Automatic potentiometric titrator calibration device and calibration method thereof

Abstract

The invention relates to the technical field of automatic potentiometric titrators, in particular to an automatic potentiometric titrator calibration device which comprises a bottom plate, a magnetic stirrer fixedly connected to the left side of the front end of the top of the bottom plate, a sliding rail fixedly connected to the top of a rotating disc, a limiting round block fixedly connected to the top of the sliding rail, and an electric sliding table arranged on the outer side of the sliding rail in a sleeving mode. The front end of the electric sliding table is fixedly connected with a connecting rod, the front end of the connecting rod is fixedly connected with a clamping seat, the top of the clamping seat is in clamping connection with a burette and an electrode probe, and a cleaning device is arranged at the rear end of the right side of the top of the bottom plate and comprises a collecting assembly and a cleaning assembly. The automatic potentiometric titrator burette calibration device has the advantages that the calibration efficiency of the burette is improved, the time and energy spent by workers before calibration are reduced, the precision of the calibrated burette of the automatic potentiometric titrator is further improved, and the data is accurate and reliable.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of automatic potentiometric titrators, and specifically provides an automatic potentiometric titrator calibration device and a calibration method therefor. Background Art

[0002] An automatic potentiometric titrator is an analytical instrument used for volumetric analysis. It is a precision instrument widely used in the field of chemical analysis, mainly for accurately determining substances with uncertain content in a solution. It determines the concentration of the target substance in the test solution by adding a reagent with a known concentration to the test solution through titration. In actual use, to ensure the accuracy and reliability of the measurement results, the automatic potentiometric titrator needs to be calibrated and metrologically detected. There are usually two methods for calibrating an automatic potentiometric titrator: one is to calibrate it using a standard solution, and the other is to calibrate it using a solution with a known concentration. The standard solution is generally provided by a national or international standard agency and has an accurate concentration value. By titrating the standard solution, the titration volume and response value of the automatic potentiometric titrator can be determined, thereby performing accurate calibration. In addition, a solution with a known concentration can also be used for calibration. The method is to first determine its concentration using other accurate analytical methods, and then use the automatic potentiometric titrator for titration, and correct the titration volume and response value of the automatic potentiometric titrator according to the titration results. The metrological detection of an automatic potentiometric titrator refers to titrating a solution with a known concentration, measuring the titration volume, and calculating the concentration of the target substance in the test solution.

[0003] However, the burette in an automatic potentiometric titrator is a special burette, which is fixedly installed in the instrument and is not easy to be disassembled for calibration during use. For some precise chemical analysis experiments, the slight error of the burette will have a great impact on the calibration result. It is very difficult to ensure the accuracy of the calibration result when using an uncalibrated burette. At the same time, in the prior art, when calibrating the burette, it is necessary to manually clean the burette, and the operation is complex, which affects the calibration efficiency. Therefore, when conducting such precise chemical analysis experiments, it is necessary to calibrate the burette in the automatic potentiometric titrator. Based on this, the present invention proposes an automatic potentiometric titrator calibration device and a calibration method therefor. Summary of the Invention

[0004] The present invention mainly provides an automatic potentiometric titrator calibration device and a calibration method therefor, so as to solve the technical problems raised in the above background art.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] An automatic potentiometric titrator calibration device includes a bottom plate. On the left front end of the top of the bottom plate, a magnetic stirrer is fixedly connected. On the top of the magnetic stirrer, a stirring seat is fixedly connected. On the top of the stirring seat, a standard substance container is provided. On the left rear end of the top of the bottom plate, a driving box is fixedly connected. At the bottom end inside the driving box, a stepping motor is fixedly connected. At the top of the driving box, a rotating disk is rotatably connected. On the top of the rotating disk, a slide rail is fixedly connected. On the top of the slide rail, a limiting circular block is fixedly connected. Outside the slide rail, an electric slide is sleeved. At the front end of the electric slide, a connecting rod is fixedly connected. At the front end of the connecting rod, a clamping seat is fixedly connected. On the top of the clamping seat, a burette and an electrode probe are clamped and connected. On the right rear end of the top of the bottom plate, a cleaning device is provided. The cleaning device includes a collection component and a cleaning component.

