Online pH detection and automatic cleaning instrument

Abstract

The invention relates to the technical field of pH detection, and provides an online pH detection and automatic cleaning instrument which comprises a box body, a pH display controller and a working module, the pH display controller and the working module are arranged in the box body, a circulation groove is fixed in the box body, a pH electrode is fixed on the inner side of the top of the circulation groove, and a water sample inlet, an acid liquor inlet, a tap water inlet and a water outlet are formed in the outer side of the box body; the pH value of a water sample can be measured, the electrodes can be cleaned in time, dirt, precipitates, biological membranes and other impurities on the surfaces of the circulating groove and the electrodes can be removed, interference of the substances on pH measurement is prevented, the accuracy and reliability of a measurement result are ensured, the risk that the electrodes are damaged due to pollution is reduced, and the service life of the water sample is prolonged. Compared with the prior art, maintenance cost and replacement frequency of the equipment are reduced, regular automatic cleaning can be achieved, the good state of the equipment can be kept, stable performance of the equipment can be kept for a long time, frequent manual disassembly and cleaning of the electrode are not needed, and manpower and time cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of pH detection, and in particular to an online pH detection and automatic cleaning instrument. Background Art

[0002] Online pH detector is an analytical instrument widely used in environmental monitoring, biopharmaceuticals, chemical production, water treatment and other fields to measure the pH value of liquid in real time. Existing online pH detectors mostly use electrode measurement method. The pH detection electrode is usually composed of a glass electrode and a reference electrode. The glass electrode responds selectively to the hydrogen ions in the solution. When it is immersed in the solution to be tested, the hydrogen ions in the solution will exchange with the hydrogen ions in the hydration layer on the surface of the glass membrane, thereby generating a potential difference on both sides of the glass membrane. The reference electrode provides a stable potential reference. By measuring the potential difference between the two electrodes, the pH value of the solution can be obtained.

[0003] The existing online pH tester has the following problems: When monitoring sewage or liquids containing a lot of impurities for a long time, the surface of the pH detection electrode is contaminated, resulting in measurement deviations. Therefore, the electrode needs to be frequently disassembled, cleaned or replaced manually, resulting in increased manpower and time costs. Especially after testing some liquids with high pH, ​​the operator's work is subject to greater safety risks.

[0004] In view of the above problems, existing patent technologies have also provided solutions, such as a pH online detector cleaning device disclosed in announcement number CN207215787U, which includes a fixed sleeve sleeved on the pH probe of the pH online detector, the fixed sleeve fixedly connected to the pH meter wiring post of the pH online detector, the inner wall of the fixed sleeve connected to the pH probe cleaning part, and also includes a driving structure for driving the pH probe cleaning part, the driving structure is connected to the fixed sleeve; the fixed sleeve has openings at both ends. The pH online detector cleaning device uses aeration to disturb the polyester fiber wool to brush the pH probe (pH detection electrode) in the sleeve to achieve the cleaning purpose, solving the problem that the pH online instrument needs to be cleaned manually on a regular basis. However, in order to ensure the cleaning coverage, the above-mentioned pH online detector cleaning device requires that the polyester fiber wool completely covers the pH probe, which will make it difficult to remove the liquid in the polyester fiber wool, thereby affecting the pH judgment of other liquids. In addition, a large number of holes need to be opened during aeration, resulting in a decrease in air pressure, which affects the flushing effect. In addition, only the pH probe (pH detection electrode) can be flushed. Since the online detection of the pH probe (pH detection electrode) is usually carried out in a closed detection tank, this cleaning method cannot flush the detection tank and has great limitations. Summary of the invention

[0005] The invention provides an online pH detection and automatic cleaning instrument, which solves the problem of pH detection electrode surface being contaminated in the prior art.

[0006] The technical scheme of the present invention is as follows: an online pH detection and automatic cleaning instrument, comprising a box body, a pH display controller and a working module arranged in the box body, a flow slot is fixed in the box body, a pH electrode is fixed on the inner side of the top of the flow slot, a water sample inlet, an acid liquid inlet, a tap water inlet and a water outlet are arranged on the outer side of the box body, an acid adding pump group for injecting acid into the flow slot through the acid liquid inlet, a water inlet pump group for injecting water sample into the flow slot through the water sample inlet, a tap water pump group for injecting cleaning water into the flow slot through the tap water inlet, and a drainage pump group for discharging the sewage cleaned in the flow slot;

