Miniature titration experiment device

Abstract

The invention discloses a miniature titration experiment device, and belongs to the technical field of chemical analysis experiments. The miniature titration experiment device comprises a base, an experiment vessel, a lifting adjusting mechanism, a burette arranged on the lifting adjusting mechanism, a liquid level sensor used for detecting the liquid level in the burette, and a titration control mechanism arranged in the burette and used for controlling the titration amount. The liquid level in the burette is monitored in real time through the liquid level sensor, and the titration control mechanism is controlled to perform titration based on a detection value of the liquid level sensor. Wherein the controller controls the control power supply to turn off the current provided by the electromagnetic coil by receiving a detection signal of the conductometer (or pH meter), and the permanent magnet core moves downwards under the action of gravity, so that a tiny gap is formed between the tip of the lower part of the permanent magnet core and a lower liquid outlet of the inner-layer dropper to be closed; the liquid level change value is read and recorded through the liquid level sensor; therefore, automatic titration experiment analysis is realized, and the titration experiment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical analysis experiments, and particularly to a micro titration experimental device. Background Art

[0002] The conventional titration method is a commonly used chemical analysis method. Currently, in laboratories, manual titration is generally adopted for titration analysis. It indicates the titration end point according to the color change of the indicator, and then visually estimates the volume of the standard solution consumed to calculate the analysis result. This way of judging the titration end point through color change and visually determining the consumption of the standard solution is likely to cause inaccurate analysis results. At the same time, this titration method uses a large amount of reagents, is prone to causing pollution, and has a relatively high experimental cost.

[0003] In order to reduce the reagent consumption, reduce pollution and costs, people have developed the micro titration method. The micro titration experiment using the micro titration method is to obtain the required chemical information with as little reagent as possible on the premise of ensuring accuracy as much as possible. Usually, the reagent consumption is only 1 / 10 to 1 / 1000 of that of a conventional experiment. Since the reagent consumption is reduced, the discharge of "three wastes" in the laboratory is reduced. However, the reduction in consumption will inevitably increase the experimental error.

[0004] Therefore, it can be seen that how to provide a micro titration experimental device that can not only reduce the reagent consumption, but also not increase the experimental error and improve the experimental accuracy is a technical problem that needs to be solved in this field at present.

[0005] Among the prior arts, the application number CN201210442290.6 discloses a micro titration experimental device, including an equal-arm lever, a constant weight block arranged at one end of the equal-arm lever, an electronic balance, and a titration device arranged at the other end of the equal-arm lever. The lower part of the constant weight block is connected to the weighing part of the electronic balance. The titration device includes a burette movably connected to the equal-arm lever and a titration container arranged below the burette. For the micro titration experimental device of the present invention, the technical solution of determining the concentration of the solution to be measured by measuring the weight of the titrant with an electronic balance. Since the weighing accuracy of the electronic balance is high and there is no need to visually observe the volume change of the titrant as in the prior art, it can not only reduce the consumption of the titrant, but also improve the experimental accuracy, reduce costs, and reduce the pollution to the environment.

[0006] However, the existing titration devices for experimental analysis are not convenient for automatic titration operations, and the titration operation time is relatively long when dealing with large samples. Summary of the Invention

[0007] The purpose of the present invention is to provide a micro titration experimental device to solve the problem that the conventional micro titration experimental device is not convenient for automatic titration operations.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention provides a micro titration experiment device, including a base, an experimental vessel placed on the base, a lifting and adjusting mechanism arranged on the base, a burette arranged on the lifting and adjusting mechanism, a liquid level sensor for detecting the liquid level in the burette, and a titration control mechanism arranged in the burette for controlling the titration amount.

[0010] In this embodiment, further, a stirring mechanism is arranged above the experimental vessel through an adjusting bracket;

[0011] The adjusting bracket includes a support rod vertically fixed on the base and an adjusting frame locked and limited on the support rod;

[0012] The stirring mechanism includes a stirring motor arranged on the adjusting frame, a stirring shaft drivingly connected to the stirring motor, and a stirring blade arranged at the bottom of the stirring shaft.