[0007] Further, the collection component includes a collection box fixedly connected to the right rear end of the top of the bottom plate. At the top of the collection box, a communication port is fixedly opened. At the front end of the collection box, a slot is fixedly opened. On both sides inside the slot, a chute is fixedly opened. Inside the slot, a collection drawer is provided. At the front end of the collection drawer, a baffle is fixedly connected. At the front end of the baffle, a hand-pulling plate is fixedly connected. On both sides of the collection drawer, slide rods are fixedly connected.

[0008] Further, the collection drawer is slidably connected to the chutes opened on both sides inside the slot through the slide rods provided on both sides, and a sealing ring is provided at the contact position between the baffle and the front end of the collection box.

[0009] Further, the cleaning component includes a cleaning basin fixedly connected to the top of the collection box. At the top of the cleaning basin, a cleaning groove is fixedly opened. At the bottom end inside the cleaning groove, a number of water leakage holes are fixedly opened and arranged at equal intervals in a line. On the top of both the front and rear sides of the cleaning basin, fixing plates are fixedly connected. On the top of both fixing plates, vertical plates are fixedly connected. On the far side of both vertical plates, electric push rods are fixedly connected. On the opposite side of both vertical plates, pressure sensors are provided. On the opposite side of both pressure sensors, wiping plates are fixedly connected. On the opposite side of both wiping plates, non-woven fabrics are adhesively connected.

[0010] Further, the cleaning groove is communicated with the communication port opened at the top of the collection box through a number of water leakage holes opened at the bottom.

[0011] Further, the pressure sensor is fixedly connected to the output end of the electric push rod, and both the pressure sensor and the electric push rod are electrically connected to the main body of the automatic potentiometric titrator.

[0012] Further, foot pads are fixedly connected to the four corners at the bottom of the bottom plate. A support plate is fixedly connected to the rear end on the right side of the bottom plate. A placement groove is fixedly formed at the top of the support plate. An ionized water filling bottle is arranged inside the placement groove. A micro water pump is fixedly connected to the top of the ionized water filling bottle. The top of the output end of the micro water pump is fixedly connected to a flushing pipe. An electric control valve is fixedly sleeved outside the flushing pipe.

[0013] Further, the position of the output end of the flushing pipe corresponds to the position of the cleaning assembly, and both the micro water pump and the electric control valve are electrically connected to the main body of the automatic potentiometric titrator.

[0014] Further, the bottom of the rotating disk is fixedly connected to the output end of the stepping motor. The electric sliding table is slidably connected to the outside of the slide rail. The positions of the burettes correspond to the positions of the standard substance containers and the cleaning assembly respectively, and both the stepping motor and the electric sliding table are electrically connected to the main body of the automatic potentiometric titrator.

[0015] A method for calibrating an automatic potentiometric titrator by applying the above device, the method comprising the steps:

[0016] S1. Boot preparation: First, turn on the main body of the automatic potentiometric titrator and wait for the display page of the main body to stabilize. Then, determine the electrodes required according to the experiment and install the electrodes. Check the titration flask, fill it with the required titrant, and then select the corresponding operation page. Select the calibration of the burette through the display screen of the main body.

[0017] S2. Burette cleaning: After the calibration operation starts, the stepping motor is started and controls the rotating disk to rotate 90 degrees. At this time, the burette is exactly above the cleaning basin. Then, start the electric sliding table to drive the clamping seat to move downwards so that the burette is exactly inside the cleaning tank. Then, open the electric control valve and start the micro water pump to extract the ionized water inside the ionized water filling bottle and spray it on the burette to clean the burette. The ionized water generated during cleaning falls into the collection assembly through the water leakage holes.