[0007] The bottom of the pH electrode is provided with a conical surface, the diameter of which gradually decreases from top to bottom, the bottom inner wall of the flow groove is provided with a conical groove bottom, the diameter of which gradually increases from top to bottom, and the bottom of the flow groove is located at the periphery of the conical groove bottom to form an annular bottom cavity;

[0008] A cleaning mechanism is provided in the circulation groove, and the cleaning mechanism includes a water separation plate, the water separation plate is rotatably connected to the top inner wall of the circulation groove, the water outlet end of the tap water pump group leads to the water separation plate, the top outer wall of the circulation groove is fixed with a first driving motor that drives the water separation plate to rotate relative to the pH electrode, and a cleaning bracket is fixed to one side of the bottom of the water separation plate, the cleaning bracket is L-shaped, and the upper half of the cleaning bracket is provided with a first rotating member, and the first rotating member is provided with two first cleaning sprays for rotating and flushing the circumferential outer wall of the pH electrode or the circumferential inner wall of the circulation groove. The cleaning mechanism comprises a cleaning bracket, a cleaning mechanism in which a second driving motor is fixed to drive the first rotating member to rotate and adjust the flushing direction of the two first cleaning nozzles; a second rotating member is arranged on the lower half of the cleaning bracket; a second cleaning nozzle for rotating and flushing the conical surface or the bottom of the conical groove is arranged on the second rotating member; the second rotating member can adjust the flushing direction of the second cleaning nozzle under the transmission drive of the first rotating member; an elastic pressure member is arranged on the inner side of the top of the cleaning bracket to drive the two first cleaning nozzles to swing crosswise in cooperation with the water dividing plate when rotating circumferentially around the pH electrode.

[0009] Preferably, the bottom of the water diversion plate is provided with an outer bottom ring and an inner bottom ring located inside the outer bottom ring, a plurality of first arc-shaped protrusions are circumferentially spaced on the inner wall of the outer bottom ring, a plurality of second annular protrusions are circumferentially spaced on the outer wall of the inner bottom ring, a top ring is provided on the top of the water diversion plate, annular teeth are provided on the inner wall of the top ring, a spur gear is fixed to the output end of the first drive motor, and the spur gear is meshed with the annular teeth.

[0010] Preferably, the cleaning bracket includes an upper frame plate and a lower frame plate vertically fixed to the upper frame plate, and the upper frame plate and the lower frame plate are both hollow structures and communicate with the inner cavity of the water distribution tray.

[0011] Preferably, the first rotating member includes a first shaft rod, which is rotatably connected to the upper frame plate, the top of the first shaft rod passes through the water diversion plate and is fixedly connected to the output end of the second drive motor, a first bevel gear is fixed to the bottom of the first shaft rod, and a movable groove for the two first cleaning nozzles to swing up and down is opened on the first shaft rod, and a sliding bar for slidingly guiding the elastic pressure piece is fixed to the inner side of the top of the movable groove.

[0012] Preferably, the two first cleaning nozzles each include a first nozzle, the two first nozzles are respectively hinged in the movable groove through a rotating shaft, the two first nozzles are respectively connected to the inner cavity of the upper shelf plate through a first connecting pipe, the two first nozzles are fixed with first fan-shaped teeth that mesh with each other, and the first nozzle located at the upper part is fixed with second fan-shaped teeth.

[0013] Preferably, the elastic pressure piece includes a slider, a limiting groove is formed on the slider and is slidably connected to the slide bar, a rack meshing with the second sector-shaped teeth is fixed to the bottom of the slider, the slider is elastically connected to the first shaft rod through a spring, and one end of the slider is provided with a pressure head which abuts against the first arc-shaped protrusion or the second annular protrusion under the action of the spring force.

[0014] Preferably, the second rotating member includes a second shaft rod, the second shaft rod is rotatably connected to the lower frame plate, and a second bevel gear meshing with the first bevel gear is fixed to one end of the second shaft rod.

[0015] Preferably, the second cleaning nozzle includes a base, the base is fixed on a second shaft rod, a second nozzle is fixed on the base, a second connecting pipe communicating with the inner cavity of the lower shelf plate is provided on one side of the second nozzle, and the horizontal angle of the spraying direction of the second nozzle matches the taper of the conical surface and the bottom of the conical groove.

[0016] Preferably, the working module includes a V power supply, and a filter and a relay electrically connected to the V power supply.

