle with the direction of water flow, and the impact force of the liquid on the convex side of the fan blade 7 is also small, and it will gradually diffuse outward after the collision. Therefore, during rotation, it can not only ensure sufficient driving force for the liquid and disperse the foam and bubbles, but also avoid the collision of the liquids after stirring to generate bubbles; and in the process of the detection rod 5 extending out of the water, since the detection rod 5 rotates in the opposite direction, the concave side of the fan blade 7 faces the direction of rotation, which will generate a greater stirring force. Although new foam is generated while dispersing a large amount of foam, the detection of the detected liquid has been completed, so it will not affect the detection result.

[0028] When testing a large number of test samples, generally, after the fixing plate 1, the lifting mechanism and the test assembly are installed on the test frame, a test turntable is arranged below the test frame, and a number of test platforms are arranged on the test turntable for placing containers, so that multiple samples can be tested quickly. In the intervals between the tests of multiple samples, the electrode points 8 need to be cleaned to prevent the liquid of the previous sample remaining on the electrode points 8 from interfering with the next test result. In order to avoid this problem, in one embodiment, a water inlet 9 and a water outlet 10 are arranged at the bottom of the cavity, and a one-way valve is arranged in the water inlet 9 and the water outlet 10. Water enters the cavity as the piston 4 rises, and water is discharged as the piston 4 descends. The water in the cavity is used to clean the electrode points 8 on the test rod 5 when the test rod 5 rises with the piston 4. Since there is a sliding abutment between the piston 4 and the inner wall of the shell 3, when the piston 4 moves upward, a cavity will be formed in the shell 3 at the bottom of the piston 4, and the cavity is under negative pressure. When a water inlet 9 and a water outlet 10 leading to the outside of the shell 3 are provided in the cavity and connected to a water pipe, after each detection of the detection rod 5 is completed, the detection rod 5 is moved upward by moving the piston 4 upward. At the same time, the negative pressure formed in the cavity will suck the water outside the water inlet 9 into the cavity to clean the electrode point 8 on the detection rod 5. After the cleaning is completed, the next sample will be tested again. At this time, the piston 4 moves downward to push the detection rod 5 to move downward. At the same time, the piston 4 discharges the waste liquid in the cavity to the outside of the shell 3 through the water outlet 10. In order to avoid mutual interference between the inlet and outlet actions of the water inlet 9 and the water outlet 10 in the two states, a one-way valve is provided in the water inlet 9 and the water outlet 10. The water in the water inlet 9 can only enter but not exit, while the water in the water outlet 10 can only exit but not enter. The up and down movement of the piston 4 not only pushes the detection rod 5 up and down but also rotates the detection rod 5 through the driving unit, and can also control the inflow and outflow of liquid in the cavity to clean the electrode point 8, thus achieving multiple functional effects.

[0029] In order to enable the water in the cavity to clean the electrode point 8, in one embodiment, the annular vertical wall 11 is a hollow structure, and the water entering the cavity contacts the electrode point 8 along the hollow structure and cleans the electrode point 8.

[0030] In order to prevent the water in the cavity from being squeezed out from the opening at the bottom of the shell 3 due to the high pressure when the piston 4 moves downward and is discharged, causing it to drip into the sample to be tested and cause sample contamination, in one embodiment, a sealing ring is embedded on the inner side surface of the annular wall 11, and the sealing ring abuts against the side wall of the detection rod 5. The sealing ring makes the abutment between the annular wall 11 and the detection rod 5 tighter.