[0018] S3. Burette wiping: After the burette cleaning is completed, two electric push rods push the two wiping plates to move inwards so that the non-woven fabric fits against the front and back sides of the burette. When the pressure sensor shows a pressure value jump, the electric push rod immediately stops to prevent damage to the burette caused by excessive pressure. Then, the electric sliding table drives the clamping seat to move upwards. At this time, the set non-woven fabric can clean the ionized water adhering to the burette.

[0019] S4. Burette calibration: After the burette cleaning is completed, the position of the burette returns to the starting position. At this time, the staff adds the standard solution to the standard substance container. Then, the electric sliding table drives the clamping seat to move downwards so that the burette is placed in the standard substance container, and the liquid level must submerge the burette and the electrode probe to perform the calibration work of the burette.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] Through the provided cleaning device, the device and method of the present invention bid farewell to the traditional manual cleaning method, realizing the automatic cleaning and wiping of burettes, and collecting the generated deionized water, thereby improving the calibration efficiency of burettes, reducing the time and effort spent by staff before calibration, further improving the accuracy of the burettes of the automatic potentiometric titrator after calibration, and making the data accurate and reliable.

[0022] The following will combine the accompanying drawings and specific embodiments to explain the present invention in detail. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the present invention;

[0024] Figure 2 is the overall structural schematic diagram of the cleaning device of the present invention;

[0025] Figure 3 is the split structural schematic diagram of the collection component of the present invention;

[0026] Figure 4 is the structural schematic diagram of the pressing and clamping ejector rod of the present invention;

[0027] Figure 5 is Figure 4 the enlarged view of area A in;

[0028] Figure 6 is the front internal structural schematic diagram of the drive box of the present invention.

[0029] In the figure: 1. bottom plate; 101. foot pad; 102. support plate; 103. placement groove; 104. deionized water filling bottle; 105. micro water pump; 106. flushing pipe; 107. electric control valve; 2. magnetic stirrer; 201. stirring seat; 202. standard substance vessel; 3. drive box; 301. stepping motor; 302. rotating disk; 303. slide rail; 304. limiting round block; 305. electric slide table; 306. connecting rod; 307. clamping seat; 308. burette; 309. electrode probe; 4. cleaning device; 5. collection component; 501. collection box; 502. communication port; 503. slot; 504. chute; 505. collection drawer; 506. slide rod; 507. baffle; 508. hand pulling plate; 6. cleaning component; 601. cleaning basin; 602. cleaning tank; 603. water leakage hole; 604. fixing plate; 605. vertical plate; 606. electric push rod; 607. pressure sensor; 608. wiping plate; 609. non-woven fabric. Detailed Embodiments

[0030] For ease of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0031] For the embodiments, please refer to the attached Figures 1-6 As shown, an automatic potentiometric titrator calibration device includes a bottom plate 1. On the left side of the front end of the top of the bottom plate 1, a magnetic stirrer 2 is fixedly connected. On the top of the magnetic stirrer 2, a stirring seat 201 is fixedly connected. On the top of the stirring seat 201, a standard substance container 202 is provided. On the left side of the rear end of the top of the bottom plate 1, a drive box 3 is fixedly connected. At the bottom end inside the drive box 3, a stepping motor 301 is fixedly connected. At the top end of the drive box 3, a rotating disk 302 is rotatably connected. On the top of the rotating disk 302, a slide rail 303 is fixedly connected. On the top of the slide rail 303, a limiting circular block 304 is fixedly connected. An electric slide 305 is sleeved outside the slide rail 303. At the front end of the electric slide 305, a connecting rod 306 is fixedly connected. At the front end of the connecting rod 306, a clamping seat 307 is fixedly connected. On the top of the clamping seat 307, a burette 308 and an electrode probe 309 are clamped and connected. On the right side of the rear end of the top of the bottom plate 1, a cleaning device 4 is provided. The cleaning device 4 includes a collection component 5 and a cleaning component 6.