[0017] Preferably, the acid adding pump group comprises an acid adding pipe, and the acid adding pipe is provided with an acid adding pump;

[0018] The water inlet pump group comprises a water sample inlet pipe, and the water sample inlet pipe is provided with a water sample inlet pump;

[0019] The drainage pump group includes a drainage pipe, on which a drainage electric valve and a drainage hand valve are arranged, and the drainage pipe is connected to an overflow pipe leading to the inner cavity of the flow tank, and the overflow pipe is provided with an overflow hand valve;

[0020] The tap water pump assembly comprises a tap water inlet pipe, on which a tap water inlet pump and a tap water inlet manual valve are arranged.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention can not only measure the pH value of water samples, but also clean the electrodes in time, remove dirt, sediment, biofilm and other impurities on the flow slot and the electrode surface, prevent these substances from interfering with the pH measurement, ensure the accuracy and reliability of the measurement results, reduce the risk of damage to the electrode due to contamination, reduce the maintenance cost and replacement frequency of the equipment, and can automatically clean the equipment regularly to keep it in good condition, so that it can maintain stable performance for a long time, without frequent manual disassembly and cleaning of the electrodes, saving manpower and time costs;

[0023] 2. In the present invention, the water separation plate is driven by the first driving motor to rotate in the outer circumferential direction of the pH electrode, and then the two first cleaning nozzles and the second cleaning nozzles on the cleaning bracket are driven to rotate synchronously. Under the extrusion of the elastic pressure piece and the second annular protrusion on the outer wall of the inner bottom ring, the two first cleaning nozzles can be driven to perform reciprocating cross-swing flushing on the pH electrode. In the process of the second cleaning nozzle rotating around the pH electrode, the second nozzle can form a conical flushing surface to perform covering rotation flushing on the conical surface. Through this flushing method, the water pressure can be maintained while ensuring a relatively small number of nozzles, and the cleaning efficiency of the electrode can be increased;

[0024] 3. In the present invention, the second driving motor drives the first rotating member to drive the two first cleaning nozzles to rotate, and the first rotating member drives the second rotating member to drive the second cleaning nozzle to rotate, so that the first nozzles of the two first cleaning nozzles are directly facing the circumferential inner wall of the circulation groove, and the inclination direction of the second nozzle of the second cleaning nozzle corresponds to the taper of the conical groove bottom, so that the two first nozzles can perform reciprocating cross-swing flushing on the inner wall of the circulation groove during the circumferential rotation in the circulation groove, and the second cleaning nozzle can form a conical flushing surface and cover the conical groove bottom during the circumferential rotation in the circulation groove by the second nozzle. Through this flushing method, it is possible to maintain water pressure and increase the cleaning efficiency of the circulation groove while ensuring that the number of nozzles is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0027] Figure 2This is a schematic diagram of the internal structure of the box body proposed by the present invention;

[0028] Figure 3 This is a schematic diagram of the various structural components inside the box body proposed by the present invention;

[0029] Figure 4 This is a schematic structural diagram of the cleaning mechanism proposed by the present invention in the first state;

[0030] Figure 5 This is a schematic structural diagram of the cleaning mechanism proposed by the present invention in the second state;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the cleaning mechanism proposed by the present invention;

[0032] Figure 7 This is a schematic diagram of the three-dimensional structure of the cleaning mechanism proposed by the present invention from another viewing angle;

[0033] Figure 8 This is a schematic diagram of the structure of the first rotating member proposed by the present invention;

[0034] Fig. 9 for Figure 8 The enlarged structural diagram at A in the middle;

[0035] Fig.10 This is a schematic diagram of the structure of the second rotating member proposed by the present invention;

[0036] Fig.11 This is a schematic diagram of the main operating process of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0037] Fig.12 A schematic diagram of the tap water cleaning process of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0038] Fig.13 A schematic diagram of the citric acid soaking process of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0039] Fig.14 A schematic diagram of the manual measurement process of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0040] Fig.15 A schematic diagram of the manual drainage process of the online pH detection and automatic cleaning instrument proposed by the present invention;

[0041] Fig.16 The display interface and function explanation of the pH display controller proposed by the present invention;