[0013] In this embodiment, further, the lifting mechanism includes two support plates arranged up and down, a guide rod connecting the two support plates, a lead screw shaft arranged between the two support plates, a lead screw motor for driving the lead screw shaft to rotate, and a lead screw slider arranged on the guide rod and the lead screw shaft;

[0014] The two ends of the lead screw shaft are respectively arranged on the two support plates through bearings, and the guide rods are symmetrically arranged on both sides of the lead screw shaft; a lead screw nut adapted to the lead screw shaft is arranged in the middle of the lead screw slider, and a guide sleeve adapted to the guide rod is also arranged on the lead screw slider;

[0015] An extended support frame I and an extended support frame II are symmetrically arranged on the lead screw slider.

[0016] In this embodiment, further, a lower support is arranged at the bottom of the lifting mechanism.

[0017] In this embodiment, further, a sleeve is arranged at the end of the extended support frame I, and a burette is limited and arranged in the sleeve;

[0018] The burette includes an inner layer dropper and an outer layer sleeve coaxially sleeved outside the inner layer dropper; wherein a flared liquid inlet is communicated at the top of the inner layer dropper;

[0019] The titration control mechanism includes a permanent magnetic core arranged in the inner layer dropper for blocking its lower liquid discharge port, an electromagnetic coil arranged between the inner layer dropper and the outer layer sleeve, and a control power supply connected to the electromagnetic coil through a power wire;

[0020] An anti-corrosion layer is provided outside the permanent magnet core. A plurality of support ribs that fit the inner wall of the inner layer dropper are integrally formed at the upper end of the anti-corrosion layer; the lower end of the permanent magnet core is a tip structure, and the permanent magnet core is controlled to lift and lower after being energized through the electromagnetic coil.

[0021] In a further embodiment of the present example, a rotating shaft is provided on the extension support frame I. The rotating shaft is adjusted and driven by a servo motor provided at the bottom of the extension support frame I. A rotating arm I and a rotating arm II are provided at the top of the rotating shaft; among them, a liquid injection pipe corresponding to the liquid inlet is provided on the rotating arm I, and a liquid level sensor corresponding to the liquid inlet is provided on the rotating arm II.

[0022] In a further embodiment of the present example, a peristaltic pump is provided on the extension support frame I; wherein the peristaltic pump is connected to a titrant storage tank through a liquid extraction pipe, and the drain pipe of the peristaltic pump is connected to the liquid injection pipe.

[0023] In a further embodiment of the present example, a conductivity meter is further provided in the experimental vessel, and the conductivity meter is connected to a conductivity display through a wire.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are:

[0025] In the present invention, the liquid level in the burette is monitored in real time through the liquid level sensor, and the titration control mechanism is controlled to perform titration based on the detection value of the liquid level sensor. Among them, the controller controls the control power supply to cut off the current provided by the electromagnetic coil by receiving the detection signal of the conductivity meter (or pH meter), and the permanent magnet core moves downward under the action of gravity, so that a small gap is closed between the lower tip of the permanent magnet core and the lower liquid discharge port of the inner layer dropper, and then the liquid level change value is read and recorded through the liquid level sensor; thus realizing automatic titration experiment analysis and improving the efficiency of titration experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the drawings.

[0027] Figure 1 It is a schematic diagram of the main structure of the micro titration experiment device of the present invention;

[0028] Figure 2 It is a schematic diagram of the lifting and adjusting mechanism of the micro titration experiment device of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the burette of the micro titration experiment device of the present invention;

[0030] Figure 4 For Figure 3 The partial enlarged schematic diagram at A in

[0031] Figure 5 For Figure 4 Schematic diagram of cross-section B-B in

[0032] Explanation of reference numerals: 1, base; 11, support rod; 12, adjustment frame; 13, stirring motor; 131, stirring shaft; 132, stirring blade; 2, experimental vessel; 3, lifting mechanism; 31, support plate; 32, lead screw motor; 33, guide rod; 34, lead screw shaft; 35, lead screw slider; 351, extended support frame I; 352, extended support frame II; 36, lower support; 4, peristaltic pump; 41, liquid suction pipe; 42, liquid discharge pipe; 43, flow valve; 5, burette; 51, liquid inlet; 52, electromagnetic coil; 53, permanent magnetic core; 531, corrosion-resistant layer; 54, outer sleeve; 55, inner dropper; 6, control power supply; 61, power supply wire; 7, titrant storage tank; 8, conductivity display; 81, conductometer; 9, servo motor; 91, rotating arm I; 911, liquid injection pipe; 92, rotating arm II; 921, liquid level sensor. Detailed implementation manners

[0033] Referring to Figure 1 , a micro titration experiment device is disclosed in this embodiment, which includes a base 1, an experimental vessel 2 placed on the base 1, a lifting and adjusting mechanism installed on the base 1, a burette 5 installed on the lifting and adjusting mechanism, a liquid level sensor 921 for detecting the liquid level in the burette 5, and a titration control mechanism installed in the burette 5 for controlling the titration volume.