[0032] Among them, the cleaning component 6 includes a cleaning basin 601 fixedly connected to the top of the collection box 501. A cleaning groove 602 is fixedly opened at the top end of the cleaning basin 601. A number of water leakage holes 603 arranged at equal intervals in a line are fixedly opened at the bottom end inside the cleaning groove 602. Fixing plates 604 are fixedly connected to the top of both the front and rear sides of the cleaning basin 601. Vertical plates 605 are fixedly connected to the top of the two fixing plates 604. Electric push rods 606 are fixedly connected to the sides of the two vertical plates 605 away from each other. Pressure sensors 607 are arranged on the opposite sides of the two vertical plates 605. Wiping plates 608 are fixedly connected to the opposite sides of the two pressure sensors 607. Non-woven fabrics 609 are attached to the opposite sides of the two wiping plates 608. The cleaning groove 602 is communicated with the communication port 502 opened at the top end of the collection box 501 through a number of water leakage holes 603 opened at the bottom. The pressure sensor 607 is fixedly connected to the output end of the electric push rod 606, and both the pressure sensor 607 and the electric push rod 606 are electrically connected to the main body of the automatic potentiometric titrator. The stepping motor 301 is started, and the rotating disk 302 is controlled to rotate by 90 degrees. At this time, the burette 308 is exactly located directly above the cleaning basin 601. Then, the electric sliding table 305 is started to drive the clamping seat 307 to move downward, so that the burette 308 is exactly located inside the cleaning groove 602. Then, the electric control valve 107 is opened and the micro water pump 105 is started to extract the deionized water inside the deionized water filling bottle 104 and spray it on the burette 308 to clean the burette 308. The deionized water generated during cleaning falls into the collection component 5 through the water leakage holes 603.

[0033] Among them, the collection component 5 includes a collection box 501 fixedly connected to the rear end of the right side of the top of the bottom plate 1. A communication port 502 is fixedly opened at the top end of the collection box 501. A slot 503 is fixedly opened at the front end of the collection box 501. Slide grooves 504 are fixedly opened on both sides inside the slot 503. A collection drawer 505 is arranged inside the slot 503. A baffle 507 is fixedly connected to the front end of the collection drawer 505. A hand-pulling plate 508 is fixedly connected to the front end of the baffle 507. Slide rods 506 are fixedly connected to both sides of the collection drawer 505. The collection drawer 505 is slidably connected to the slide grooves 504 opened on both sides inside the slot 503 through the slide rods 506 arranged on both sides, and a sealing ring is arranged at the contact position between the baffle 507 and the front end of the collection box 501. The arranged collection drawer 505 can collect the deionized water waste generated during cleaning, so that the waste water is centrally collected in the collection drawer 505. After the automatic potentiometric titrator is used for a period of time, the staff can pull out the collection drawer 505 through the hand-pulling plate 508 to clean the deionized water waste collected therein, which brings convenience to the staff.

[0034] Among them, four corner parts at the bottom of the bottom plate 1 are fixedly connected with foot pads 101, the rear end on the right side of the bottom plate 1 is fixedly connected with a support plate 102, a placement groove 103 is fixedly opened at the top of the support plate 102, a deionized water filling bottle 104 is arranged inside the placement groove 103, a micro water pump 105 is fixedly connected to the top of the deionized water filling bottle 104, a flushing pipe 106 is fixedly connected to the top of the output end of the micro water pump 105, an electric control valve 107 is fixedly sleeved outside the flushing pipe 106, the position of the output end of the flushing pipe 106 corresponds to the position of the cleaning assembly 6, and both the micro water pump 105 and the electric control valve 107 are electrically connected to the automatic potentiometric titrator main unit. Open the electric control valve 107 and start the micro water pump 105 to extract the deionized water inside the deionized water filling bottle 104 and spray it on the burette 308 to clean the burette 308.