[0042] In the figure: 1, box; 11, water sample inlet; 12, acid inlet; 13, tap water inlet; 14, water outlet; 2, flow slot; 21, conical slot bottom; 22, annular bottom cavity; 3, working module; 31, filter; 32, 24V power supply; 33, relay; 4, cleaning mechanism; 41, water distribution plate; 411, outer bottom ring; 412, inner bottom ring; 413, first arc-shaped protrusion; 414, second annular protrusion; 415, top ring; 416, annular gear; 42, first drive motor; 421, spur gear; 43, cleaning bracket; 431, upper shelf; 432, lower shelf; 44, first cleaning nozzle; 441, first nozzle; 442, rotating shaft; 443, first connecting pipe; 444, first sector-shaped tooth; 445, second sector-shaped tooth; 45, elastic pressure piece; 451, slider; 452, limit groove; 453 , rack; 454, pressure head; 455, spring; 46, second rotating member; 461, second shaft; 462, second bevel gear; 47, second drive motor; 48, first rotating member; 481, first shaft; 482, first bevel gear; 483, movable groove; 484, slide bar; 49, second cleaning nozzle; 491, base; 492, second nozzle; 493, second connecting pipe; 5, pH electrode; 5 1. Conical surface; 6. Acid adding pump group; 61. Acid adding pipe; 62. Acid adding pump; 7. Water inlet pump group; 71. Water sample inlet pipe; 72. Water sample inlet pump; 8. Drain pump group; 81. Drain pipe; 82. Drain electric valve; 83. Drain manual valve; 84. Overflow pipe; 85. Overflow manual valve; 9. Tap water pump group; 91. Tap water inlet pipe; 92. Tap water inlet pump; 93. Tap water inlet manual valve; 10. pH display controller. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1 , Figure 2 and Figure 3The present invention provides a technical solution: an online pH detection and automatic cleaning instrument, comprising a box body 1, a pH display controller 10 and a working module 3 arranged in the box body 1, a circulation slot 2 is fixed in the box body 1, a pH electrode 5 is fixed on the inner side of the top of the circulation slot 2, a water sample inlet 11, an acid liquid inlet 12, a tap water inlet 13 and a water outlet 14 are arranged on the outer side of the box body 1, and an acid adding pump group 6 for injecting acid into the circulation slot 2 through the acid liquid inlet 12, a water inlet pump group 7 for injecting water sample into the circulation slot 2 through the water sample inlet 11, a tap water pump group 9 for injecting cleaning water into the circulation slot 2 through the tap water inlet 13, and a drainage pump group 8 for discharging the sewage cleaned in the circulation slot 2.

[0045] See also Figure 4 and Figure 5 A conical surface 51 is provided at the bottom of the pH electrode 5, and the diameter of the conical surface 51 gradually decreases from top to bottom. A conical groove bottom 21 is provided on the bottom inner wall of the flow groove 2, and the diameter of the conical groove bottom 21 gradually increases from top to bottom. The bottom of the flow groove 2 is located at the periphery of the conical groove bottom 21 to form an annular bottom cavity 22.

[0046] See also Figure 6 and Figure 7 A cleaning mechanism 4 is provided in the circulation groove 2, and the cleaning mechanism 4 includes a water separation plate 41, the water separation plate 41 is rotatably connected to the top inner wall of the circulation groove 2, the water outlet of the tap water pump group 9 leads to the water separation plate 41, and a first driving motor 42 is fixed to the top outer wall of the circulation groove 2 to drive the water separation plate 41 to rotate relative to the pH electrode 5. A cleaning bracket 43 is fixed to one side of the bottom of the water separation plate 41, and the cleaning bracket 43 is L-shaped. The upper half of the cleaning bracket 43 is provided with a first rotating member 48, and the first rotating member 48 is provided with two first cleaning nozzles 44 for rotating and flushing the circumferential outer wall of the pH electrode 5 or the circumferential inner wall of the circulation groove 2. A second driving motor 47 is fixed in the mechanism 4 for driving the first rotating member 48 to rotate and adjust the flushing direction of the two first cleaning nozzles 44. A second rotating member 46 is provided on the lower half of the cleaning bracket 43. A second cleaning nozzle 49 for rotating and flushing the conical surface 51 or the conical groove bottom 21 is provided on the second rotating member 46. The second rotating member 46 can adjust the flushing direction of the second cleaning nozzle 49 under the transmission drive of the first rotating member 48. An elastic pressure member 45 is provided on the inner side of the top of the cleaning bracket 43, which drives the two first cleaning nozzles 44 to swing crosswise in cooperation with the water diversion plate 41 when rotating circumferentially around the pH electrode 5.