[0034] During the experiment, the liquid level in the burette 5 is monitored in real time by the liquid level sensor 921, and the titration control mechanism is controlled based on the detection value of the liquid level sensor 921 for titration.

[0035] In this embodiment, a stirring mechanism is installed above the experimental vessel 2 through an adjusting bracket; the adjusting bracket includes a support rod 11 vertically fixed on the base 1 and an adjustment frame 12 locked and limited on the support rod 11; the stirring mechanism includes a stirring motor 13 installed on the adjustment frame 12, a stirring shaft 131 drivingly connected to the stirring motor 13, and a stirring blade 132 installed at the bottom of the stirring shaft 131; to accelerate the reaction rate.

[0036] Referring to Figure 1 and Figure 2 , in this embodiment, the lifting mechanism 3 includes two support plates 31 arranged vertically, a guide rod 33 connecting the two support plates 31, a lead screw shaft 34 installed between the two support plates 31, a lead screw motor 32 for driving the lead screw shaft 34 to rotate, and a lead screw slider 35 installed on the guide rod 33 and the lead screw shaft 34.

[0037] Both ends of the lead screw shaft 34 are respectively mounted on the two support plates 31 through bearings, and guide rods 33 are symmetrically mounted on both sides of the lead screw shaft 34; a lead screw nut adapted to the lead screw shaft 34 is mounted in the middle of the lead screw slider 35, and a guide sleeve adapted to the guide rod 33 is also mounted on the lead screw slider 35; an extended support frame I 351 and an extended support frame II 352 are symmetrically mounted on the lead screw slider 35.

[0038] By controlling the lead screw motor 32, the burette 5 mounted on the lifting and adjusting mechanism is driven to approach the liquid level of the experimental vessel 2.

[0039] In this embodiment, a lower support 36 is mounted at the bottom of the lifting mechanism 3. By using the lifting mechanism 3 to lift the position of the lifting mechanism 3, it is convenient for the installation and assembly of the equipment.

[0040] Reference Figure 2 , a sleeve is mounted at the end of the extended support frame I 352, and a burette 5 is limitedly mounted in the sleeve; the burette 5 includes an inner layer dropper 55 and an outer layer sleeve 54 coaxially sleeved outside the inner layer dropper 55; a flared liquid inlet 51 is communicated at the top of the inner layer dropper 55.

[0041] Reference Figure 3 and Figure 4 , the titration control mechanism includes a permanent magnetic core 53 mounted in the inner layer dropper 55 and used to block its lower liquid discharge port, an electromagnetic coil 52 mounted between the inner layer dropper 55 and the outer layer sleeve 54, and a control power supply 6 connected to the electromagnetic coil 52 through a power wire 61; a corrosion-resistant layer 531 is mounted outside the permanent magnetic core 53, and a plurality of support ribs 532 (reference Figure 5 ) that fit the inner wall of the inner layer dropper 55 are integrally formed at the upper end of the corrosion-resistant layer 531; the lower end of the permanent magnetic core 53 is a tip structure, and the permanent magnetic core 53 is controlled to lift after the electromagnetic coil 52 is energized; the current provided by the control power supply 6 to the electromagnetic coil 52 through the power wire 61 needs to be sufficient to lift the permanent magnetic core 53 upward so that a small gap appears between the lower tip of the permanent magnetic core 53 and the lower liquid discharge port of the inner layer dropper 55, and liquid drops flow out into the experimental vessel 2.

[0042] In this embodiment, a conductivity meter 81 (or pH meter) is further installed in the experimental vessel 2. The conductivity meter 81 is connected to a conductivity display 8 through a wire. The conductivity meter 81 (or pH meter) also serves as a sensor. The controller controls the control power supply 6 to turn off the current provided by the electromagnetic coil 52 by receiving the detection signal of the conductivity meter 81 (or pH meter). The permanent magnetic core 53 moves downward under the action of gravity, so that a small gap is closed between the lower tip of the permanent magnetic core 53 and the lower liquid discharge port of the inner dropper 55. Then, the liquid level change value is read and recorded by the liquid level sensor 921.