[0035] Among them, the bottom of the rotating disk 302 is fixedly connected to the output end of the stepping motor 301, the electric sliding table 305 is slidably connected to the outside of the slide rail 303, the positions of the burettes 308 respectively correspond to the positions of the standard substance containers 202 and the cleaning assembly 6, and both the stepping motor 301 and the electric sliding table 305 are electrically connected to the automatic potentiometric titrator main unit. When the stepping motor 301 is started, the position of the burette 308 can be changed.

[0036] On the other hand, the present invention also proposes a method for calibrating an automatic potentiometric titrator by applying the above device. The method includes the steps:

[0037] S1. Boot preparation: First, turn on the main unit of the automatic potentiometric titrator and wait for the display page of the main unit to stabilize. Then, according to the experiment, determine the required electrodes, install the electrodes, check the titration flask, fill it with the required titrant, and then select the corresponding operation page. Select the calibration of the burette 308 through the main unit display screen.

[0038] S2. Burette cleaning: After the calibration operation starts, the stepping motor 301 is started and controls the rotating disk 302 to rotate 90 degrees. At this time, the burette 308 is exactly above the cleaning basin 601. Then, start the electric sliding table 305 to drive the clamping seat 307 to move downward so that the burette 308 is exactly inside the cleaning tank 602. Then, open the electric control valve 107 and start the micro water pump 105 to extract the deionized water inside the deionized water filling bottle 104 and spray it on the burette 308 to clean the burette 308. The deionized water generated during cleaning falls into the collection assembly 5 through the water leakage holes 603.

[0039] S3. Burette wiping: After the burette 308 is cleaned, two electric push rods 606 push two wiping plates 608 to move inwards, so that the non-woven fabric 609 fits against the front and back sides of the burette 308. When the pressure value detected by the pressure sensor 607 fluctuates, the electric push rod 606 immediately stops to prevent damage to the burette 308 caused by excessive pressure. Then, the electric slide table 305 drives the clamping seat 307 to move upwards. At this time, the set non-woven fabric 609 can clean the deionized water adhering to the burette 308.

[0040] S4. Burette calibration: After the burette 308 is cleaned, the position of the burette 308 returns to the starting position. At this time, the staff adds the standard solution into the standard substance container 202, and then the electric slide table 305 drives the clamping seat 307 to move downwards, so that the burette 308 is placed in the standard substance container 202, and the liquid level must submerge the burette 308 and the electrode probe 309 to perform the calibration work of the burette 308.

[0041] The following uses two groups of experiments to illustrate the embodiments of the present invention:

[0042] Under the same laboratory conditions, the burettes of two different automatic potentiometric titrators are calibrated, and the experimental results of the metrological performance of the automatic potentiometric titrators (electrometer indication error, electrometer indication repeatability, electrometer input impedance, electrometer input current, burette volume error, instrument indication error and repeatability) are as follows respectively.

[0043] (1). Leici ZDJ-4B, 10 mL burette (±0.025 mL), mV value (-1800~1800) mV, 0.1 mV. Platinum electrode and single-salt bridge reference electrode.

[0044] Temperature: 21.3 °C, Humidity: 64% RH.

[0045] Electrometer indication error full-scale potential value: 1800 mV

[0046]

[0047]

[0048] Electrometer indication repeatability

[0049]

[0050]

[0051] Electrometer input impedance

[0052]

[0053] Electrometer input current

[0054]

[0055] Burette volume error

[0056]

[0057] Instrument indication error and repeatability

[0058]

[0059] (2) Metrohm 916 automatic potentiometric titrator, 20 mL burette, mV value (-2000~2000) mV, 0.1 mV. Platinum electrode and single-salt bridge reference electrode.