[0047] See also Figure 6 and Figure 7The bottom of the water separation plate 41 is provided with an outer bottom ring 411 and an inner bottom ring 412 located inside the outer bottom ring 411, a plurality of first arc-shaped protrusions 413 are circumferentially arranged on the inner wall of the outer bottom ring 411, and a plurality of second annular protrusions 414 are circumferentially arranged on the outer wall of the inner bottom ring 412. A top ring 415 is provided on the top of the water separation plate 41, and an annular tooth 416 is provided on the inner wall of the top ring 415. A spur gear 421 is fixed to the output end of the first driving motor 42, and the spur gear 421 is meshed with the annular tooth 416. The spur gear 421 is driven to rotate by the first driving motor 42, and the meshing of the spur gear 421 and the annular tooth 416 drives the water separation plate 41 to rotate in the outer circumferential direction of the pH electrode 5, thereby driving the two first cleaning nozzles 44 and the second cleaning nozzle 49 on the cleaning bracket 43 to rotate synchronously.

[0048] Specifically, the cleaning bracket 43 includes an upper frame plate 431 and a lower frame plate 432 vertically fixed to the upper frame plate 431 . Both the upper frame plate 431 and the lower frame plate 432 are hollow structures and communicate with the inner cavity of the water distribution tray 41 .

[0049] See also Figure 8 The first rotating member 48 includes a first shaft rod 481, which is rotatably connected to the upper frame plate 431. The top of the first shaft rod 481 passes through the water diversion plate 41 and is fixedly connected to the output end of the second drive motor 47. A first bevel gear 482 is fixed to the bottom of the first shaft rod 481. A movable groove 483 for the two first cleaning nozzles 44 to swing up and down is opened on the first shaft rod 481. A slide bar 484 for slidingly guiding the elastic pressure piece 45 is fixed to the inner side of the top of the movable groove 483.

[0050] Further, the two first cleaning nozzles 44 each include a first nozzle 441, and the two first nozzles 441 are respectively hinged in the movable groove 483 through a rotating shaft 442, and the two first nozzles 441 are respectively communicated with the inner cavity of the upper frame plate 431 through a first connecting pipe 443, and the two first nozzles 441 are fixed with first sector teeth 444 that mesh with each other, and the first nozzle 441 located at the upper portion is fixed with second sector teeth 445. When the first nozzle 441 located at the upper portion swings back and forth, the first sector teeth 444 on the two first nozzles 441 mesh with each other, so that the first nozzle 441 located at the lower portion swings back and forth in the opposite direction relative to the first nozzle 441 located at the upper portion.

[0051] See also Fig. 9The elastic pressure piece 45 includes a slider 451, on which a limiting groove 452 is provided that is slidably connected to the slide bar 484. A rack 453 that meshes with the second sector tooth 445 is fixed at the bottom of the slider 451. The slider 451 is elastically connected to the first shaft 481 through a spring 455. One end of the slider 451 is provided with a pressure head 454 that abuts against the first arc-shaped protrusion 413 or the second annular protrusion 414 under the elastic force of the spring 455. During the circumferential rotation of the cleaning bracket 43 around the pH electrode 5, the pressure head 454 always abuts against the second annular protrusion 414 on the outer wall of the inner bottom ring 412 through the elastic force of the spring 455. Under the continuous squeezing of the second annular protrusion 414 and the elastic force of the spring 455, the slider 451 can slide back and forth on the slide bar 484.

[0052] See also Fig.10 The second rotating member 46 includes a second shaft rod 461, which is rotatably connected to the lower frame plate 432. A second bevel gear 462 meshing with the first bevel gear 482 is fixed to one end of the second shaft rod 461. A second cleaning nozzle 49 includes a base 491, which is fixed to the second shaft rod 461. A second nozzle 492 is fixed to the base 491. A second connecting pipe 493 communicating with the inner cavity of the lower frame plate 432 is provided on one side of the second nozzle 492. The horizontal angle of the spraying direction of the second nozzle 492 matches the taper of the conical surface 51 and the conical groove bottom 21. The first shaft rod 481 is driven to rotate 180 degrees by the second driving motor 47, and the second shaft rod 461 is also driven to rotate 180 degrees by the meshing of the first bevel gear 482 and the second bevel gear 462. The cleaning mechanism 4 remains as shown in the figure. Figure 5 In the second state shown, the first nozzles 441 of the two first cleaning nozzles 44 are facing the circumferential inner wall of the flow groove 2, and the inclination direction of the second nozzle 492 of the second cleaning nozzle 49 corresponds to the taper of the conical groove bottom 21.