[0043] Reference Figure 1 and Figure 2 , a rotating shaft is installed on the extended support frame I 352. The rotating shaft is adjusted and driven by a servo motor 9 installed at the bottom of the extended support frame I 352. A rotating arm I 91 and a rotating arm II 92 are installed at the top of the rotating shaft. A liquid injection pipe 911 corresponding to the liquid inlet 51 is installed on the rotating arm I 91, and a liquid level sensor 921 corresponding to the liquid inlet 51 is installed on the rotating arm II 92.

[0044] A peristaltic pump 4 is installed on the extended support frame I 351. The peristaltic pump 4 is connected to a titrant storage tank 7 through a liquid extraction pipe 41, and the liquid discharge pipe 42 of the peristaltic pump 4 is connected to the liquid injection pipe 911. Before titration, the peristaltic pump 4 is used to inject titrant into the inner dropper 55.

[0045] The above embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A micro titration experimental device, characterized in that: The invention comprises a base, a laboratory vessel placed on the base, a lifting and lowering adjustment mechanism arranged on the base, a burette arranged on the lifting and lowering adjustment mechanism, a liquid level sensor for detecting the liquid level in the burette, and a titration control mechanism arranged in the burette for controlling the titration amount.

2. The micro titration experimental device according to claim 1, characterized in that: A stirring mechanism is arranged above the experimental vessel through an adjustable bracket; The adjustment bracket includes a support rod vertically fixed on the base, and an adjustment frame locked and limited on the support rod; The stirring mechanism comprises a stirring motor arranged on the adjusting frame, a stirring shaft drivingly connected to the stirring motor, and a stirring blade arranged at the bottom of the stirring shaft.

3. The micro titration experimental device according to claim 1, characterized in that: The lifting mechanism comprises two support plates arranged at the upper and lower parts, a guide rod connecting the two support plates, a screw shaft arranged between the two support plates, a screw motor driving the screw shaft to rotate, and a screw slide seat arranged on the guide rod and the screw shaft; The two ends of the screw shaft are respectively arranged on the two support plates through bearings, and the guide rods are symmetrically arranged on both sides of the screw shaft; a screw nut adapted to the screw shaft is arranged in the middle of the screw slide, and a guide sleeve adapted to the guide rod is also arranged on the screw slide; An extended support frame I and an extended support frame II are symmetrically arranged on the screw slide.

4. The micro titration experimental device according to claim 3, characterized in that: A lower bracket is arranged at the bottom of the lifting mechanism.

5. The micro titration experimental device according to claim 3, characterized in that: A sleeve is provided at the end of the extended support frame I, and a burette is limitedly provided in the sleeve; The burette comprises an inner layer burette and an outer layer sleeve coaxially sleeved outside the inner layer burette; wherein a flared liquid inlet is connected to the top of the inner layer burette; The titration control mechanism includes a permanent magnetic core arranged in the inner layer dropper and used to block the lower discharge port thereof, an electromagnetic coil arranged between the inner layer dropper and the outer layer sleeve interlayer, and a control power supply connected to the electromagnetic coil through a power supply wire; A corrosion-resistant layer is arranged outside the permanent magnetic core, and a plurality of supporting ribs are integrally formed on the upper end of the corrosion-resistant layer to fit the inner wall of the inner layer dropper; the lower end of the permanent magnetic core is a pointed structure, and the permanent magnetic core is controlled to rise and fall after the electromagnetic coil is energized.

6. The micro titration experimental device according to claim 5, characterized in that: A rotating shaft is arranged on the extended support frame I, and the rotating shaft is adjusted and driven by a servo motor arranged at the bottom of the extended support frame I. A rotating arm I and a rotating arm II are arranged on the top of the rotating shaft; wherein a liquid injection pipe corresponding to the liquid inlet is arranged on the rotating arm I, and a liquid level sensor corresponding to the liquid inlet is arranged on the rotating arm II.

7. The micro titration experimental device according to claim 6, characterized in that: A peristaltic pump is arranged on the extended support frame I; wherein the peristaltic pump is connected to a titration liquid storage tank through a liquid extraction tube, and the discharge tube of the peristaltic pump is connected to the liquid injection tube.

8. The micro titration experimental device according to claim 1, characterized in that: A conductivity meter is also arranged in the experimental vessel, and the conductivity meter is connected to a conductivity display through a wire.

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