[0060] Temperature: 20.0 °C, Humidity: 68% RH.

[0061] Electrometer indication error full-scale potential value: 2000 mV

[0062]

[0063]

[0064]

[0065] Electrometer indication repeatability

[0066]

[0067] Electrometer input impedance

[0068]

[0069]

[0070] Electrometer input current

[0071]

[0072] Burette volume error

[0073] Instrument indication error and repeatability

[0074]

[0075] Using this calibration method, experiments were conducted on the metrological performance of the automatic potentiometric titrator (electrometer indication error, electrometer indication repeatability, electrometer input impedance, electrometer input current, burette volume error, instrument indication error and repeatability). From the experimental results, it can be seen that the above calibration methods all meet the metrological performance requirements in the calibration specification, and at the same time, it can also verify that the test methods specified in the calibration specification are scientific and reasonable.

[0076] The above description of the present invention with reference to the accompanying drawings is exemplary. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as this non-substantial improvement is made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An automatic potentiometric titrator calibration device, characterized in that: The invention comprises a bottom plate (1), wherein a magnetic stirrer (2) is fixedly connected to the left side of the top front end of the bottom plate (1), a stirring seat (201) is fixedly connected to the top of the magnetic stirrer (2), a standard material container (202) is arranged on the top of the stirring seat (201), a driving box (3) is fixedly connected to the left side of the top rear end of the bottom plate (1), a stepping motor (301) is fixedly connected to the bottom end of the driving box (3), a rotating disk (302) is rotatably connected to the top of the driving box (3), and a slide rail (303) is fixedly connected to the top of the rotating disk (302). The top of the slide rail (303) is fixedly connected to a limited circular block (304), the outer side of the slide rail (303) is sleeved with an electric slide (305), the front end of the electric slide (305) is fixedly connected to a connecting rod (306), the front end of the connecting rod (306) is fixedly connected to a clamping seat (307), the top of the clamping seat (307) is clamped and connected to a burette (308) and an electrode probe (309), and a cleaning device (4) is provided at the right rear end of the top of the bottom plate (1), and the cleaning device (4) includes a collecting component (5) and a cleaning component (6).

2. An automatic potentiometric titrator calibration device according to claim 1, characterized in that: The collecting assembly (5) comprises a collecting box (501) fixedly connected to the right rear end of the top of the bottom plate (1); a connecting port (502) is fixedly provided at the top of the collecting box (501); a slot (503) is fixedly provided at the front end of the collecting box (501); sliding slots (504) are fixedly provided on both sides of the slot (503); a collecting drawer (505) is provided inside the slot (503); a baffle (507) is fixedly connected to the front end of the collecting drawer (505); a hand-pull plate (508) is fixedly connected to the front end of the baffle (507); and sliding rods (506) are fixedly connected to both sides of the collecting drawer (505).

3. An automatic potentiometric titrator calibration device according to claim 2, characterized in that: The collecting drawer (505) is slidably connected to the sliding grooves (504) provided on both sides of the slot (503) through the sliding rods (506) provided on both sides, and a sealing ring is provided at the contact point between the baffle (507) and the front end of the collecting box (501).

4. An automatic potentiometric titrator calibration device according to claim 2, characterized in that: The cleaning component (6) comprises a cleaning basin (601) fixedly connected to the top of the collection box (501); a cleaning groove (602) is fixedly opened at the top of the cleaning basin (601); a plurality of water leakage holes (603) are fixedly opened at the bottom of the cleaning groove (602) and are distributed in a straight line; a fixing plate (604) is fixedly connected to the top of both front and rear sides of the cleaning basin (601); a vertical plate (605) is fixedly connected to the top of both the fixing plates (604); an electric push rod (606) is fixedly connected to the two vertical plates (605) on the side away from each other; a pressure sensor (607) is provided on the opposite side of the two vertical plates (605); a wiping plate (608) is fixedly connected to the opposite side of the two pressure sensors (607); and a non-woven fabric (609) is bonded to the opposite side of the two wiping plates (608).