[0053] It should be noted that 1. The working module 3 includes a 24V power supply 32, and a filter 31 and a relay 33 electrically connected to the 24V power supply 32. The instrument is powered by 220V AC power. The filter 31 is used to filter out the interference signal of the 220V AC power to improve the power supply stability of the instrument. The 24V power supply 32 can convert the 220V AC power into direct current, which is used to power the pH electrode 5, the relay 33 and the four pump groups; the relay 33 is controlled by the pH display controller 10 to output a switch signal to control the working state of each pump.

[0054] Further, the acid adding pump group 6 in the present invention includes an acid adding pipe 61, on which an acid adding pump 62 is arranged; the water inlet pump group 7 includes a water sample inlet pipe 71, on which a water sample inlet pump 72 is arranged; the drainage pump group 8 includes a drainage pipe 81, on which a drainage electric valve 82 and a drainage manual valve 83 are arranged, and the drainage pipe 81 is communicated with the annular bottom cavity 22. Since the dirt flushed down from the conical groove bottom 21 is discharged through the annular bottom cavity 22, the drainage pipe 81 is connected to an overflow pipe 84 leading to the inner cavity of the circulation groove 2, and an overflow manual valve 85 is arranged on the overflow pipe 84; the tap water pump group 9 includes a tap water inlet pipe 91, on which a tap water inlet pump 92 and a tap water inlet manual valve 93 are arranged.

[0055] In the present invention, when the measuring state is in progress, the water sample pump 72 is turned on, and other water pumps are turned off. The water sample from the neutralization reaction tank flows from the water sample inlet 11 to the water sample pump 72, flows to the flow tank 2, and is discharged from the overflow pipe 84 in the flow tank 2. The pH electrode 5 is fixedly installed inside the cavity of the flow tank 2 to measure the pH value of the water sample.

[0056] When the present invention is in the cleaning state, the inlet tap water pump 92 is turned on and other water pumps are turned off. The tap water flows from the tap water inlet 13, through the tap water hand valve 93 and the tap water pump 92 to the water distribution plate 41 of the cleaning mechanism 4, and then through the water distribution plate 41 to the upper frame plate 431 and the lower frame plate 432, and then through the two first cleaning nozzles 44 and the second cleaning nozzle 49 to rinse the pH electrode 5, and the sewage after cleaning flows out from the drain pipe 81;

[0057] When the present invention is in the acid-adding soaking state, the acid-adding pump 62 is first opened to extract citric acid into the circulation tank 2. After the inner cavity of the circulation tank 2 is filled with citric acid, the acid-adding pump 62 is closed. At this time, all pumps are closed, and the pH electrode 5 in the inner cavity of the circulation tank 2 is immersed in citric acid to achieve acid immersion. After the immersion is completed, the drainage electric valve 82 is opened to drain the citric acid in the inner cavity of the circulation tank 2.

[0058] See also Fig.16 In the display interface of the pH display controller 10 of the present invention, "drainage time" is the duration of drainage when executing the drainage step, and no measurement is made during this time period; "tap water inlet time" is the water inlet time when executing the tap water inlet step, and no measurement is made during this time period; "number of flushing times" is the number of repeated cleaning times when executing the tap water cleaning function; "water sample inlet time" is the time for water sample inlet when executing the measurement function, and no measurement is made during this time period; "acid solution inlet time" is the time for acid solution inlet when executing the acid soaking function, and no measurement is made during this time period; "soaking time" is the time for soaking when executing the acid soaking function, and no measurement is made during this time period.

[0059] The working principle and use process of the present invention are as follows: During flushing, the cleaning mechanism 4 is kept as follows: Figure 4In the first state shown, the first nozzles 441 of the two first cleaning nozzles 44 are facing the circumferential outer wall of the pH electrode 5, and the inclination direction of the second nozzle 492 of the second cleaning nozzle 49 corresponds to the taper of the conical surface 51. The first driving motor 42 is turned on while the tap water pump 92 is turned on, and the spur gear 421 is driven by the first driving motor 42 to rotate. Through the meshing of the spur gear 421 and the annular gear 416, the water separation plate 41 is driven to rotate around the outer circumference of the pH electrode 5, and then the two first cleaning nozzles 44 and the second cleaning nozzle 49 on the cleaning bracket 43 are driven to rotate synchronously;