[0031] Working principle: the telescopic rod of the cylinder 2 drives the piston 4 to move up and down in the shell 3, and the up and down movement of the piston 4 drives the up and down movement of the detection rod 5. In the process of the up and down movement of the detection rod 5, the external thread 12 on the detection rod 5 and the internal thread on the annular wall 11 mesh and make the detection rod 5 move and rotate at the same time. Through the rotation of the detection rod 5, the fan blades 7 at the bottom break and disperse the bubbles and foams on the liquid surface to prevent the bubbles and foams from contacting the electrode point 8 of the detection rod 5; when the detection rod 5 rises, the piston 4 moves upward to form a negative pressure in the cavity and sucks the water outside the water inlet 9 into the cavity, which is used for cleaning the electrode point 8 after the detection rod 5 is reset. In the process of the detection rod 5 descending again, the downward movement of the piston 4 will squeeze the water in the cavity from the water outlet 10 to complete the cleaning of the electrode point 8 of the detection rod 5. At the same time, the sealing ring on the annular wall 11 can prevent the water in the cavity from dripping into the liquid sample to be detected, thereby preventing contamination of the sample. By dispersing the foam and bubbles on the liquid surface and cleaning the electrode point 8, the detection accuracy of chloride ions can be improved, and the work efficiency is improved at the same time.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ion selective electrode for detecting chloride ions, characterized in that: The invention comprises a fixed plate, a lifting mechanism and a detection component, wherein the lifting mechanism is arranged on the fixed plate, and the detection component is connected to the lower part of the lifting mechanism. The detection component comprises a shell, a piston and a detection rod, wherein the shell is arranged on the fixed plate, and an opening is arranged at the bottom of the shell, and an annular wall is arranged vertically toward the inner side of the shell by the opening, and a cavity is formed between the annular wall and the inner side wall of the shell, and the piston is slidably arranged in the cavity and connected to the lifting mechanism, and the top of the detection rod is rotatably engaged in the piston and extends to the outside of the shell along the annular wall and the opening, and a driving part is arranged between the annular wall and the side wall of the detection rod, and the driving part drives the detection rod to rotate with the lifting and lowering of the piston, and an electrode point is arranged on the side surface of the bottom of the detection rod, and an umbrella-shaped head is connected to the bottom surface of the detection rod, and the umbrella-shaped head rotates with the detection rod to discharge the foam on the liquid surface.

2. The ion selective electrode for detecting chloride ions according to claim 1, characterized in that: The diameter of the umbrella-shaped head is greater than the diameter of the detection rod.

3. The ion selective electrode for detecting chloride ions according to claim 1, characterized in that: The driving part comprises an external thread formed on the side of the detection rod and an internal thread formed on the annular vertical wall, and the internal thread and the external thread are meshed with each other.

4. The ion selective electrode for detecting chloride ions according to claim 3, characterized in that: The detection rod includes a large column section, which is rotatably embedded in the inner wall of the piston. Balls are provided on the top and bottom of the protruding part of the large column section to roll and abut against the top and bottom of the inner wall of the piston.

5. The ion selective electrode for detecting chloride ions according to claim 2, characterized in that: A plurality of fan blades are arranged at the bottom of the umbrella-shaped head, and the plurality of fan blades are used to increase the stirring force on the liquid surface.

6. The ion selective electrode for detecting chloride ions according to claim 5, characterized in that: Some of the fan blades are arc-shaped fan blades, and the fan blades rotate as the detection rod rotates. Some of the fan blades rotate in the forward direction as the detection rod descends, and some of the fan blades rotate in the reverse direction as the detection rod rises.

7. The ion selective electrode for detecting chloride ions according to claim 1, characterized in that: A water inlet and a water outlet are provided at the bottom of the cavity, and a one-way valve is provided in the water inlet and the water outlet. Water enters the cavity as the piston rises and water is discharged as the piston descends. The water in the cavity is used to clean the electrode points on the detection rod when the detection rod rises with the piston.

8. The ion selective electrode for detecting chloride ions according to claim 7, characterized in that: The annular vertical wall is a hollow structure.

9. The ion selective electrode for detecting chloride ions according to claim 1, characterized in that: The lifting mechanism is a cylinder, and the telescopic rod of the cylinder is connected to the top of the piston.

10. The ion selective electrode for detecting chloride ions according to claim 1, characterized in that: A sealing ring is embedded on the inner side surface of the annular vertical wall, and the sealing ring abuts against the side wall of the detection rod.

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