5. An automatic potentiometric titrator calibration device according to claim 4, characterized in that: The cleaning tank (602) is connected to the connecting port (502) opened at the top of the collection box (501) through a plurality of water leakage holes (603) opened at the bottom.

6. An automatic potentiometric titrator calibration device according to claim 4, characterized in that: The pressure sensor (607) is fixedly connected to the output end of the electric push rod (606), and both the pressure sensor (607) and the electric push rod (606) are electrically connected to the main unit of the automatic potentiometric titrator.

7. An automatic potentiometric titrator calibration device according to claim 1, characterized in that: Foot pads (101) are fixedly connected at the four corners of the bottom of the base plate (1), a support plate (102) is fixedly connected at the rear end of the right side of the base plate (1), a placement groove (103) is fixedly provided at the top of the support plate (102), a deionized water filling bottle (104) is arranged inside the placement groove (103), a micro water pump (105) is fixedly connected to the top of the deionized water filling bottle (104), a flushing pipe (106) is fixedly connected to the top of the output end of the micro water pump (105), and an electric control valve (107) is fixedly sleeved on the outside of the flushing pipe (106).

8. An automatic potentiometric titrator calibration device according to claim 7, characterized in that: The position of the output end of the flushing tube (106) corresponds to the position of the cleaning component (6), and the micro water pump (105) and the electric control valve (107) are both electrically connected to the main unit of the automatic potentiometric titrator.

9. The automatic potentiometric titrator calibration device according to claim 1, characterized in that: The bottom of the rotating disk (302) is fixedly connected to the output end of the stepper motor (301), the electric slide (305) is slidably connected to the outer side of the slide rail (303), the position of the burette (308) corresponds to the position of the standard material vessel (202) and the cleaning component (6), and the stepper motor (301) and the electric slide (305) are both electrically connected to the main machine of the automatic potentiometric titrator.

10. A method for calibrating an automatic potentiometric titrator using the device according to any one of claims 1 to 9, characterized in that: The method comprises the steps of: S1, power-on preparation: first, turn on the main unit of the automatic potentiometric titrator, wait for the main unit display page to stabilize, then determine the required electrode according to the test, install the electrode, check the titration bottle, fill it with the required titration solution, then select the corresponding operation page, and select the calibration of the burette (308) through the main unit display screen; S2, burette cleaning: After the calibration operation starts, the stepper motor (301) is started and controls the rotating disk (302) to rotate ninety degrees. At this time, the burette (308) is located just above the cleaning basin (601). Then the electric slide (305) is started to drive the clamping seat (307) to move downward, so that the burette (308) is located just inside the cleaning tank (602). Then the electric control valve (107) is opened and the micro water pump (105) is started to extract the deionized water inside the deionized water filling bottle (104) and spray it on the burette (308) to clean the burette (308). The deionized water generated during the cleaning falls into the collecting component (5) through the water leakage hole (603); S3, burette wiping: After the burette (308) is cleaned, the two electric push rods (606) push the two wiping plates (608) to move inward, so that the non-woven fabric (609) fits the front and back sides of the burette (308). When the pressure value of the pressure sensor (607) jumps, the electric push rod (606) stops immediately to prevent the burette (308) from being damaged due to excessive pressure. Then the electric slide (305) drives the card seat (307) to move upward. At this time, the non-woven fabric (609) can clean the deionized water adhering to the burette (308); S4. Calibration of burette: After the cleaning of the burette (308) is completed, the position of the burette (308) returns to the starting position. At this time, the staff adds the standard solution into the standard material vessel (202), and then the electric slide (305) drives the clamping seat (307) to move downward, so that the burette (308) is placed in the standard material vessel (202). The liquid level must immerse the burette (308) and the electrode probe (309) to calibrate the burette (308).

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