[0060] During the circumferential rotation of the cleaning bracket 43 around the pH electrode 5, the pressure head 454 is always in contact with the second annular protrusion 414 on the outer wall of the inner bottom ring 412 by the elastic force of the spring 455. Under the continuous squeezing of the second annular protrusion 414 and the elastic force of the spring 455, the slider 451 can slide back and forth on the slide bar 484, and then the first nozzle 441 at the upper part is driven to swing back and forth through the meshing of the rack 453 and the second sector teeth 445. The first sector teeth 444 on the two first nozzles 441 are meshed with each other, so that the first nozzle 441 at the lower part swings back and forth relative to the first nozzle 441 at the upper part. That is, during the circumferential rotation of the two first nozzles 441 around the pH electrode 5, the pH electrode 5 can be rinsed by reciprocating cross-swing. During the circumferential rotation of the second cleaning nozzle 49 around the pH electrode 5, the conical rinsing surface can be formed by the second nozzle 492 to perform covering rotational rinsing on the conical surface 51.

[0061] Then, the second drive motor 47 drives the first shaft 481 to rotate 180 degrees, and the first bevel gear 482 and the second bevel gear 462 are meshed to drive the second shaft 461 to rotate 180 degrees. The cleaning mechanism 4 remains as shown in FIG. Figure 5 In the second state shown, the first nozzles 441 of the two first cleaning nozzles 44 are facing the circumferential inner wall of the circulation groove 2, and the inclination direction of the second nozzle 492 of the second cleaning nozzle 49 corresponds to the taper of the conical groove bottom 21. Then the above-mentioned flushing steps are repeated, that is, the two first nozzles 441 can perform reciprocating cross-swing flushing on the inner wall of the circulation groove 2 during the circumferential rotation in the circulation groove 2, and the second cleaning nozzle 49 can form a conical flushing surface by the second nozzle 492 during the circumferential rotation in the circulation groove 2 to perform covering rotation flushing on the conical groove bottom 21.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online pH detection and automatic cleaning instrument, comprising a housing (1), a pH display controller (10) and a working module (3) arranged in the housing (1), characterized in that: A circulation groove (2) is fixed in the box (1), a pH electrode (5) is fixed on the inner side of the top of the circulation groove (2), a water sample inlet (11), an acid liquid inlet (12), a tap water inlet (13) and a water outlet (14) are arranged on the outer side of the box (1), and an acid adding pump group (6) for injecting acid into the circulation groove (2) through the acid liquid inlet (12), a water inlet pump group (7) for injecting water sample into the circulation groove (2) through the water sample inlet (11), a tap water pump group (9) for injecting cleaning water into the circulation groove (2) through the tap water inlet (13), and a drainage pump group (8) for discharging the sewage cleaned in the circulation groove (2); The bottom of the pH electrode (5) is provided with a conical surface (51), the diameter of which gradually decreases from top to bottom; the bottom inner wall of the flow groove (2) is provided with a conical groove bottom (21), the diameter of which gradually increases from top to bottom; the bottom of the flow groove (2) is located at the periphery of the conical groove bottom (21) to form an annular bottom cavity (22); A cleaning mechanism (4) is arranged in the circulation groove (2), and the cleaning mechanism (4) comprises a water separation plate (41), the water separation plate (41) is rotatably connected to the top inner wall of the circulation groove (2), the water outlet end of the tap water pump group (9) leads to the water separation plate (41), a first driving motor (42) is fixed to the top outer wall of the circulation groove (2) for driving the water separation plate (41) to rotate relative to the pH electrode (5), a cleaning bracket (43) is fixed to one side of the bottom of the water separation plate (41), the cleaning bracket (43) is L-shaped, and a first rotating member (48) is arranged on the upper half of the cleaning bracket (43), and two first cleaning nozzles are arranged on the first rotating member (48) for rotating and washing the circumferential outer wall of the pH electrode (5) or the circumferential inner wall of the circulation groove (2) (44), a second driving motor (47) is fixed inside the cleaning mechanism (4) for driving the first rotating member (48) to rotate and adjust the flushing direction of the two first cleaning nozzles (44), a second rotating member (46) is arranged on the lower half of the cleaning bracket (43), a second cleaning nozzle (49) is arranged on the second rotating member (46) for rotating and flushing the conical surface (51) or the conical groove bottom (21), the second rotating member (46) can adjust the flushing direction of the second cleaning nozzle (49) under the transmission drive of the first rotating member (48), and an elastic pressure member (45) is arranged on the inner side of the top of the cleaning bracket (43) for driving the two first cleaning nozzles (44) to cross-swing in cooperation with the water separation plate (41) when rotating around the pH electrode (5).

2. The online pH detection and automatic cleaning instrument according to claim 1, characterized in that: The bottom of the water separation plate (41) is provided with an outer bottom ring (411) and an inner bottom ring (412) located inside the outer bottom ring (411); a plurality of first arc-shaped protrusions (413) are circumferentially arranged at intervals on the inner wall of the outer bottom ring (411); a plurality of second annular protrusions (414) are circumferentially arranged at intervals on the outer wall of the inner bottom ring (412); a top ring (415) is provided at the top of the water separation plate (41); annular teeth (416) are provided on the inner wall of the top ring (415); a spur gear (421) is fixed to the output end of the first drive motor (42); the spur gear (421) is meshed with the annular teeth (416).

3. The online pH detection and automatic cleaning instrument according to claim 2, characterized in that: The cleaning bracket (43) comprises an upper frame plate (431) and a lower frame plate (432) vertically fixed to the upper frame plate (431); the upper frame plate (431) and the lower frame plate (432) are both hollow structures and communicate with the inner cavity of the water distribution tray (41).

4. The online pH detection and automatic cleaning instrument according to claim 3, characterized in that: The first rotating member (48) comprises a first shaft (481), the first shaft (481) is rotatably connected to the upper frame plate (431), the top of the first shaft (481) passes through the water distribution plate (41) and is fixedly connected to the output end of the second drive motor (47), a first bevel gear (482) is fixed to the bottom of the first shaft (481), and a movable groove (483) for the two first cleaning nozzles (44) to swing up and down is formed on the first shaft (481), and a slide bar (484) for slidingly guiding the elastic pressure member (45) is fixed to the inner side of the top of the movable groove (483).

5. The online pH detection and automatic cleaning instrument according to claim 4, characterized in that: The two first cleaning nozzles (44) each include a first nozzle (441), the two first nozzles (441) are respectively hinged in a movable groove (483) via a rotating shaft (442), the two first nozzles (441) are respectively communicated with the inner cavity of the upper frame plate (431) via a first connecting pipe (443), the two first nozzles (441) are fixed with first sector-shaped teeth (444) that mesh with each other, and the first nozzle (441) located at the upper part is fixed with second sector-shaped teeth (445).

6. The online pH detection and automatic cleaning instrument according to claim 5, characterized in that: The elastic pressure piece (45) comprises a slider (451), a limiting groove (452) slidably connected to the slide bar (484) is provided on the slider (451), a rack (453) meshing with the second sector tooth (445) is fixed at the bottom of the slider (451), the slider (451) is elastically connected to the first shaft (481) via a spring (455), and a pressure head (454) is provided at one end of the slider (451) which contacts the first arc-shaped protrusion (413) or the second annular protrusion (414) under the elastic force of the spring (455).

7. The online pH detection and automatic cleaning instrument according to claim 6, characterized in that: The second rotating member (46) comprises a second shaft (461), the second shaft (461) is rotatably connected to the lower frame plate (432), and a second bevel gear (462) meshing with the first bevel gear (482) is fixed to one end of the second shaft (461).

8. The online pH detection and automatic cleaning instrument according to claim 7, characterized in that: The second cleaning nozzle (49) includes a base (491), the base (491) is fixed on the second shaft (461), a second nozzle (492) is fixed on the base (491), a second connecting pipe (493) communicating with the inner cavity of the lower frame plate (432) is provided on one side of the second nozzle (492), and the horizontal angle of the spraying direction of the second nozzle (492) matches the taper of the conical surface (51) and the conical groove bottom (21).

9. The online pH detection and automatic cleaning instrument according to claim 1, characterized in that: The working module (3) comprises a 24V power supply (32), and a filter (31) and a relay (33) electrically connected to the 24V power supply (32).

10. The online pH detection and automatic cleaning instrument according to claim 1, characterized in that: The acid adding pump group (6) comprises an acid adding pipe (61), and the acid adding pipe (61) is provided with an acid adding pump (62); The water inlet pump group (7) comprises a water sample inlet pipe (71), and a water sample inlet pump (72) is arranged on the water sample inlet pipe (71); The drainage pump group (8) comprises a drainage pipe (81), on which a drainage electric valve (82) and a drainage manual valve (83) are arranged, and the drainage pipe (81) is connected to an overflow pipe (84) leading to the inner cavity of the flow groove (2), and the overflow pipe (84) is provided with an overflow manual valve (85); The tap water pump assembly (9) comprises a tap water inlet pipe (91), and the tap water inlet pipe (91) is provided with a tap water inlet pump (92) and a tap water inlet manual valve (93).

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